Question

What three CNs are associated with conjugate eye movements (functional extraocular muscle)? a) Cranial Nerve III (Oculomotor)

b) Cranial Nerve IV (Trochlear)
c) Cranial Nerve VI (Abducens)
d) Cranial Nerve V (Trigeminal)

Answer 1

The three CNs associated with conjugate eye movements are the Oculomotor (CN III), Trochlear (CN IV), and Abducens (CN VI), which control the extraocular muscles responsible for coordinated eye movements.

Step-by-step explanation:

The three cranial nerves (CNs) that are associated with conjugate eye movements and are responsible for controlling the functional extraocular muscles are:

• Cranial Nerve III (Oculomotor)
• Cranial Nerve IV (Trochlear)
• Cranial Nerve VI (Abducens)

The Oculomotor nerve controls most of the extraocular muscles along with the levator palpebrae superioris, which elevates the upper eyelid. The Trochlear nerve is responsible for the contraction of the superior oblique muscle, involved in the rotation of the eye. Lastly, the Abducens nerve innervates the lateral rectus muscle, which abducts the eye. These nerves' motor nuclei connect to the brain stem, ensuring the coordination of eye movements through the medial longitudinal fasciculus.