Question

structure of human brain, its parts and function of each part​

Answer 1

Answer:

The brain has three main parts: the cerebrum, cerebellum and brainstem. Cerebrum: is the largest part of the brain and is composed of right and left hemispheres. ... Cerebellum: is located under the cerebrum. Its function is to coordinate muscle movements, maintain posture, and balance.

Explanation:

Answer 2

Answer:

The Brain:-

• In proportion to the size of the body, the human brain is the largest among animals.
• The brain is a very delicate organ well protected inside the brain box or cranium of the skull.
• The adult brain weighs about 1.35 Kg and constitutes about 2% of the total body weight. It is 80% water and consumes more than 25% of the total oxygen taken into the body.

Coverings(Meninges):-

• The brain is protected by 3 membranous coverings called meninges (meninx: membrane) which continue backwards on the spinal cord.

(i) Dura mater: the outermost tough fibrous membrane (dura: tough, mater: mother)

(ii) Arachnoid: the thin delicate middle layer giving a web-like cusion (arachne: spider)

(iii) Pia mater: the innermost highly vascular membrane, richly supplied with blood (pia: tender).

• Meningitis is the inflammation of the meninges.

The space between the covering membranes is filled with a watery fluid-cerebrospinal fluid which acts like a cushion to protect the brain from shocks. The same fluid also fills the central (ventricles) of the brain and the central canal of the spinal cord.

Parts of the Brain:-

The brain has three main parts visible externally,

1. cerebrum
2. cerebellum, and the
3. medulla oblongata.

Here, are the main functions of these parts:-

Cerebrum:

• The highly developed cortex (gray matter) enables us to think, reason out, invent, plan and memorize. Overall, the cerebrum is the seat of intelligence, consciousness and will power. It controls all voluntary actions.

Cerebellum:

• The main function of the cerebellum is to maintain the balance of the body and coordinate muscular activity. The impulse for performing a muscular act, originates in the cerebrum and not in the cerebellum. For example, if you stand up and walk, the impulse for this activity arises in the cerebrum (conscious part). The act of walking involves coordinated working of many muscles. Proper coordination and timing of their contraction and relaxation is the responsibility of the cerebellum.

Medulla oblongata:

• The medulla oblongata is the lowest portion of the brain located at the base of the skull. It is roughly triangular and is continued behind as the spinal cord. Its function is to control the activities of the internal organs, for example, peristaltic movement of the alimentary canal, movement of breathing, beating of the heart, and many other involuntary actions. Injury to the medulla generally results in death.