N4: cranial nerves Flashcards
1
Q
CN I
A
olfactory nerve
2
Q
CN II
A
optic nerve
3
Q
CN III
A
occulomotor nerve
4
Q
CN IV
A
trochlear nerve
5
Q
CN V
A
trigeminal nerve
6
Q
CN V1
A
opthalamic nerve
7
Q
CN V2
A
maxillary nerve
8
Q
CN V3
A
mandibular nerve
9
Q
CN VI
A
abducens nerve
10
Q
CN VII
A
facial nerve
11
Q
CN VIII
A
vestibulocochlear nerve
12
Q
CN IX
A
glossopharangeal nerve
13
Q
CN X
A
vagus
14
Q
CN XI
A
spinal accessory nerve
15
Q
CN XII
A
hypoglossal nerve
16
Q
where does CNI exit skull
A
Cribriform plate
17
Q
where does CNII exit skull
A
Optic canal
18
Q
where does CNIII exit skull
A
Superior orbital fissure
19
Q
where does CNIV exit skull
A
Superior orbital fissure
20
Q
where does CNV1 exit skull
A
Superior orbital fissure
21
Q
where does CNV2 exit skull
A
foramen rotundum
22
Q
where does CNV3 exit skull
A
foramen ovale
23
Q
where does CNVI exit skull
A
Superior orbital fissure
24
Q
where does CNVII exit skull
A
internal acoustic meatus -> stylomastoid fossa
25
where does CNVIII exit skull
internal acoustic meatus
26
where does CNIX exit skull
jugular foramen
27
where does CNX exit skull
jugular foramen
28
where does CNXI exit skull
jugular foramen
29
where does CNXII exit skull
hypoglossal canal
30
olfactory nerve function
sensory -> smell
31
optic nerve function
sensory -> vision
32
occulomotor nerve function
motor = skeletal and autonomic
GSM: 4 extrinsic eye muscles and levator palpebrae superioris
GVM: pupillary sphincter
33
trochlear nerve function
motor = skeletal
Superior oblique muscle of eye
34
opthalamic nerve function
sensory
Scalp, forehead and nose.
35
maxillary nerve function
sensory
Cheeks, lower eye lid, nasal mucosa, upper lip, upper teeth and palate.
36
mandibular nerve function
sensory and motor
GSS: anterior 2/3 tongue, skin over mandible and lower teeth
SVM: muscles of mastication.
37
abducens nerve function
motor = skeletal
Lateral rectus
38
facial nerve function
sensory and motor
GSS: sensation to part of ext. ear.SVS: taste from ant. 2/3 tongue, hard and soft palate.
SVM: muscles of facial expression.
GVM: lacrimal, submandibular, sublingual glands and mucous glands of mouth and nose.
39
vestibulocochlear nerve function
sensory
hearing and balance
40
glossopharangeal nerve function
motor and sensory
GSS: post. 1/3 tongue, ext. ear, and middle ear cavity.GVS: carotid body and sinus.
SVS: taste from post. 1/3 tongue.
GVM: parotid gland.
SVM: stylopharyngeus
41
vagus nerve function
sensory and motor
GSS: ext. ear, larynx and pharynx.GVS: larynx, pharynx and, thoracic & abdominal viscera.
SVS: taste from epiglottis region of tongue
GVM: smooth muscles of pharynx, larynx and most of the GIT.
SVM: most muscles of pharynx and larynx.
42
spinal accessory nerve function
motor = skeletal + pharangeal
GSM: trapezius and sternocleidomastoid.
SVM: a few fibres run with CNX to viscera.
43
hypoglossal nerve function
motor = skeletal
Intrinsic and extrinsic tongue muscles (except the palatoglossus).
44
rules of cranial nerves
1. Nuclei are approximately located at the level of where the nerve itself emerges but are drawn on the dorsal surface.
2. Each sub-function (Motor, Sensory, Autonomic) must associate with a different nucleus
3. Motor is medial, and sensory is lateral (autonomic in between)
45
where do optic nerves cross?
optic chiasm
46
anatomical course of oculomotor nerve
oculomotor nucleus (midbrain) -> superior orbital fissure
47
motor functions of superior branch of oculomotor nerve
Superior rectus – elevates the eyeball
Levator palpabrae superioris – raises the upper eyelid.
48
motor functions of inferior branch of oculomotor nerve
Inferior rectus – depresses the eyeball
Medial rectus – adducts the eyeball
Inferior oblique – elevates, abducts and laterally rotates the eyeball
49
structures recieving parasympathetic innervation from the oculomotor nerve
Sphincter pupillae – constricts the pupil, reducing the amount of light entering the eye.
Ciliary muscles – contracts, causes the lens to become more spherical, and thus more adapted to short range vision
