Question

multiple choice 2 points
which cranial nerve innervates most of the viscera in the thoracic and abdominopelvic cavities?
vagus nerve (x)
abducens nerve (vi)
trochlear nerve (iv)
accessory nerve (xi)
hypoglossal nerve (xii)

Explanation:

Identify the target question

The question asks which cranial nerve innervates most of the viscera in the thoracic and abdominopelvic cavities.

Analyze the options using mastered concepts

Using the Cranial Nerves knowledge point:

• Vagus nerve (CN X): Extends beyond the head and neck to provide parasympathetic innervation to the heart, lungs, and digestive tract.
• Abducens nerve (CN VI): Innervates the lateral rectus muscle of the eye.
• Trochlear nerve (CN IV): Innervates the superior oblique muscle of the eye.
• Accessory nerve (CN XI): Innervates the sternocleidomastoid and trapezius muscles.
• Hypoglossal nerve (CN XII): Innervates the muscles of the tongue.

Determine the correct choice

The Vagus nerve (CN X) is the only cranial nerve that travels down into the thorax and abdomen to innervate visceral organs.

Answer:

• Vagus nerve (X) (Correct answer)
• Abducens nerve (VI)
• Trochlear nerve (IV)
• Accessory nerve (XI)
• Hypoglossal nerve (XII)