Cranial Nerves Flashcards
(52 cards)
1
Q
Olfactory (function)
A
Sensory
2
Q
Optic (function)
A
Sensory
3
Q
Oculomotor (function)
A
Motor
4
Q
Trochlear (function)
A
Motor
5
Q
Trigeminal (function)
A
Both
6
Q
Abducens (function)
A
Motor
7
Q
Facial (function)
A
Both
8
Q
Auditory/Vestibulocochlear (function)
A
Sensory
9
Q
Glossopharyngeal (function)
A
Both
10
Q
Vagus (function)
A
Both
11
Q
Accessory/Spinal (function)
A
Motor
12
Q
Hypoglossal (function)
A
Motor
13
Q
Terminal (function)
A
Sensory
14
Q
Vomeronasal (function)
A
Sensory
15
Q
Epiphyseal (function)
A
Sensory
16
Q
Anterior Lateral Line (function)
A
Sensory
17
Q
Posterior Lateral Line (function)
A
Sensory
18
Q
I
A
Olfactory
19
Q
II
A
Optic
20
Q
III
A
Oculomotor
21
Q
IV
A
Trochlear
22
Q
V
A
Trigeminal
23
Q
VI
A
Abducens
24
Q
VII
A
Facial
25
VIII
Auditory/Vestibulocochlear
26
IX
Glossopharyngeal
27
X
Vagus
28
XI
Accessory/Spinal
29
XII
Hypoglossal
30
0
Terminal
31
VN
Vomeronasal
32
E
Epiphyseal
33
P
Profundus
34
ALL
Anterior Lateral Line
35
PLL
Posterior Lateral Line
36
- smell info from nose
- cell bodies: olfactory epithelium → olfactory bulb
- in mammals: travels through cribiform plate of the ethmoid bone via foramina
Olfactory
37
- visual info from eyes
Optic
38
- movement of eyeball & pupil reflex
Oculomotor
39
- movement of eyeball
- arises dorsally from the brain
- smallest cranial nerve along w/ VI-Abducens
Trochlear
40
- 3 branches:
1) Ophthalmic - in agnathans, osteichthyans, tetrapods; primitively a separate Profundus nerve
2) Maxillary - "infraorbital" in fishes
3) Mandibular - has the only motor fibers in this nerve; control jaw muscles & tensor tympani
- all branches contain sensory fibers: info from skin of the head & other structures in the mouth & nose
Trigeminal
41
- movement of eyeball
- arises at anterior end of hindbrain
- smalles cranial nerve along w/ IV - Trochlear
Abducens
42
- arises from anterior end of hindbrain
- Sensory Function:
1) in fish: taste buds in ectoderm, general sensation from endoderm of 2nd arch
2) in tetrapods: taste buds on anterior of tongue
- Motor Function:
1) innervates muscles of hyoid arch (facial & stapedius)
2) innervates some endocrine glands via autonomic ganglia
Facial
43
- auditory & equilibriatory info from membranous labyrinth
- arises from medulla oblongata
- 2 branches:
1) cochlear → cochlea
2) vestibular nerve → semicircular canals
Auditory/Vestibulocochlear
44
- arises from medulla oblongata
- Motor Function:
1) muscles derived from 3rd arch
2) parotid salivary gland via otic ganglion
- Sensory Function:
1) in fishes: lateral line canals
2) in tetrapods: proprioreceptors in the innervated muscles
3) in mammals: taste buds & general receptors on posterior surface of the tongue
Glossopharyngeal
45
- arises from medulla oblongata
- Sensory Function:
1) posterior walls of some gills & demibranchs
2) sensation & taste on a portion of the palate
3) sensation of coelomic viscera
- Motor Function:
1) pharyngeal arches (chief respiratory nerves in fish)
2) movement of smooth muscles in the coelomic viscera
Vagus
46
1) internal ramus
- joins Vagus to autonomic ganglia in the coelom
2) external ramus
- emerge from the spinal cord & eventually innervate the neck muscles
Accessory/Spinal
47
- arises from hypoglossal nucleus
- innervates tongue muscles & geniohyoid
- a spinal nerve "locked up" in the braincase due to the location of the foramen magnum
Hypoglossal
48
- play a role in reproductive behaviors
- lies close to olfactory bulb & tract
- in humans, rarely seen in dissections
Terminal
49
- smell info from vomeronasal organ
- terminate in an accessory olfactory bulb
- only in some reptiles
Vomeronasal
50
- light info from pineal & parapineal (when these are photoreceptors such as in lampreys & lizards)
Epiphyseal
51
- maybe fused with Trigeminal
Profundus
52
- mechanoreceptive info from lateral lines
| - actually 3 nerves
Anterior & Posterior Lateral Line
