Question

The incorrect matched pair is
(A) Cerebal aqueduct- canal that passess through midbrain
(B) Corpora quadrigemina- four rounded swellings present on ventral portion of midbrain
(C) Cerebrum- very convoluted surface
(D) Medulla oblongata- controls gastric secretions

Answer 1

Hint: The brain is the part of the body consisting of three parts; cerebrum, brainstream, and cerebellum. The cerebrum is the largest of all parts involving the right and left hemisphere.

Complete answer: The outer part of the brain is made of cortex, the brain stem is found in between the body and the spinal cord, in the center the basal ganglia are clustered, and cerebellum is at the base and the back of the brain.
The cerebellum is responsible for balance and coordination.
The brain is also divided into different lobes, that includes; the frontal lobe that are responsible for the motor function, the parietal lobe responsible for sensation, body position, and handwriting, the temporal lobe is involved in hearing and memory, and the occipital lobe involved in maintaining the visual system. The cerebral aqueduct acts as a canal that passes through the midbrain and connects the third ventricle and the fourth ventricle of the brain.
The corpora quadrigemina consists of four colliculi that is two inferior and two superior colliculi found on the tectum of the dorsal part of the midbrain. And the cerebral cortex is very convoluted, which means it has many creases and folds that allow the brain to adjust inside the skull.

Now lets us find the solution from the given options:
Cerebral aqueduct – canal that passes through midbrain, this statement is correct as the cerebral aqueduct consists of a canal that connects the third ventricles with the fourth ventricle.
Corpora quadrigemina- four rounded swellings present on the ventral portion of midbrain, this is an incorrect statement as corpora quadrigemina have four colliculi that present in the dorsal part of brain not the ventral part.
Cerebrum- very convoluted surface, this statement is correct as the cerebral cortex of the brain consists of many creases and folds that mean it is highly convoluted so that the brain gets fit inside the skull.
Medulla oblongata- controls gastric secretions; this is a correct statement as medulla oblongata controls gastric secretion through both endocrine system and parasympathetic branch.

Hence, the correct option is (B). Corpora quadrigemina- four rounded swellings present on the ventral portion of the midbrain.


Note: The regions of the midbrain are tectum, tegmentum, cerebral aqueduct, and cerebral peduncles. The midbrain joins the thalamus, hypothalamus, etc that is diencephalon, while caudally it adjoins the medulla, pons, and cerebellum that is the hindbrain.