Anatomy 2 Block 3: Interior of the Skull & Cranial Nerves

Question 1

What passes through the Foramen Cecum:

Answer 1

for emissary veins, valveless thus infection can pass through; also damage can yield subdural hematoma.

Question 2

What passes through the Cribriform Foramina:

Answer 2

Passage of axons for olfactory nerves.

Question 3

What passes through the Anterior and Posterior Ethmoidal Foramina:

Answer 3

contains similarly named arteries and veins

Question 4

What passes through the Optic Canal:

Answer 4

CN II and ophthalmic artery

In base of lesser wings of spheniod

Question 5

What passes through the superior orbital fissure:

Answer 5

CN II, CN IV, CN V1, CN VI, ophthalmic veins

Found between greater and lesser wings of sphenoid

Question 6

What passes throughout the foramen rotundum:

Answer 6

CN V2

Question 7

What passes throughout the foramen oval:

Answer 7

CN V3, lesser petrosal nerve, accessory meningeal artery

Question 8

What passes throughout the foramen spinosum:

Answer 8

Middle meningeal artery

Question 9

What passes throughout the foramen lace rum:

Answer 9

for greater petrosal nerve, ascending pharyngeal artery, emissary veins

Question 10

What passes throughout the carotid canal:

Answer 10

Internal carotid artery and nerve plexus

Question 11

What passes throughout the Foramen Magnum:

Answer 11

brainstem/spinal cord, vertebral arteries, CN XI spinal root

Question 12

What passes throughout the Internal Acoustic Meatus:

Answer 12

CN VII and VIII

Question 13

What passes throughout the Jugular Foramen;

Answer 13

CN IX, CN X, CN XI, inferior petrosal sinus, sigmoid sinus/superior bulb of internal jugular vein

Question 14

What passes throughout the Hypoglossal Canal:

Answer 14

CN XII

Question 15

CN I - Olfactory

Answer 15

Pass through cribriform plate

SA fibers for smell

Question 16

CN II - Optic

Answer 16

Pass through optic canal

SA fibers for vision

Question 17

CN III - Oculomotor

Answer 17

Pass through anterior edge of tentorium cerebella
Enters orbit passing through superior orbital fissure
GSE for most extraocular muscles
GVE (parasympathetic) for pupillary constrictor muscles and ciliary muscles for accommodation

Question 18

CN IV - Trochlear

Answer 18

Enters orbit through superior orbital fissure

GSE to superior oblique muscle of eye

Question 19

CN VI - Abducent

Answer 19

Motor
Passes through dura covering clivus, cavernous sinus and superior orbital fissure
GSE to lateral rectus muscles

Question 20

CN V - Trigeminal

Answer 20

Mixed

3 divisions @ trigeminal ganglia

Ophthalmic
Maxillary
Mandibular

• Standing Room Only
• Superior Fissure, Rotundum, Ovale

Question 21

CN V1 - Ophthalmic

Answer 21

Sensory
Passes through superior orbital fissure
GSA from orbital contents, parts of face, nasal cavity, sinuses and dura

Question 22

CN V2 - Maxillary

Answer 22

Sensory
Passes through foramen rotundum
GSA from parts of face including nasal cavities, palate, maxillary teeth, maxillary sinus, dura

Question 23

CN V3 - Mandibular

Answer 23

Mixed sensory and motor

Passes through foramen oval

GSA to parts of face, TMJ, mandibular teeth, tongue, mouth and dura

SVE to muscles of mastication and other muscles from 1st pharyngeal arch

Question 24

CN VII - Facial

Answer 24

Mixed - motor and sensory

Leave cranial cavity through internal acoustic meatus, exits skull via Stylomastoid Foramen

SVE - facial expression
SA - taste from anterior 2/3 tongue
GSA - small part of ear
GVE (parasympathetic) - lacrimal gland, salivary glands

Upper half of face controlled bilaterally
Lower half of face is controlled contralaterally

Question 25

CN VIII - Vestibulocochlear

Answer 25

Sensory

Passes through internal acoustic meatus

SA in vestibular for balance and cochlear for hearing

Question 26

CN IX - Glossopharyngeal

Answer 26

Mixed - motor and sensory

Passes through Jugular Foramen

SVE to stylopharyngeous muscle
GVE (parasympathetic) to parotid gland
SA to taste posterior 1/3 tongue
GSA from oral cavity and middle ear
GVA from carotid body and sinus

Question 27

CN X - Vagus

Answer 27

Mixed - sensory and motor

Passes through Jugular Foramen

Question 28

CN XI - Accessory

Answer 28

Motor

Spinal roots of nerve pass into cranium through foramen magnum and leave via jugular foramen

GSE - to trapezius and sternocleidomastoid msucles
SVE - to same as SVE for CN X

Question 29

CN XII - Hypoglossal

Answer 29

Motor

Exits through hypoglossal canal

GSE to tongue muscles

Question 30

Oh, Oh, Oh, To Touch And Feel Very Good Velvet…Ah, Heaven

Answer 30

-

Question 31

Some Say Marry Money But My Brother Says Big Boobs Matter More

Answer 31

-

Question 32

Branches of the Facial Nerve:

Answer 32

Temporal - orbicularis oculi
Zygomatic - levator labii superioris
Buccal - buccinator
Mandibular - orbicularis oris
Cervial - platysma