Neuro - CN IX, X, XI, and XII

Question 1

Identify the location of the cell bodies of origin as well as the origin and termination of the SE component of the hypoglossal nerve.

Answer 1

hypoglossal nucleus in medulla -> rootlets exit adjacent to pyramid -> innervate intrinsic tongue muscles

Question 2

Identify the location of the cell bodies of origin as well as the origin and termination of the SE component of the spinal accessory nerve.

Answer 2

spinal gray in cervical region -> innervate trapezius and sternocleidomastoid muscles

Question 3

Identify the location of the cell bodies of origin as well as the origin and termination of the SVE component of the vagus nerve.

Answer 3

nucleus ambiguus -> muscles of speech and swallowing

Question 4

Identify the location of the cell bodies of origin as well as the origin and termination of the 2 GVE components of the vagus nerve.

Answer 4

• dorsal motor nucleus of vagus -> viscera from neck to transverse colon (parasympathetic)
• nucleus ambiguus -> cardiac inhibition

Question 5

Identify the location of the cell bodies of origin as well as the origin and termination of the GSA component of the vagus nerve.

Answer 5

skin of ear and middle ear cavity -> superior ganglion of vagus nerve -> trigeminal spinal nucleus

Question 6

Identify the location of the cell bodies of origin as well as the origin and termination of the GVA component of the vagus nerve.

Answer 6

epiglottis -> inferior ganglion of vagus nerve -> solitary nucleus

Question 7

Identify the location of the cell bodies of origin as well as the origin and termination of the SVA component of the vagus nerve.

Answer 7

epiglottis (taste) -> inferior ganglion of vagus nerve -> solitary nucleus

Question 8

Identify the location of the cell bodies of origin as well as the origin and termination of the SVE component of the glossopharyngeal nerve.

Answer 8

nucleus ambiguus -> stylopharyngeus muscle

Question 9

Identify the location of the cell bodies of origin as well as the origin and termination of the GVE component of the glossopharyngeal nerve.

Answer 9

inferior salivatory nucleus -> otic ganglion -> parotid gland

Question 10

Identify the location of the cell bodies of origin as well as the origin and termination of the GSA component of the glossopharyngeal nerve.

Answer 10

skin of ear -> superior ganglion of glossopharyngeal nerve -> trigeminal spinal nucleus

Question 11

Identify the location of the cell bodies of origin as well as the origin and termination of the 2 GVA components of the glossopharyngeal nerve.

Answer 11

• carotid body and carotid sinus (blood pressue and blood oxygen/carbon dioxide)
• posterior 1/3 of tongue -> inferior ganglion of glossopharyngeal nerve -> solitary nucleus

Question 12

Identify the location of the cell bodies of origin as well as the origin and termination of the SVA component of the glossopharyngeal nerve.

Answer 12

posterior 1/3 of tongue -> inferior ganglion of glossopharyngeal nerve -> solitary nucleus

Question 13

Name the striated muscle(s) innervated by the hypoglossal nerve.

Answer 13

intrinsic tongue muscles

Question 14

Name the striated muscle(s) innervated by the spinal accessory nerve.

Answer 14

trapezius and sternocleidomastoid muscles

Question 15

Name the gland innervated by CN IX. Name the parasympathetic ganglion involved.

Answer 15

• parotid gland

- otic ganglion

Question 16

What is the effect of a lesion of CN XII?

Answer 16

• lower motor neuron lesion
• tongue deviates toward the side of the lesion
• fasciculations
• atrophy

Question 17

What is the effect of a lesion of CN XI?

Answer 17

• patient cannot turn head against resistance

- patient cannot shrug shoulders against resistance

Question 18

What is the effect of the jugular foramen syndrome (affects CN IX, X, XI, and XII)?

Answer 18

• pain in or behind the external ear
• headache (irriation of meningeal branch of CN X)
• hoarseness (muscles of speech)
• dysphagia (difficulty in swallowing, muscles of swallowing)