Cranial Nerves Flashcards
CN 1
Olfactory
CN 2
Optic
CN 3
Oculomotor
CN 4
Trochlear
CN 5
Trigeminal
CN 6
Abducens
CN 7
Facial
CN 8
Vestibulocochlear
CN 9
Glossopharyngeal
CN 10
Vagus
CN 11
Accessory
CN 12
Hypoglossal
The graphic used for CN is on slide 2
memorize it
Cranial nerves are functionally either ____ (afferent) neurons only, or ___ (some combination of afferent (sensory) and efferent (motor) neurons)
sensory
mixed
Only ENTIRELY SENSORY cranial nerves?
Olfactory (CN1)
Optic (CN2)
One cranial nerve is so predominantly sensory that its motor function is frequently overlooked?
Cranial nerve VIII (vestibulocochlear)
Cranial nerves ___, ___, and ___ are thus called sensory nerves (even though CN VIII is not exclusively sensory)
I, II, and VIII
There are no cranial nerves that are exclusively ___ throughout their entire length
motor
Cranial nerves __, __, __, __, and __ are commonly called motor nerves because their function is predominantly motor
They are often said to be “mixed, mainly motor” or “mixed, primarily motor” (as in the following slides)
III, IV, VI, XI, and XII
It is a general principle that the sensory function of such nerves is ____ of the muscles over which they exert motor control (the following slides assume that fact, and do not necessarily repeat proprioceptive functions)
proprioception
Cranial nerves __, __, __, and __ are termed mixed nerves because they have substantial motor and sensory functions, and contain axons of both sensory and motor neurons
V, VII, IX, and X
Most cranial nerves that have a motor function innervate more than one muscle, but the sole mission of two cranial nerves is to innervate a single muscle each.
Which cranial nerves?
Trochlear (IV) innervates the superior oblique
Abducens (VI) innervates the lateral rectus
Both muscles are extrinsic muscles of the eye
All ___ cranial nerves have neurons that innervate somatic (skeletal) muscles
motor
Some motor cranial nerves also have autonomic motor axons, which are?
III (oculomotor)
VII (facial)
IX (glossopharyngeal)
X (vagus)