Cranial Nerves
The Eye
100
What is the name of CN VIII from memory?
Vestibulocochlear
100
What are the three layers of the eye?
Outer fibrous layer; vascular layer; inner neural layer
100
Which cranial nerve is associated with the motor function of the tongue?
Hypoglossal nerve (XII)
100
Trace the path of a photon through the eye.
Photon enters through cornea, pupil, iris, lens, retina
200
List all three subdivisions of The trigeminal nerve (CN V) and their type of output (sensory or motor or both)
Ophthalmic branch (S)
Maxillary branch (S)
Mandibular branch (B)
200
Whar are A and B, respectively?
A: Ciliary Muscle
B: Retina
200
Bell's palsy is a condition that causes sudden weakness in the muscles on one side of the face. Which cranial nerve is affected?
Facial CN VII
200
What is the name of the thin, watery fluid that fills the space between the cornea and the iris.
Aqueous Humor
300
The answer is Oculomotor (CN III), Facial (CN VII), Glossopharyngeal (CN IX), Vagus (CN X). What is the question?
List the cranial nerves with parasympathetic fibers.
300
List the nerves associated with the eye (both sensory and motor).
Optic (CN II) provides sensory information
Oculomotor (CN III), Trochlear (CN IV), and Abducens (CN VI) provide motor control
300
Answer is: Oculomotor (CN III), Trochlear (CN IV), Abducens (CN VI)
What is the question?
Which nerves are responsible for motor control of the extraocular muscles?
300
Name all 6 extraocular muscles.
Superior rectus, inferior rectus, medial rectus, lateral rectus, superior oblique, inferior oblique
400
The gag reflex can be tested to confirm the function of 2 cranial nerves. Name at least one.
Glossopharyngeal nerve (CN IX) for sensation in upper throat
Vagus nerve (CN X) for motor function of pharynx
400
What happens to the vision when there’s damage to the optic chiasm?
Loss of lateral/temporal vision; Tunnel Vision
400
Medicine really does not have a good taste; I swallow it down quickly in great haste. (Nerve name and number)
Glossopharyngeal (CN IX)
400
What happens if nerve fibers are cut at location #3?
If the right optic tract is cut, the left side of both visual fields is lost.
500
List the sensory nerves associated with the tongue and the type of sensation they provide for their region.
Trigeminal (CN V) provides general sensation of anterior 2/3
Facial (CN VII) provides taste sensation for anterior 2/3
Glossopharyngeal (CN IX) provides general and taste sensation for posterior 1/3
500
What is the “Accommodation Reflex”, what changes are occurring in the lens? Which muscle is involved in this reflex?
The lens is becoming more convex/round to increase refraction and allow for near vision. Ciliary muscle (innervated by Oculomotor nerve (CN III))
500
What cranial nerves pass through the superior orbital fissure?
The oculomotor nerve (CN III), trochlear nerve (CN IV), the ophthalmic division of the trigeminal nerve (VI), and the abducens nerve (CN VI)
500
In the light reflex, what muscle is responsible for constricting the pupil? What muscle is responsible for dilating the pupil?
Constricting: Sphincter pupillae muscles of the iris (circular fibers)
Dilating: Dilator pupillae muscles of the iris (radial fibers)
