MOD3-Cranial nerve

Question 1

Foramen-Cribriform plate of ethmoid bone
Functional Component- SA
Main target- Olfaction
Major branches- composed of flia olfactory, pass through plater to reach olfactory bulb, extension of brain
Distribution- smell from olfactory mucosa

Answer 1

CN I Olfactory

Question 2

Foramen-Optic Canal of sphenoid bone
Functional Component- SA
Main target- Vision
Assoc. ganglia- Retinal ganglion cells
Major branches- axons travel away from retina toward brain in optic nerves. Fibers from nasal portions of retina (temporal visual fields) cross over side at the optic chiasm, near pituitary gland.
Distribution- Vision from retina

Answer 2

CN II Optic

Question 3

Foramen-Superior Orbital Fissure
Functional Component- GSE, GVEp
Main target- 4 extraocular mm, 2 intraocular mm.
Associated ganglia: Ciliary GVE
Major branches: NA
Distribution: GSE-move eyeball, GVE- Parasympathicic to ciliary m., lens accommadation, spincther pupillaie m.

Answer 3

CN III Oculomotor

Question 4

Foramen-Superior Orbital Fissure
Functional Component-GSE
Main target-Superior Obligue m.
Associated ganglia: NA
Major branches-NA
Distribution- GSE an extraocular m

Answer 4

CN IV Trochlear

Question 5

N/A

Answer 5

CN V Trigeminal

Question 6

Foramen- Superior orbital fissure
Functional Component- GSE
Main target- Lateral Rectus m.
Associated ganglia: NA
Major branches-NA
Distribution- GSE an extraocular m

Answer 6

CN VI Abducens

Question 7

Foramen- Internal acoustic meatus, stylomastoid foramen
Functional Component-SA, GSA, GSE, GVEp
Main target-mm. of facial experssion. all glands except parotid
Associated ganglia:
Geniculate (GSA, SA)
Pterygopalantine (GVEp),
Submandibular GVEp

Major Division- Great petrosal-GVEp,
Chora Tympani-GVEp, SA
Temporal, Zygomatic, Buccal, Mandiublar, Cervical-GSE
Distribution-GSE- m. of facial expression
Glands- sublinua, submandibular, lacrimal, nose and palate-GVEp
Part of external audiotory meatus-GSA
taste from anter 2/3 of tongue and palate

Answer 7

CN VII Facial

Question 8

Foramen-Internal acoustic meatus
Functional Component-SA
Main target- Hearing , equilibrium
Associated ganglia- Vestibular SA balance, Cochlear-hearing SA
Major Division- Vestibular nerve and Cochlear nerve
Distribution-Inner ear

Answer 8

CN VIII Vestibulocochlear

Question 9

Foramen- Jugular foramen
Functional Component-SA, GSA, GSE, GVEp, GVA
Main target- stylopharyngeus m, oropharynx, parotid gland
Associated ganglia- OTIC ganglion (GVE)
Major branches: NA
Distributions-GSE-stylopharyngeus m.
GVE-parotid gland
GSA- external ear, post tongue
GVA-pharynx, carotid body/sinus (baroreceptor, chemoreceptors)
SA- taste from posterior 1/3 of tongue

Answer 9

CN IX Glossopharyngeal

Question 10

Foramen- Jugular Foramen
Functional Component- SA, GSA, GSE, GVEp, GVA
Main target-mm of larynx, pharynx, palate, sensation of larynx & laryngopharynx, Parasympthetics to thorax and abdomen
Associate ganglia-NA
Major branches-Recurrent, superior laryngeal (internal and external), Pharnygeal
Distribution- GSE- mm of palate, larynx, pharynx
GVE-smooth mm of trachea, glands of pharynx.
GSA-parts of External acoustic meatus and cranial dura.
GVA- pharynx, larynx
SA-taste from epiglottis and parts of tongue

Answer 10

CN X Vagus

Question 11

Foramen- Jugular Foramen
Functional Component- GSE
Main target- Trapezius, Sternocleidomastoid
Associate ganglia-NA
Major branches-NA
Distribution-

Answer 11

CN XI Spinal Accessory

Question 12

Foramen- Hypoglossal canal
Functional Component- GSE
Main target-mm. of tongue
Associate ganglia-NA
Major branches-NA
Distribution- mm of tongue all, intrinsic and extrinsic

Answer 12

CN XII Hypoglossal

Question 13

Foramen- Superior orbital fissure
Functional Component- GSA
Main target-Upper dermatome of face, orbit, nasal cavity
Associated ganglia: Trigeminal ganglion
Major branches-nasocilary, short ciliary front supraorbital, lacrimal.
Distribution- major sensory n. head..

Answer 13

CN V1 Ophthalmic

Question 14

Foramen- Foramen rontundum
Functional Component-GSA
Main target- middle dermatome of face, nasal cavity, nasopharynx, palate
Associated ganglia: Trigeminal ganglion
Major branches-infraorbital, nasopalatine, greater/lesser palantine
Distribution- major sensory n. head.. V3 GSE

Answer 14

CN V2 Maxillary

Question 15

Foramen-Foramen ovale
Functional Component-GSA, GSE
Main target-Lower dermatome of face, oral cavity, muscle of mastication
Associated ganglia:Trigeminal ganglion
Major branches-auriculotemporal, lingual, inf. alveolar, mental
Distribution- GSE an extraocular m

Answer 15

CN V3 Mandibular

Question 16

Describe Route for Sympathetic

Answer 16

Cell Bodies- T1-T5 lateral horns
Presynaptic- ALL GVEs synapse in superior cervical ganglion.
Post Synaptics-travel on arteries, then meet with GVEp(pres) at specific ganglia hitchhike together on CN V

Question 17

Describe Route for Parasymatotheics

Answer 17

Cell Bodies-
Presynaptic-synapse in parasympathetic ganglia (otic, pterygopalatine, ciliary, submandibular-all suspended from CNV.
Postsynaptic- exit ganglia

Question 18

Sinus infection

Answer 18

CN VII, CN XI