This document discusses the structure and function of the human brain. It begins by discussing Aristotle's incorrect belief that the heart was the seat of intellect, noting that we now know the brain is responsible for intellect and other higher functions. It then provides details about the major regions of the brain, including the cerebrum and its lobes, white matter, basal ganglia, diencephalon structures like the thalamus and hypothalamus, cerebellum, and cortical areas responsible for motor control, sensory processing, and higher cognitive functions. It also discusses conditions that can affect brain regions like Parkinson's disease.
Hola,
Si necesitan ver más diapositivas del tema, adjuntaré el link de un blog donde pueden encontrar más diapositivas y profundizar más sobre la Anatomía y Fisiología del Sistema Nervioso Central.
http://neuroanatomia-mavc.blogspot.pe/2016/11/fisiologia-y-anatomia-del-sistema-nervioso.html
Kluver bucy syndrome is a very rare cerebral neurological disorder associated with damage to both temporal lobes resulting in abnormalities in memory, social and sexual functioning and idiosyncratic behaviours.
Brain tumors are relatively common with an annual incidence of 9/100000 for primary brain tumors and 8.3 /100000 for metastatic brain tumors.
In India , incidence of primary brain tumor is 3.4 per 100,000 populations for males and 1.2 per 100,000 populations for females
Most brain tumors present with specific neurologic signs due to mass effect. However, in rare cases they may present primarily with psychiatric symptoms.
A study reported that 78% of 530 patients with brain tumors had psychiatric symptoms of which only 18% presented with these symptoms as the first clinical manifestation of a brain tumor.
Due to the neuronal connections of the brain, a lesion in one region may manifest a multitude of symptoms depending on the function of the underlying neuronal foci.
Hola,
Si necesitan ver más diapositivas del tema, adjuntaré el link de un blog donde pueden encontrar más diapositivas y profundizar más sobre la Anatomía y Fisiología del Sistema Nervioso Central.
http://neuroanatomia-mavc.blogspot.pe/2016/11/fisiologia-y-anatomia-del-sistema-nervioso.html
Kluver bucy syndrome is a very rare cerebral neurological disorder associated with damage to both temporal lobes resulting in abnormalities in memory, social and sexual functioning and idiosyncratic behaviours.
Brain tumors are relatively common with an annual incidence of 9/100000 for primary brain tumors and 8.3 /100000 for metastatic brain tumors.
In India , incidence of primary brain tumor is 3.4 per 100,000 populations for males and 1.2 per 100,000 populations for females
Most brain tumors present with specific neurologic signs due to mass effect. However, in rare cases they may present primarily with psychiatric symptoms.
A study reported that 78% of 530 patients with brain tumors had psychiatric symptoms of which only 18% presented with these symptoms as the first clinical manifestation of a brain tumor.
Due to the neuronal connections of the brain, a lesion in one region may manifest a multitude of symptoms depending on the function of the underlying neuronal foci.
Professional air quality monitoring systems provide immediate, on-site data for analysis, compliance, and decision-making.
Monitor common gases, weather parameters, particulates.
Comparing Evolved Extractive Text Summary Scores of Bidirectional Encoder Rep...University of Maribor
Slides from:
11th International Conference on Electrical, Electronics and Computer Engineering (IcETRAN), Niš, 3-6 June 2024
Track: Artificial Intelligence
https://www.etran.rs/2024/en/home-english/
ISI 2024: Application Form (Extended), Exam Date (Out), EligibilitySciAstra
The Indian Statistical Institute (ISI) has extended its application deadline for 2024 admissions to April 2. Known for its excellence in statistics and related fields, ISI offers a range of programs from Bachelor's to Junior Research Fellowships. The admission test is scheduled for May 12, 2024. Eligibility varies by program, generally requiring a background in Mathematics and English for undergraduate courses and specific degrees for postgraduate and research positions. Application fees are ₹1500 for male general category applicants and ₹1000 for females. Applications are open to Indian and OCI candidates.
DERIVATION OF MODIFIED BERNOULLI EQUATION WITH VISCOUS EFFECTS AND TERMINAL V...Wasswaderrick3
In this book, we use conservation of energy techniques on a fluid element to derive the Modified Bernoulli equation of flow with viscous or friction effects. We derive the general equation of flow/ velocity and then from this we derive the Pouiselle flow equation, the transition flow equation and the turbulent flow equation. In the situations where there are no viscous effects , the equation reduces to the Bernoulli equation. From experimental results, we are able to include other terms in the Bernoulli equation. We also look at cases where pressure gradients exist. We use the Modified Bernoulli equation to derive equations of flow rate for pipes of different cross sectional areas connected together. We also extend our techniques of energy conservation to a sphere falling in a viscous medium under the effect of gravity. We demonstrate Stokes equation of terminal velocity and turbulent flow equation. We look at a way of calculating the time taken for a body to fall in a viscous medium. We also look at the general equation of terminal velocity.
This presentation explores a brief idea about the structural and functional attributes of nucleotides, the structure and function of genetic materials along with the impact of UV rays and pH upon them.
ANAMOLOUS SECONDARY GROWTH IN DICOT ROOTS.pptxRASHMI M G
Abnormal or anomalous secondary growth in plants. It defines secondary growth as an increase in plant girth due to vascular cambium or cork cambium. Anomalous secondary growth does not follow the normal pattern of a single vascular cambium producing xylem internally and phloem externally.
Salas, V. (2024) "John of St. Thomas (Poinsot) on the Science of Sacred Theol...Studia Poinsotiana
I Introduction
II Subalternation and Theology
III Theology and Dogmatic Declarations
IV The Mixed Principles of Theology
V Virtual Revelation: The Unity of Theology
VI Theology as a Natural Science
VII Theology’s Certitude
VIII Conclusion
Notes
Bibliography
All the contents are fully attributable to the author, Doctor Victor Salas. Should you wish to get this text republished, get in touch with the author or the editorial committee of the Studia Poinsotiana. Insofar as possible, we will be happy to broker your contact.
Remote Sensing and Computational, Evolutionary, Supercomputing, and Intellige...University of Maribor
Slides from talk:
Aleš Zamuda: Remote Sensing and Computational, Evolutionary, Supercomputing, and Intelligent Systems.
11th International Conference on Electrical, Electronics and Computer Engineering (IcETRAN), Niš, 3-6 June 2024
Inter-Society Networking Panel GRSS/MTT-S/CIS Panel Session: Promoting Connection and Cooperation
https://www.etran.rs/2024/en/home-english/
Travis Hills' Endeavors in Minnesota: Fostering Environmental and Economic Pr...Travis Hills MN
Travis Hills of Minnesota developed a method to convert waste into high-value dry fertilizer, significantly enriching soil quality. By providing farmers with a valuable resource derived from waste, Travis Hills helps enhance farm profitability while promoting environmental stewardship. Travis Hills' sustainable practices lead to cost savings and increased revenue for farmers by improving resource efficiency and reducing waste.
Earliest Galaxies in the JADES Origins Field: Luminosity Function and Cosmic ...Sérgio Sacani
We characterize the earliest galaxy population in the JADES Origins Field (JOF), the deepest
imaging field observed with JWST. We make use of the ancillary Hubble optical images (5 filters
spanning 0.4−0.9µm) and novel JWST images with 14 filters spanning 0.8−5µm, including 7 mediumband filters, and reaching total exposure times of up to 46 hours per filter. We combine all our data
at > 2.3µm to construct an ultradeep image, reaching as deep as ≈ 31.4 AB mag in the stack and
30.3-31.0 AB mag (5σ, r = 0.1” circular aperture) in individual filters. We measure photometric
redshifts and use robust selection criteria to identify a sample of eight galaxy candidates at redshifts
z = 11.5 − 15. These objects show compact half-light radii of R1/2 ∼ 50 − 200pc, stellar masses of
M⋆ ∼ 107−108M⊙, and star-formation rates of SFR ∼ 0.1−1 M⊙ yr−1
. Our search finds no candidates
at 15 < z < 20, placing upper limits at these redshifts. We develop a forward modeling approach to
infer the properties of the evolving luminosity function without binning in redshift or luminosity that
marginalizes over the photometric redshift uncertainty of our candidate galaxies and incorporates the
impact of non-detections. We find a z = 12 luminosity function in good agreement with prior results,
and that the luminosity function normalization and UV luminosity density decline by a factor of ∼ 2.5
from z = 12 to z = 14. We discuss the possible implications of our results in the context of theoretical
models for evolution of the dark matter halo mass function.
Earliest Galaxies in the JADES Origins Field: Luminosity Function and Cosmic ...
Nerve physiology in brain
1. This great Greek
philosopher was
the preeminent
biologist of his day
and he opined that
the heart was the
seat of the intellect.
•Who was he?
•Was he right?
2. Aristotle was WRONG
(about this at least)
• We now attribute intellect ( as well a host of other
functions) to the brain.
– That grayish lump resting w/i the bony cranium
– NAME THE 8 BONES OF THE CRANIUM!
– Weighs about 1600g in ♂ and about 1400g in ♀
– Has about 1012 neurons, each of which may receive as
many as 200,000 synapses – talk about integration!
– Although these numbers connote a high level of
complexity, the CNS is actually quite orderly.
3. Gray and White Matter
• Microscopically, the CNS
contains 2 neural
elements:
– Neuron cell bodies
(clusters are known as
nuclei)
– Nerve fibers (axons) in
bundles called tracts.
• Viewed macroscopically,
CNS tissues can be
distinguished by color:
– Gray matter consists of
somata, dendrites, and
unmyelinated axons.
– White matter consists
primarily of myelinated
axons.
5. Cerebrum
• The largest, most
conspicuous portion of
the brain.
• 2 hemispheres
connected by the corpus
callosum.
• Has an outer cortex of
gray matter surrounding
an interior that is mostly
white matter, except for
a few small portions.
• The surface is marked by
ridges called gyri
separated by grooves
called sulci.
6. • Deeper grooves called fissures separate large regions of the brain.
– The median longitudinal fissure separates the cerebral hemispheres.
– The transverse fissure separates the cerebral hemispheres from the
cerebellum below.
• Deep sulci divide each hemisphere into 5 lobes:
– Frontal, Parietal, Temporal, Occipital, and Insula
– Why/How are the 1st 4 named?
– What does “insular” mean?
7. Lobes of the
Cerebrum
• The central sulcus separates the frontal lobe from the parietal lobe.
– Bordering the central sulcus are 2 important gyri, the precentral gyrus
and the postcentral gyrus.
• The occipital lobe is separated from the parietal lobe by the parieto-
occipital sulcus.
• The lateral sulcus outlines the temporal lobe.
– The insula is buried deep within the lateral sulcus.
9. Cerebrum
• Each cerebral
hemisphere is
divided into 3
regions:
1. Superficial cortex of
gray matter
2. Internal white matter
3. The basal nuclei –
islands of gray matter
found deep within
the white matter
10. Cerebral Cortex
• Allows for sensation,
voluntary movement, self-
awareness,
communication,
recognition, and more.
• Gray matter!
• 40% of brain mass, but
only 2-3 mm thick.
• Each cerebral hemisphere
is concerned with the
sensory and motor
functions of the opposite
side (a.k.a. contralateral
side) of the body.
11. Cerebral Cortex
• 3 types of functional areas:
1. Motor Control voluntary
motor functions
2. Sensory Allow for conscious
recognition of stimuli
3. Association Integration
12. Cortical Motor Areas
1. Primary Motor
Cortex
2. Premotor Cortex
3. Broca’s Area
4. Frontal Eye Field
14. Primary (Somatic) Motor Cortex
• Located in the precentral
gyrus of each cerebral
hemisphere.
• Contains large neurons
(pyramidal cells) which
project to SC neurons
which eventually synapse
on skeletal muscles
– Allowing for voluntary
motor control.
– These pathways are known
as the corticospinal tracts
or pyramidal tracts.
15. Primary (Somatic)
Motor Cortex
• Somatotopy
– The entire body is represented
spatially in the primary motor
cortex, i.e., in one region we have
neurons controlling hand
movements and in another region
leg movements, etc.
• Neurons controlling movement of
different body regions do not
intermingle.
• What does it mean to say that
motor innervation is contralateral?
• Let’s look at the motor
homunculus.
16.
17. Premotor Cortex
• Located just anterior
to the primary motor
cortex.
• Involved in learned or
patterned skills.
• Involved in planning
movements.
• How would damage to
the primary motor
cortex differ from
damage to the
premotor cortex?
18. Broca’s Area
• Typically found in only
one hemisphere (often
the left), anterior to the
inferior portion of the
premotor cortex.
• Directs muscles of tongue,
lips, and throat that are
used in speech production.
• Involved in planning
speech production and
possibly planning other
activities.
19. Frontal Eye Field
• Controls voluntary eye
movements.
• Found in and anterior
to the premotor
cortex, superior to
Broca’s area.
• What muscles would
be affected if this area
was damaged?
20. Sensory Areas
• Found in the parietal, occipital, and
temporal lobes.
1. Primary somatosensory cortex
2. Somatosensory association cortex
3. Visual areas
4. Auditory areas
5. Olfactory cortex
6. Gustatory cortex
7. Vestibular cortex
21.
22. Primary Somatosensory Cortex
• What does “somato” mean?
• Found in the postcentral gyrus.
• Neurons in this cortical area
receive info from sensory
neurons in the skin and from
proprioceptors which monitor
joint position.
• Contralateral input.
• How was the motor
somatotopic map arranged?
– Do you think the somatotopic
map will be identical?
23.
24. Somatosensory Association Cortex
• Found posterior to the
primary somatosensory
cortex and is neurally tied
to it.
• Synthesizes multiple
sensory inputs to create a
complete comprehension
of the object being felt.
– How would damage to this
area differ from damage to
the primary somatosensory
cortex?
25. Primary Visual Cortex
• Found in the posterior
and medial occipital
lobe.
• Largest of the sensory
cortices.
– What does this
suggest?
• Contralateral input.
26. Visual Association Area
• Surrounds the primary
visual cortex.
• Basically vision is the
sensation of bars of
light on our retinal
cells. The primary
visual cortex tells
which cells are being
stimulated and how.
The association area
lets us “see” what
we’re looking at.
27. Auditory Cortex
• Found in the superior
margin of the temporal
lobe, next to the lateral
sulcus.
• Sound waves excite
cochlear receptors in the
inner ear which send info
to the auditory cortex.
• There is also an auditory
association area which
lets us interpret and
remember sounds.
28. Olfactory Cortex
• Found in the frontal lobe
just above the orbits.
• Receptors in the olfactory
epithelium extend through
the cribriform plate and
are excited by the binding
of oderants. They then
send their info to the
olfactory cortex.
• Very much involved in
memory and emotion.
29.
30. Gustatory and Vestibular Cortices
• Gustatory cortex is
involved in taste and is
in the parietal lobe
just deep to the
temporal lobe.
• Vestibular cortex is
involved in balance
and equilibrium and is
in the posterior insula
31.
32. Association
Areas
• Allows for analysis
of sensory input.
• Multiple inputs and
outputs. Why?
1. Prefrontal cortex
2. Language areas
3. General
interpretation area
4. Visceral
association area
33. Prefrontal
Cortex
• Anterior frontal lobes
• Involved in analysis,
cognition, thinking,
personality, conscience, &
much more.
• What would a
frontal lobotomy
result in?
• Look at its
evolution
34. Language Areas• Large area for language
understanding and
production surrounding the
lateral sulcus in the left
(language-dominant)
hemisphere
• Includes:
– Wernicke’s area
understanding
oral/written words
– Broca’s area speech
production
– Lateral prefrontal cortex
language
comprehension and
complex word analysis
– Lateral and ventral
temporal cortex
integrates visual and
auditory stimulate
35. General and Visceral Association Areas
• General area integrates
multiple stimuli into a
single cogent
“understanding of the
situation.”
– Found on only one
hemisphere – typically left.
– Contained by 3 lobes:
temporal, occipital, and
parietal.
• Visceral association area
is involved in perception
of visceral sensations
(such as disgust).
– Located in insular cortex
36. Lateralization
• The fact that certain activities are the
almost exclusive domain of one of the 2
hemispheres.
• In most people, the left hemisphere has a more control
over language, math, and logic.
• While the right hemisphere is geared towards musical,
artistic and other creative endeavors.
• Most individuals with left cerebral dominance are right-
handed.
37.
38. Cerebral White Matter
• Is white matter involved
in communication?
• 3 types of fibers:
1. Commissural – connect
corresponding areas of
the 2 hemispheres.
Largest is the corpus
callosum.
2. Association fibers –
connect different parts of
the same hemisphere
3. Projection fibers – fibers
entering and leaving the
cerebral hemispheres
from/to lower structures
39.
40. Basal Nuclei
• Components of the extrapyramidal system which provides
subconscious control of skeletal muscle tone and coordinates
learned movement patterns and other somatic motor activities.
• Doesn’t initiate movements but once movement is underway,
they assist in the pattern and rhythm (especially for trunk and
proximal limb muscles
• Set of nuclei deep within the
white matter.
• Includes the:
– Caudate Nucleus
– Lentiform Nucleus
• Globus pallidus
• Putamen
41. Basal Nuclei
• Info arrives at the caudate nucleus and the putamen from
sensory, motor, and association areas of the cortex.
• Processing and integration occurs w/i the nuclei and then info
is sent from the globus pallidus to the motor cortex via the
thalamus.
• The basal nuclei alter motor commands issued by the cerebral
cortex via this feedback loop.
42. Parkinson’s Disease
• Each side of the midbrain contains a nucleus called the
substantia nigra.
• Neurons in the substantia nigra inhibit the activity of basal
nuclei by releasing dopamine.
Damage to SN
neurons
Decrease in
dopamine secretion
Increased activity of
basal nuclei
Gradual increase in
muscle tone
Appearance of symptoms of
Parkinson’s disease: tremor, slow
movement, inability to move, rigid
gait, reduced facial expression
43. Diencephalon
• Forms the
central core of
the forebrain
• 3 paired
structures:
1. Thalamus
2. Hypothalamus
3. Epithalamus
All 3 are gray matter
44.
45. Thalamus
• 80% of the diencephalon
• Sensory relay station
where sensory signals can
be edited, sorted, and
routed.
• Also has profound input
on motor (via the basal
ganglia and cerebellum)
and cognitive function.
• Not all functions have
been elucidated.
46. Hypothalamus
• Functions:
– Autonomic regulatory center
• Influences HR, BP, resp. rate,
GI motility, pupillary diameter.
• Can you hold your
breath until you die?
– Emotional response
• Involved in fear, loathing, pleasure
• Drive center: sex, hunger
– Regulation of body temperature
– Regulation of food intake
• Contains a satiety center
– Regulation of water balance and thirst
– Regulation of sleep/wake cycles
– Hormonal control
• Releases hormones that influence hormonal
secretion from the anterior pituitary gland.
• Releases oxytocin and vasopressin
48. Epithalamus
• Above the thalamus
• Contains the pineal gland
which releases melatonin
(involved in sleep/wake
cycle and mood).
• Contains a structure called
the habenula – involved in
food and water intake
49. Cerebellum
• Lies inferior to the cerebrum and
occupies the posterior cranial fossa.
• 2nd largest region of the brain.
• 10% of the brain by volume, but it
contains 50% of its neurons
• Has 2 primary functions:
1. Adjusting the postural muscles of the body
• Coordinates rapid, automatic adjustments, that maintain balance and
equilibrium
2. Programming and fine-tuning movements controlled at the
subconscious and conscious levels
• Refines learned movement patterns by regulating activity of both the
pyramidal and extrapyarmidal motor pathways of the cerebral cortex
• Compares motor commands with sensory info from muscles and joints
and performs any adjustments to make the movement smooth
50. Do you see the cerebellum?
What else can you see?
51.
52. Cerebellum
• Has a complex,
convoluted cortical
surface with multiple folds
(folia) which are less
prominent than the gyri of
the cerebrum.
• Has anterior and posterior
lobes separated by the
primary fissure.
• Along the midline, a
narrow band of cortex
called the vermis
separates the cerebellar
hemispheres.
• The floccunodular lobe
lies anterior to the vermis
and btwn the cerebellar
hemispheres.
53. Cerebellum
• Cerebellar cortex contains
huge, highly branched
Purkinje cells whose
extensive dendrites can
receive up to 200,000
synapses.
• Internally, the white
matter forms a branching
array that in a sectional
view resembles a tree –
for this reason, it’s
called the arbor vitae
54. Cerebellum
• Tracts that link the cerebellum w/ the
brain stem, cerebrum, and spinal cord
leave the cerebellar hemispheres as the
superior, middle, and inferior cerebellar
peduncles.
– SCP carries instructions from cerebellar
nuclei to the cerebral cortex via midbrain
and thalamus
– MCP connects pontine nuclei to the
cerebellum. This info ultimately came from
the cerebral cortex and informs the
cerebellum of voluntary motor activities
– ICP connects the cerebellum and the
medulla oblongata and carries sensory
information from muscles and from the
vestibular apparatus of the inner ear.
55. Cerebellum
• The cerebellum can be
permanently damaged
by trauma or stroke or
temporarily affected
by drugs such as
alcohol.
• These alterations can
produce ataxia – a
disturbance in balance.