Lecture #18 Chapter 11 (Cranial Nerves)

Question 1

How many pairs of cranial nerves are there?

Answer 1

12

Question 2

How many of the cranial nerves are attached to the brainstem?

Answer 2

10

Question 3

What are the twelve cranial nerves?

Answer 3

Old-Olfactory I
Operators-Optic II
Occasionally-Oculomotor III
Troubleshoot (Track)-Trochlear IV
Tricky-Trigeminal V
Abducted-Abducens VI
Family-Facial VII
Veterans-Vestibulocochlear VIII
Galloping-Glossopharyngeal IX
Valiantly-Vagus X
Across-Accessory
History-Hypoglossal

Question 4

Cranial nerve I?

Answer 4

-Olfactory nerve
-Sensory nerve
-Associated with sense of smell
-Bipolar neurons; pass through the cribriform plate of the ethmoid bone, and enter olfactory bulbs

Question 5

Cranial Nerve II?

Answer 5

-Optic Nerve
-Sensory nerve
-Neuron cell bodies from ganglion layers of the retina, and pass through the optic foramina of the orbits

Question 6

Cranial nerve III?

Answer 6

-Oculomotor nerve
-Motor nerve
-Motor impulses to several voluntary muscles that raise eyelids, move the eyes
-Motor impulses to involuntary muscles that focus the lens, adjust the light entering the eye (part of the autonomic system)
-Small sensory component in proprioceptive fibers

Question 7

Cranial nerve IV?

Answer 7

-Trochlear nerve
-Motor nerve
-Motor impulses to one pari of muscle that move the eyes
-Small sensory component in proprioceptive fibers

Question 8

Cranial nerve V?

Answer 8

-Trigeminal nerve
-Mixed nerve
-Has three large sensory branches which are ophthalmic division, maxillary division, and mandibular division
-Motor to muscles of mastication

Question 9

What does the ophthalmic division of the trigeminal verve do?

Answer 9

Sensory from surface of eyes, tear glands, scalp, forehead, and upper eyelids

Question 10

What does the maxillary division of the trigeminal nerve do?

Answer 10

Sensory from upper teeth, upper gum, upper lip, palate, and skin of the face

Question 11

What does the mandibular division of the trigeminal nerve do?

Answer 11

Sensory from the scalp, the skin of jaw, lower teeth, lower gum, and lower lip

Question 12

What does the mandibular division of the trigeminal nerve do?

Answer 12

Sensory from the scalp, the skin of the jaw, lower teeth, lower gum, and lower lip

Question 13

Cranial nerve VI?

Answer 13

-Abduces nerve
-Motor nerve
-Motor impulses to one pair of muscles that move the eyes
-Small sensory component in proprioceptive fibers

Question 14

Cranial nerve VII?

Answer 14

-Facial nerve
-Mixed nerve
-Sensory from taste receptors, motor to muscles of facial expression, tear glands, and salivary glands

Question 15

Cranial nerve VIII?

Answer 15

-Vestibulocochlear nerve
-Sensory nerve
-Two branches which are vestibular branch for sensing equilibrium and cochlear for hearing receptors

Question 16

Cranial nerve IX?

Answer 16

-Glossopharyngeal nerve
-Mixed nerve
-Sensory from pharynx, tonsils, part of the tongue (the region posterior to the nasal cavity, the oral cavity, and the larynx)
-Motor to salivary glands and muscles of pharynx (for swallowing)

Question 17

Cranial nerve X?

Answer 17

-Vagus nerve
-Mixed nerve
-Autonomic motor to heart, abdomen, and other viscera of thorax
-Sensory from pharynx, larynx, esophagus, and viscera of thorax and abdomen

Question 18

Cranial nerve XI?

Answer 18

-Accessory nerve
-Motor nerve
-Contain cranial branch (Join vagus nerve; motor to muscles of the soft palate, pharynx, and larynx? and spinal branch (Motor to muscles of the neck and back)

[-Small sensory component in proprioceptive fibers]

Question 19

Cranial nerve XII?

Answer 19

-Hypoglossal nerve
-Motor nerve
-Motor to muscles of the tongue for speaking, chewing, and swallowing
-Small sensory component in proprioceptive fibers