Question

Which of the following brain structure is not considered to be a part of the limbic system
A. Amygdala
B. Hippocampus
C. Corpora quadrigemina
D. Septal nuclei

Answer 1

The word limbic is derived from the Latin word limbus. The limbic system is also known as the paleomammalian cortex involves brain structures that are located on either side of the thalamus primarily in the forebrain.

Complete Answer:
- The limbic system is known to regulate visceral autonomic processes and thus is made up of various structures. These include- cortical areas, subcortical areas and diencephalic structures. These structures themselves are made up of different parts.
- The cortical area contains the limbic lobe, orbitofrontal cortex, piriform cortex, entorhinal cortex, hippocampus and fornix. The subcortical areas include septal nuclei, amygdala and nucleus accumbens.
- The diencephalic structures include hypothalamus, mammillary bodies and anterior nuclei of thalamus. Each of these structures and their parts are of great importance since they play a variety of functions. The limbic system is also known to be connected to the basal ganglia and the prefrontal cortex.
- The limbic system operates by influencing the endocrine system and the autonomic nervous system. The functions carried out by the limbic system are emotion, memory, time perception, attention, consciousness, instincts and actions.

So the correct option is C) Corpora quadrigemina.

Note: Thus we see the limbic system is in control of many important functions that are of utmost importance in day to day life. Proper functioning of the limbic system is required otherwise it leads to various conditions such as emotional disorders, schizophrenia and epilepsy.