Question

Cavity of medulla oblongata is also known as
(A)Mesocoel
(B)Metacoel
(C)Paracoel
(D)Myelocoel

Answer 1

Hint: The cavity of medulla oblongata is also known as Ventricle IV and it is present between the medulla and pons region of the cerebellum. and brainstem. It is the caudal part of the fourth ventricle of the brain.

Complete answer:
Cavity of medulla oblongata is also known as Metacoel. Ventricles number I and II of cerebral hemispheres are called paracoels or lateral ventricles. Ventricle number III is known as diocoel and last Ventricle number IV is known as the metacoel.

Additional Information: The medulla oblongata plays an important role in the transmission of signals between the spinal cord and the higher parts of the brain and in controlling autonomic activities, such as the heartbeat and external respiration process. The medulla oblongata develops from the ectoderm. It is the lowest part of the brain and the lowest portion of the brain stem also. The brainstem is also part of the brain.
Once an embryo is formed with three known germ layers which are endoderm, mesoderm, and ectoderm, differentiation begins among these three layers. Within the ectoderm, the process of transformation of the neural plate into the neural tube begins, which results in the formation of the neural tube, neural crest cells, and the epidermis. The neural tube cells further give rise to the central nervous system, neural crest cells, peripheral and enteric nervous system. The Medulla oblongata is part of the central nervous system of the body.
So, the correct answer is ‘Metacoel’.

Note: The medulla or medulla oblongata develops from the secondary brain vesicle which is one of the 5 vesicles formed during embryo development called the myelencephalon. The myelencephalon, is formed from the earlier primary brain vesicle, rhombencephalon, which in turn is formed from the neural tube, and therefore it is ectodermal in origin.