Question

question 19
2 pts
a) name 1 function of cranial nerve x vagus
b) name all the cranial nerves supplying the extraocular muscles that move the eyeball?

Explanation:

Part A:

The vagus nerve (cranial nerve X) has multiple functions, including regulating the heart rate (parasympathetic innervation to the heart), controlling smooth muscle and glands in the digestive tract (like promoting peristalsis and secretion), or innervating laryngeal muscles for voice production. One common function is regulating heart rate (parasympathetic control to slow the heart rate) or innervating digestive organs (stimulating digestion).

Part B:

The extraocular muscles (which move the eyeball) are supplied by three cranial nerves:

• Oculomotor nerve (III): Supplies most extraocular muscles (superior, inferior, medial rectus; inferior oblique; and levator palpebrae superioris).
• Trochlear nerve (IV): Supplies the superior oblique muscle.
• Abducens nerve (VI): Supplies the lateral rectus muscle.

Answer:

A) One function of cranial nerve X (vagus) is to regulate heart rate (or innervate digestive organs, control laryngeal muscles, etc.).
B) The cranial nerves supplying extraocular muscles are the Oculomotor nerve (III), Trochlear nerve (IV), and Abducens nerve (VI).