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Central Nervous System
Organization What are the 3 general functions of the CNS and PNS? Collect information (receptors) Process and Evaluate Information Respond to information How do neurons communicate with each other? action potential propagation and neurotransmitter release
Sensory Division List and define the 2 subdivisions of he sensory division of the nervous system? Somatic sensory touch, pain, pressure, vibration, temperature, proprioception, and special senses Visceral sensory blood vessels and viscera-temperature and stretch Is “visceral sensory” part of autonomic system? Why or why not?
Motor Division List and define the 2 subdivisions of he motor division of the nervous system? Somatic motor CNS to skeletal muscles Voluntary Autonomic motor CNS to smooth muscle, cardiac muscle and glands Involuntary
We see the posterior root is sensory & anterior root is motor. Do they stay separate like this?
Nervous tissue cells of the CNS Flash cards only give us the following:  Glial cells, which are supportive Neurons, which are excitable
Relate these structures
3-week old embryo This process of forming a nervous system is called “_____” The nervous system arises from which germ layer?
Do you recall? In order for neurulation to occur there must already be 3 germ layers. Do you recall what the process was for making 3 germ layers? Gastrulation! It resulted in ectoderm, mesoderm, and endoderm
Development During the development of the nervous system, what longitudinal indentation forms from the neural plate? Neural groove During the development of the nervous system, what hollow structure is formed as the neural folds meet? Neural tube
Development What is the thickened portion of tissue over the notochord called? Neural plate
What becomes of the notochord?
Side note (not in flash cards) Neurons grow until they reach their target organ and form a synapse. If they don’t reach the target they die (apoptosis). Even after neuromuscular connections are made, some are eliminated until each muscle fiber is innervated by only one motor neuron. For example, 20,000 motor neurons are formed in the spinal cord of the chick but ~half die.
How many neurons make up the CNS? 100 billion (mostly in brain) What is the average volume of the human brain? 1200 cc Size matters not—you are ALL brilliant and possess the most complex machine in the known universe
Brain Tissue Organization What is the superficial sheet of gray matter covering most of the adult brain? Cortex Cerebral and Cerebellar Within the interior of the brain, what are clusters of gray matter? Cerebral nuclei
Discuss the dural septa
Name passages between ventricles How does CSF leave the brain? How is CSF drained?
Cerebrum What are the functions of the cerebrum? Intelligence Reasoning Sensory perception Thought Memory Judgment Voluntary motor, visual, and auditory fcns
Cerebral Hemispheres 3 points about the cerebral hemispheres 1) it is usually difficult to assign a precise function to a specific region 2) Usually the hemisphere receives information from and sends motor commands to the opposite side of the body 3) The hemispheres display functional differences (lateralization)
Lobes of the Cerebrum List the primary functions of the frontal lobe. Voluntary motor functions Concentration Verbal communication Decision making Planning Personality
Lobes of the Cerebrum What are the functions of the lobe of the cerebrum that forms the superoposterior part of each cerebral hemisphere (Parietal)? General sensory functions E.g. evaluating shape and texture Understanding language Shares Wernike’s with Temporal lobe
Lobes of the Cerebrum What are the functions of the lobe of the cerebrum that lies inferior to the lateral sulcus (Temporal)? Hearing and smell Interpretation and storage
Lobes of the Cerebrum What are the functions of the lobe of the cerebrum that forms the most posterior region of each cerebral hemisphere (Occipital)? Perceive visual information Store and use visual memories
Lobes of the Cerebrum What are the apparent functions of the small, deep lobe of each cerebral hemisphere lies deep to the lateral sulcus (Insula)? Memory Taste interpretation
Functional Areas of the Cerebrum The primary motor cortex is located within what structure of the brain? Precentral gyrus of the frontal lobe
Note motor speech area & frontal eye field in the frontal lobe
Functional Areas of the Cerebrum What is the function of the association areas within the cerebrum? Integrate new sensory inputs with memories
Note auditory association area & visual association area
Cerebral White Matter What are bundles of myelinated axons that lie deep to the cerebral cortex? Tracts Projection (linking cerebrum to lower brain structures) Association (linking multiple places in cerebrum, but on one side or the other) Commissural  (linking similar parts on the two hemispheres)
Association tracts stay within a hemisphere
Note nuclei also
Diencephalon What part of the brain is composed of the epithalamus, right and left thalami, and the hypothalamus? Diencephalon
Diencephalon What is the function of the thalamus? Final relay for sensory information projected to the primary sensory cortex  Filter sensory information Inform cerebrum where sensory information is coming from
Diencephalon What are the functions of the hypothalamus? Master control of ANS Master control of endocrine system Regulate temperature Control emotional behavior Control food intake Control water intake Regulate sleep/wake cycles
Oxytocin ADH
Brainstem What 3 regions form the brainstem? Midbrain Pons Medulla oblongata
Mesencephalon Within the midbrain what are the motor tracts located on the anterolateral surfaces? Cerebral peduncles Within the midbrain what is the “body of 4 twins”? Corpora quadrigemina
Mesencephalon What are the “visual reflex centers” of the midbrain? Superior colliculi What are the “auditory reflex centers” of the midbrain? Inferior colliculi
Cerebellum What is the function of the cerebellum? Coordinate (and fine tune) skeletal muscle movements Maintain equilibrium and posture
Cerebellum What thick tracts connect the cerebellum to the brainstem? Cerebellar peduncles Superior to mesencephalon Middle to pons Inferior to medulla oblongata
Central Nervous System
Central Nervous System
Central Nervous System

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Central Nervous System

  • 2. Organization What are the 3 general functions of the CNS and PNS? Collect information (receptors) Process and Evaluate Information Respond to information How do neurons communicate with each other? action potential propagation and neurotransmitter release
  • 3. Sensory Division List and define the 2 subdivisions of he sensory division of the nervous system? Somatic sensory touch, pain, pressure, vibration, temperature, proprioception, and special senses Visceral sensory blood vessels and viscera-temperature and stretch Is “visceral sensory” part of autonomic system? Why or why not?
  • 4. Motor Division List and define the 2 subdivisions of he motor division of the nervous system? Somatic motor CNS to skeletal muscles Voluntary Autonomic motor CNS to smooth muscle, cardiac muscle and glands Involuntary
  • 5. We see the posterior root is sensory & anterior root is motor. Do they stay separate like this?
  • 6. Nervous tissue cells of the CNS Flash cards only give us the following: Glial cells, which are supportive Neurons, which are excitable
  • 8. 3-week old embryo This process of forming a nervous system is called “_____” The nervous system arises from which germ layer?
  • 9. Do you recall? In order for neurulation to occur there must already be 3 germ layers. Do you recall what the process was for making 3 germ layers? Gastrulation! It resulted in ectoderm, mesoderm, and endoderm
  • 10. Development During the development of the nervous system, what longitudinal indentation forms from the neural plate? Neural groove During the development of the nervous system, what hollow structure is formed as the neural folds meet? Neural tube
  • 11. Development What is the thickened portion of tissue over the notochord called? Neural plate
  • 12.
  • 13. What becomes of the notochord?
  • 14. Side note (not in flash cards) Neurons grow until they reach their target organ and form a synapse. If they don’t reach the target they die (apoptosis). Even after neuromuscular connections are made, some are eliminated until each muscle fiber is innervated by only one motor neuron. For example, 20,000 motor neurons are formed in the spinal cord of the chick but ~half die.
  • 15.
  • 16. How many neurons make up the CNS? 100 billion (mostly in brain) What is the average volume of the human brain? 1200 cc Size matters not—you are ALL brilliant and possess the most complex machine in the known universe
  • 17. Brain Tissue Organization What is the superficial sheet of gray matter covering most of the adult brain? Cortex Cerebral and Cerebellar Within the interior of the brain, what are clusters of gray matter? Cerebral nuclei
  • 18.
  • 19.
  • 21. Name passages between ventricles How does CSF leave the brain? How is CSF drained?
  • 22.
  • 23. Cerebrum What are the functions of the cerebrum? Intelligence Reasoning Sensory perception Thought Memory Judgment Voluntary motor, visual, and auditory fcns
  • 24. Cerebral Hemispheres 3 points about the cerebral hemispheres 1) it is usually difficult to assign a precise function to a specific region 2) Usually the hemisphere receives information from and sends motor commands to the opposite side of the body 3) The hemispheres display functional differences (lateralization)
  • 25.
  • 26. Lobes of the Cerebrum List the primary functions of the frontal lobe. Voluntary motor functions Concentration Verbal communication Decision making Planning Personality
  • 27. Lobes of the Cerebrum What are the functions of the lobe of the cerebrum that forms the superoposterior part of each cerebral hemisphere (Parietal)? General sensory functions E.g. evaluating shape and texture Understanding language Shares Wernike’s with Temporal lobe
  • 28. Lobes of the Cerebrum What are the functions of the lobe of the cerebrum that lies inferior to the lateral sulcus (Temporal)? Hearing and smell Interpretation and storage
  • 29. Lobes of the Cerebrum What are the functions of the lobe of the cerebrum that forms the most posterior region of each cerebral hemisphere (Occipital)? Perceive visual information Store and use visual memories
  • 30. Lobes of the Cerebrum What are the apparent functions of the small, deep lobe of each cerebral hemisphere lies deep to the lateral sulcus (Insula)? Memory Taste interpretation
  • 31. Functional Areas of the Cerebrum The primary motor cortex is located within what structure of the brain? Precentral gyrus of the frontal lobe
  • 32.
  • 33. Note motor speech area & frontal eye field in the frontal lobe
  • 34. Functional Areas of the Cerebrum What is the function of the association areas within the cerebrum? Integrate new sensory inputs with memories
  • 35. Note auditory association area & visual association area
  • 36. Cerebral White Matter What are bundles of myelinated axons that lie deep to the cerebral cortex? Tracts Projection (linking cerebrum to lower brain structures) Association (linking multiple places in cerebrum, but on one side or the other) Commissural (linking similar parts on the two hemispheres)
  • 37. Association tracts stay within a hemisphere
  • 39. Diencephalon What part of the brain is composed of the epithalamus, right and left thalami, and the hypothalamus? Diencephalon
  • 40. Diencephalon What is the function of the thalamus? Final relay for sensory information projected to the primary sensory cortex Filter sensory information Inform cerebrum where sensory information is coming from
  • 41.
  • 42. Diencephalon What are the functions of the hypothalamus? Master control of ANS Master control of endocrine system Regulate temperature Control emotional behavior Control food intake Control water intake Regulate sleep/wake cycles
  • 44.
  • 45. Brainstem What 3 regions form the brainstem? Midbrain Pons Medulla oblongata
  • 46.
  • 47.
  • 48. Mesencephalon Within the midbrain what are the motor tracts located on the anterolateral surfaces? Cerebral peduncles Within the midbrain what is the “body of 4 twins”? Corpora quadrigemina
  • 49. Mesencephalon What are the “visual reflex centers” of the midbrain? Superior colliculi What are the “auditory reflex centers” of the midbrain? Inferior colliculi
  • 50.
  • 51. Cerebellum What is the function of the cerebellum? Coordinate (and fine tune) skeletal muscle movements Maintain equilibrium and posture
  • 52. Cerebellum What thick tracts connect the cerebellum to the brainstem? Cerebellar peduncles Superior to mesencephalon Middle to pons Inferior to medulla oblongata