Question

Commissural fibers

A) carry pain information to the correct brain structure.

B) are divided by the longitudinal fissure.

C) link the cerebral cortex to the diencephalon.

D) interconnect and allow communication between cerebral hemispheres.

E) connect the frontal lobe to other lobes of the same hemisphere.

Answer 1

Option 'D' is correct

Justification: The commissural fibers are also known as transverse fibers, which are the axons that connects two hemispheres of the brain. So, commissural fibers are the fibers which interconnect and allow communication between the two hemispheres of the brain.

Justification for incorrect options:

• Option 'A' is incorrect because the structure which carries pain information to the correct brain structure is the lateral spinothalamic tract, as it transmits the sensation of pain and temperature to the thalamus of the brain.
• Option 'B' is incorrect because the longitudinal fissure divides the two cerebral hemispheres of brain whereas the commissural fibers connects them.
• Option 'C' is incorrect because cerebral cortex is connected to diencephalon by projection fibers but NOT by commissural fibers.
• Option 'E' is incorrect because the structure which connects the frontal lobe to other lobes of the same hemisphere is the corpus callosum, which are the thick bundle of fibers located within the medial longitudinal fissure.

Thank you!