explain in detail the structure of brain?
Answers
Answer:
cytoplasm , nerve cells
Answer:
Brain is the main coordinating centre of the body. It is well protected by the skull. It is externally surrounded by three layers, together known as meninges. The tough outer layer is dura mater, a very thin middle layer is arachnoid and smooth inner layer is called pia mater. The brain is divided into three major parts: forebrain, midbrain and hindbrain.
Forebrain: It consists of cerebrum, thalamus, and hypothalamus.
(i) Cerebrum is the largest part of the brain and is divided into two cerebral hemispheres by cerebral fissure. It has four lobes/ functional areas- frontal, lateral, parietal and temporal.
(ii) Thalamus is the main centre of coordination for sensory and motor signalling.
(iii) Hypothalamus lies at the base of thalamus. It secretes ADH and oxytocin. It is the centre for thirst, hunger, love, affection.
Midbrain: It is located between the thalamus region of the forebrain and pons
Region of hindbrain. It consists of two parts- optic lobes and cerebral peduncle. It is concerned with the sense of sight and hearing.
Hindbrain: It consists of three regions- cerebellum, pons and medulla oblongata.
(i) Cerebellum is the second largest part of the brain. It is responsible for maintaining posture and equilibrium of the body.
(ii) Pons is a band of nerve fibre that lies between medulla oblongata and midbrain. It connects the lateral parts of cerebellar hemisphere together.
(iii) Medulla oblongata is the posterior part of the brain. It is located beneath the cerebellum and extends to form the spinal cord.
Explanation: