Question

Which of the following structures is related to vision in rabbits?
(a) Hippocampus
(b) Corpus Albicans
(c) Corpus callosum
(d) Corpora quadrigemina

Answer 1

Hint: The structures related to vision in rabbits are located in the upper or superior surfaces of the midbrain. Midbrain relay impulses back and forth between the cerebrum of the forebrain to the cerebellum and pons region of the hindbrain.

Complete answer:
Midbrain is a very small constricted portion of the brain which is covered by the cerebrum of the forebrain in mammals like rabbits. The four lobes or optic lobes in the midbrain are collectively referred to as corpora quadrigemina in which the superior two lobes are related to the optical activity while the two posterior lobes are associated with the hearing functions.
- Hypothalamus is a small region located at the base of the brain. It contains reflex centers linked to the autonomic nervous system. It is a center of thermoregulation i.e regulates temperature or homeostasis. It also controls sleeping patterns and wakefulness.
- Corpus Albicans is a structure found in the ovary of females. After ovulation i.e release of a secondary oocyte from the Graafian follicle, its remnants from the corpus luteum. It produces hormones like progesterone, estrogens for implantation. In case, fertilization does not occur, the corpus luteum degenerates into a fibrous scar tissue called corpus Albicans.
- The cerebrum of the forebrain is divided into two cerebral hemispheres. These two hemispheres are linked by a nerve of mass fibers called the corpus callosum.
So, the correct answer is ‘Corpora quadrigemina.’

Note:
- The cerebrum is further divided into four lobes: Frontal Lobe, Parietal Lobe, Temporal Lobe, Occipital lobe.
- The frontal lobe is responsible for the voluntary movements and decision- making ability of an individual. The parietal lobe processes sensory information regarding pain, taste, or touch, etc. The temporal lobe deals with memory, auditory information, language, speech, smell, and emotion. The occipital lobe processes visual information, shape, and color.