Lecture 21

Question 1

Complete the following statement:

In general sensory nuclei are located __(A)___, whereas motor nuclei and located ___(B)____

Answer 1

A) Laterally

B) Medially

Question 2

What is the main function of the olfactory nerve, and what is its number?

Answer 2

Smell, I

Question 3

What is a common symptom of damage associated with the olfactory nerve (provide the technical term)?

Answer 3

anosmia, a loss of the perception of smell

Question 4

What is the main function of the optic nerve?

Answer 4

Sensory pathway for vision

Question 5

What are the main function of the optic nerve, what is it’s number?

Answer 5

vision, II

Question 6

What is a common test used to test the functioning of the optic nerve?

Answer 6

pupillary light reflex

Question 7

What is the technical term for as loss of vision?

Answer 7

anopsia

Question 8

What is the function of the oculomotor nerve?

Answer 8

• Parasympathetic innervation for pupillary constriction
• Somatic division- ipsilateral motor innervation to all of the extra-ocular muscles, except for the lateral rectus, dorsal oblique and the levator of the eyelid

Question 9

What are the functions of the trochlear and the abducens nerves?

Answer 9

Innervate two of the extra-ocular muscles. Trochlear (CN IV) supplies the contralateral dorsal oblique, abducens (CN VI) supplies the ipsilateral lateral rectus and the retractor bulbi muscles

Question 10

What are the functions of the trigeminal nerve?

Answer 10

Motor division- motor to the muscles of mastication

Sensory division- opthalmic, mandibular and maxillary branches

Question 11

Describe a reflex that is associated with the trigeminal nerve?

Answer 11

Touching the cornea should result in blinking

Question 12

Describe the innervation of the facial nerve:

Answer 12

• Autonomic fibres- supply parasympathetic innervation to all of the salivary glands
• Motor fibres- innervate muscles of facial expression
• Sensory fibres innervate rostral 2/3rds of the tongue and inner surface of the ear

Question 13

Describe the innervation of the vestibulocochlear nerve:

Answer 13

• carries sensory innervation from the cochlea and the vestibular apparatus

Question 14

What is the function of the glossopharyngeal nerve?

Answer 14

• Motor innervation to the palate and the pharynx
• sensory pathway for taste to the caudal 1/3rd and to the pharyngeal mucosa
• parasympathetic innervation to the parotid salivary glands
• common symptoms observed are difficulty in swallowing
• problems associated with the motor division- dysphagia food and water will run out of the nose when eating and drinking

Question 15

What is the function of the accessory nerve and the hypoglossal nerve?

Answer 15

CN XI- motor innervation to the trapezius

CN XII- provides motor innervation to intrinsic and extrinsic muscles of the tongue