Question

Vermis is
A) A tiny worm
B) Cavity of medulla
C) The large median lobe of cerebellum in mammals
D) A portion of midbrain

Answer 1

Hint: Between the two hemispheres of the cerebellum the narrow middle zone. The superior vermis is the portion projecting above the level of the hemispheres on the upper surface and the inferior vermis is the lower portion, sunken between the two hemispheres and forming the floor of the vallecula.

Complete Answer:
- A tiny worm:Threadworms are tiny. very thin white worms up to 13mm long. It can live in the intestine and around the anus. They are also called pinworms. They look like small threads of white cotton. It is not in the vermis category. Hence option A is incorrect.

- Cavity of medulla:The medullary cavity is the central cavity of the bones cavity where red and yellow bone marrow is stored. It is also known as the marrow cavity. It is located in the main shaft of a long bone. The medullary cavity has walls composed of cancellous bone and it is lined with a thin, vascular membrane. Hence option B is incorrect.

- The large median lobe of cerebellum in mammals:The cerebellum is made up of two lateral lobe and a large vermis lobe. It is divided into nine segments. It is associated with the fastigial nucleus. It is concerned with the regulation of the regulation of the muscle tone for posture and locomotion. Hence option C is correct.

- A portion of midbrain:The midbrain is the topmost part of the brainstem. It is the connection central between the brain and the spinal cord. There are three main parts of the midbrain. The midbrain or mesencephalon is a portion of the central nervous system It is associated with vision, hearing, sleep and wake cycles, and temperature regulation. Hence option D is incorrect.

Hence option C:The large median lobe of cerebellum in mammals is the correct answer.

Note: Vermis is the rounded and elongated central part of the cerebellum, between the two hemispheres. In the medial, cortico-nuclear zone of the cerebellum the cerebellum vermis is located, which is in the posterior fossa of the cranium.