POWERPOINT PRESENTATION

ONSTRUCTURE OF BRAIN

SREELEKSHMI G

NATURAL SCIENCEREG. NO: 18114375018

MILLATH COLLEGE OF TEACHER EDUCATION

SOORANADU

STRUCTURE OF BRAINBrain 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 HUMAN BRAIN

STRUCTURE OF HUMAN BRAIN

An adult human brain weighs about 1350gm 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.

FORE BRAINThe 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) CerebrumCerebrum 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 by a curves thick band of nerve fibers, known as the corpus collosum, cerebral cortex is the outer layer of the cerebrum.

Thalamus and HypothalamusA) Thalamus

The cerebrum wraps around a structure called thalamus. It is a major coordinating centre for sensory and motor signals.

B) Hypothalamusanother very important part of the brain called hypothalamus lies at the base of the thalamus. It is relatively small with just 4gm weight. It is highly vascularized. It contains number of nerve centre's which control body temperature , urge for eating and drinking. It also contains several group of neurosecretory cells.

MID BRAIN

It is located between the thalamus or hypothalamus of the forebrain and Pons of the hind. The mid brain of human consists of two 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 fibers found on the ventral side of the midbrain are called Crura Cerebri. Mid brain and hind brain from the brain stem.

HINDBRAIN

The posterior part of the brain is called hind brain. It consists of 3 region Pons, cerebellum and medulla.

A) Pons Veroli It forms the floor of the brain stem. Pons veroli is a bridge between two cerebellar hemispheres. It is chiefly concerned with coordination 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 an 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.

THANKS FOR WATCHING