Question

Corticobulbar fibers via Genu of internal capsule:

A. Carry motor signals to the spinal cord
B. Carry sensory signals to the brain
C. Control facial muscles
D. None of the above

Answer 1

C. Control facial muscles.

Corticobulbar fibers via the Genu of the internal capsule primarily control facial muscles, and their axons run ipsilaterally from the cortex to the motor nucleus on the same side of the nervous system.

Step-by-step explanation:

The corticobulbar fibers via the Genu of the internal capsule are responsible for several functions related to motor control in the body. One important function of these fibers is that they help control facial muscles. The corticobulbar tract sends motor commands from the primary motor cortex through axons of Betz cells to activate upper motor neurons in the cranial motor nuclei, which are responsible for facial movements and other head and neck functions. These axons are ipsilateral, which means they stay on the same side of the nervous system as they project from the cortex to the motor nucleus. This is distinct from the corticospinal tract, which is largely contralateral, crossing the midline and synapsing on the opposite side of the body to control limbs and trunk muscles. In summary, the correct answer to the question 'Corticobulbar fibers via Genu of internal capsule' is C. Control facial muscles.