PNS And Sensory Organs

Question 1

CN I: name classification and function?

Answer 1

Olfactory nerve I: provides sensory function of smell.

Question 2

CN II: name classification and function

Answer 2

Optic nerve II: provides the sensory function of vision

Question 3

What are the two other structure associated with the optic nerve?

Answer 3

Optic chiasm (the middle x-shaped portion of the optic nerve) and the optic tract (the part of the optic nerve the proceeds posteriorly from the optic chiasm into the thalamus)

Question 4

CN III: name, classification, and function?

Answer 4

Oculomotor nerve III. Motor nerve. Controls ciliary muscle, pupil constrictor, and extrinsic eyes muscles except superior oblique and lateral rectus.

Question 5

Where does CN III travel and what is its classification and function?

Answer 5

Travels through superior orbital fissure. Motor nerve. Enervates the movement of most of the eye muscles except superior oblique and lateral rectus.

Question 6

CN IV: name, classification, and function

Answer 6

Trochlear nerve IV. Motor. Enervates superior oblique muscle. Passes through superior orbital fissure.

Question 7

CN V: name, classification, and function

Answer 7

Trigeminal nerve V. Sensory AND motor. Three divisions: ophthalmic division, maxillary division, mandibular divisions. Enervates muscles of mastication, provides sense to face, teeth, and gums.

Question 8

What are the three divisions of the trigeminal nerve and what is each of their functions?

Answer 8

Ophthalmic division: V1 transmitted through superior orbital fissure, enervates forehead and scalp region
Maxillary division: V2 transmitted through the foremen rotundum to the upper jaw region providing proprioception and nociception.
Mandibular division: V3 transmitted through foremen ovale. Mixed nerve to lower jaw region. Motor to mastication.

Question 9

CN VI: name, classification, and function

Answer 9

Abducens nerve VI. Motor. Enervates lateral rectus. Transmitted through superior orbital fissure

Question 10

CN VII: name, classification, and function

Answer 10

Facial nerve VII. Both sensory AND motor. Sensory function = taste for anterior 2/3 of tongue. Motor function is to enervate facial muscles, secretion of saliva, and tears.

Question 11

CN VIII: name, classification, and function

Answer 11

Vestibulocochlear nerve VIII. Sensory. Involved in equilibrium and hearing. Transmitted through internal auditory meatus.

Question 12

CN IX: name, classification, and function.

Answer 12

Glossopharyngeal nerve IX. Both sensory AND motor. Gives sensory function of taste to posterior third of the tongue. Motor function enervates swallowing and secretion of saliva. Transmitted through jugular foramen.

Question 13

CN X: name, classification, and function.

Answer 13

Vagus nerve X. Both sensory AND motor. Motor function enervates muscles for swallowing and muscles of respiratory tract, heart, esophagus, and abdominal viscera. Sensory, forms 70% of parasympathetic division of autonomic nervous system.

Question 14

CN XI: name, classification, and function.

Answer 14

Accessory nerve XI. Motor. Enervates sternocleidomastoid, trapezius, and other muscles that move head, neck, and shoulders. Transmitted through jugular foramen.

Question 15

CN XII: name, function, and classification

Answer 15

Hypoglossal nerve XII. Motor. Innervates muscles of the tongue.