Lab 10.2: Study questions
Terms
undefined, object
copy deck
- Which cranial nerve emerges from the dorsal aspect of the brainstem? What else is unique about this nerve?
-
*Trochlear (CN IV)
*it is also the only cranial nerve that decussates - Which nerves emerge from the medulla?
-
*hypoglossal (CN XII)
*spinal accessory (CN XI)
*vagus (CN X)
*glossopharyngeal (CN IX) - Which cranial nerves emerge from the pons?
- *trigeminal (V)
- Which cranial nerves emerge from the mid-brain?
-
*occulomotor (CN III)
*trochlear (CN IV) - Which nerves emerge from the crevice between the pons and medulla?
-
*vestibulocochlear (CN VIII)
*facial nerve (CN VII)
*abducens nerve (CN VI) - Which cranial nerve exits from between the olive and pyramid?
- Hypoglossal (CN XII)
- Which cranial nerve has a branch that enters the cranium through the foramen magnum and exits through the jugular foramen?
- Spinal accessory (CN XI)
- Which cranial nerves course through the superior orbital fissue?
-
*occulomotor (CN III)
*trochear (CN IV)
*ophthalmic division of trigeminal (CN V-1)
*abducens nerve (CN VI) - Which cranial nerves are purely motor in function and what is the musculature supplied by each?
-
*CN III - extraocular muscles
*CN IV - superior oblique
*CN VI - lateral rectus
*CN XI - trapezius, SCM
*CN XII - muscles of the tongue - Damage to which cranial nerve causes ptosis?
- Occulomotor (CN III) which innervates the palpebral muscle. Note that ptosis can also be caused by damage to the sympathetic innervation of the superior tarsal plate.
- Which cranial nerves mediate the corneal reflex? What is a major clinical problem following loss of this reflex?
-
*the sensory aspect is mediated by CN V, the motor aspect is mediated by CN VII
*corneal abrasion - Which cranial nerves carry sensation from the skin of the face and scalp?
-
*CN V - skin of face and anterior half of the scalp
*CN VII, X, XI - skin of ear
*C2 - posterior half of the scalp - Which cranial nerve carries information from the tip of the tongue about taste? About touch? About thermal events?
-
*CN VII - taste from the anterior 2/3 of the tongue
*CN V - touch, pain, and temperature from the anterior 2/3 of the tongue - If the right hypoglossal nerve were damaged, to which side would the tongue deviate upon protrusion?
- It would deviate towards the side of the lesion - in this case, to the right.
- Hoarseness, deviation of the uvula, and difficulty swallowing are all signs of damage to which cranial nerve?
- Vagus (CN X)
- What test is used to assess the function of CN XI?
- The sppinal accessory nerve can be tested with the shoulder shrug and lateral rotation of the head.
- How do deficits produced by damage to CN VII along its intradural course compare with those resulting from damage distal to the stylomastoid foramen?
-
*proximal lesions result in paralysis of facial muscles, loss of taste, and loss of lacrimation
*distal lesions result in paralysis of facial muscles only