Question

Corpora quadrigemina act as the centres for—
A. Audio and vision
B. Olfaction and gustation
C. Thermoregulation and chemical sense
D. None of the above

Answer 1

Hint: It is a part of midbrain. It lies on the dorsal surface. It acts as a connecting link between the forebrain and hindbrain.

Complete answer:
Corpora quadrigemina is a part of the brain. It has four colliculi— two inferior and two superior. It is located on the dorsal surface of the midbrain. These act as reflex centres for hearing and vision. It contains grey matter scattered in the white matter. It lies in the midbrain and acts as a connecting link between the forebrain and hindbrain. It involves responses to the movement of the eyes. The superior segments are called superior colliculi and the inferior are called inferior colliculi. Both together are known as tectum or tectal plate. The superior has a major role in vision. The visual includes— scanning of the paper during reading, covering the eyes when exposed to extreme bright light, sudden turn of head to a sudden stimuli. The inferior has a major role in the hearing.
Each segment has numerous never bundles involved. The one that establishes the link between superior segments is called superior brachium. It establishes the link between the superior segments, optic tract and geniculate body.
The branch that establishes the link between inferior segments is called inferior brachium. It establishes the link between medial geniculate bodies. This further connects to the auditory cortex. These contain geniculate bodies which are the receptors for vision and hearing.

The correct answer is A i.e audio and vision.

Note: Corpora quadrigemina has four colliculi. The superior segments are involved in vision. The inferior segments are involved in hearing.These segments together are known as tectum.