POWER POINT PRESENTATION

1. WELCOME
NAME : sheena s
REG.NO : 18114386017
OPTION :NATURAL SCIENCE
CONCEPT : PARTS OF THE
BRAIN
TOPIC :BRAIN
St Thomas training college
BRAIN
Brain is the central information processing organ of our body, and acts as the “command and
control system”.
• The human brain is well protected inside the cranium. The brain is covered by three
layers called meninges.
• It protects the brain provides nutrients and oxygen to brain tissues through their
capillaries. Cerebro spinal fluid (csf) is filled the cavity between layers of meninges
PARTS OF THE HUMAN BRAIN

2. STRUCTURE OF HUMAN
BRAIN
 An adult human brain weighs about 1350 gm of their body weight
 It attains its full size at the age of 6 years
 It is well protected in the cranial cavity
 In most part of the brain, the grey matter forms the surface while the white
matter is located deep in the brain.
The brain has three primary divisions; fore brain, mid brain and hind brain.
1 . FORE BRAIN
The anterior most part of the brain is called the fore brain.
The main parts of the fore brain are the cerebrum, thalamus and
hypothalamus
a).CEREBRUM
 Cerebrum is the largest part of the brain.
There are convolutions on the surface of the cerebrum.
 A deep cleft called longitudinal fissure divides the entire
cerebrum into two large hemispheres called cerebral
hemispheres.
 The two cerebral hemispheres are held together and connected b
y a curved ,thick band of nerve fibres, known as the corpus
callosum.
 Cerebral cortex is the outer layer of the cerebrum.

3. 
THALAMUS AND HYPOTHALAMUS
a).THALAMUS
 The cerebrum wraps around a structure called thalamus
 It is a major co-ordinating centre for sensory and motor signals.
b).HYPOTHALAMUS
Another very important part of the brain called hypothalamus lies at the
base of the thalamus.
It is relatively small with just 4 gm in weight.
It is highly vascularised.
It contains number of nerve centres which control body temperature, urge
for eating and drinking.
It also contains several group of neurosecretory cells
2.MID BRAIN

4.  It is located between the thalamus or hypothalamus of the fore
brain and pons of the hind.
 The mid brain of human consists of 2 parts corpora quadrigemina
and crura cerebri
Four lobes of round masses (swellings) of neural tissue found on the
dorsal region of the mid brain are called corpora quadrigemina
The 2 bundles of nerve fibres found on the ventral side of the mid brain
are called crura cerebri
Mid brain and hind brain from the brain stem
3.HIND BRAIN
 The posterior part of the brain is called hind brain
 It consist of 3 regions-pons,cerebellum and medulla
 a)PONS VEROLI
 It forms the floor of the brain stem
 Pons varoli is a bridge between two cerebellar
hemispheres.

5.  It is chiefly concerd with co-ordination of activities of eye
and ear.
 It relays information between cerebrum and cerebellum
b).CEREBELLUM
 It is the second largest part of the brain.
 It is formed of two small lobes lying on the dorsal side of the hind
brain.
 Like the cerebrum, the cerebellum has and outer cortex
c)MEDULLA OBLONGATA
 The most posterior part of the brain is the medulla oblongata.
 It contains several centers which regulate respiration, heart-
beat,circulation and other cardio-vascular activities.
 Injury to medulla leads to sudden death

6. THANK YOU

7. THANK YOU