Question

Which one of the following is not a part of the brain stem?
(A) Cerebrum
(B) Corpora quadrigemina
(C) Medulla oblongata
(D) Pons varoli

Answer 1

Hint: The brain is the central organ for the nervous system in the human and the other organisms. It includes the part of cerebrum, cerebellum and the brain stem. The brainstem is also known as truncus encephali and this structure is found between the medulla oblongata and the spinal cord.

Complete answer:
The brainstem includes the parts like midbrain, varoli, medulla oblongata and the spinal cord. The midbrain is also known as mesencephalon. It is the most complex structure of the brain stem and it has both the white and the grey matter in it. The varoli is also called pons and it is the largest part of the brain stem.
It is located just below the midbrain. It mainly deals with the facial adjustments. Medulla is the part that connects both the brain and the spinal cord. It maintains the breathing, blood flow etc. The corpora quadrigemina is the part which is located at the midbrain and is the smallest part which contains the superior and the inferior lobes. Apart from the other options, the cerebrum is the part of the forebrain and not the part of the brain stem.

Hence the correct answer is option(A)

Note: The main function of the brain stem is to help in the process of sleeping, vision, hearing, control of the body temperature and the attention. This brain stem functions in the controlling of the muscle tension and maintains the position of the body.