A19 - Middle Cranial Fossa Flashcards
CN I
olfactory
CN II
optic
CN III
oculomotor
CN IV
trochlear
CN V
trigeminal - ophthalmic
- maxillary
- mandibular
CN VI
Abducent
CN VII
facial
CN VIII
vestibucochlear
CN IX
glossalphrayngeal
CN X
vagus
CN XI
spinal accessory
CN XII
hypoglossal
Where does CN I exit the cranial cavity?
cribriform plate
Where does CN II exit the cranial cavity?
optic canal
What exits via the superior orbital fissure?
CN III, IV, Va, Vi
What branch of trigeminal exits via foramen rotundrum?
CN Vb
What branch of trigeminal exits via foramen ovale?
CN Vc
What 2 nerves exit via the internal acoustic meatus
CN VII VIII
Nerves CN IX, X and XI exit via where?
jugular foramen
Where does CN XII exit the cranial cavity?
hypogloassal canal
What modality does CN I have and what does it supple?
special sensory to smell
What modality does CN II have and what does it supple?
special sensory to sight
CN III contains somatic motor and parasympathetic fibres, what do these supply ?
motor - 4 muscles of the eye
parasympathetic - sphincter pupillae
CN IV supplies the superior oblique muscle, what modality does it have?
somatic motor
The ophthalmic and maxillary division of CN V contain somatic sensory fibres to what?
Va - skin of the upper face
Vb - skin of the mid face
What modalities doe CN Vc have and what do they supply?
somatic motor - muscles of mastication
somatic sensory - skin of lower face
Superior oblique is supplied by the motor fibres of which nerve?
CN VI
What modalities doe CN V II have and what do they supply?
somatic motor - muscles of facial expression
somatic sensory - ear
special sensory - posterior 2/3 of the tongue
parasympathetic - submandibular/sublingual gland
The vestibucochlear nerve supplies special sensory to?
balance and hearing
The glossalpharyngeal nerve supplies what?
somatic motor and sensory - pharynx
special sensory - posterior 1/3 of tongue
parasympathetic - parotid gland
What modalities doe CN X have and what do they supply?
somatic motor - pharynx and larynx
somatic sensory - back of the throat
special sensory - epiglotis
parasympathetic - organs of body
What does the spinal accessory nerve supply motor innervation to?
sternocleidomastoid and trapezius
CN XII suppies …. to ….
somatic motor
tongue
What is the point where the optic nerves cross over =?
optic chiasm
What bones make up the anterior cranial fossa?
frontal
ethmoid
lesser wing of the sphenoid
What bones make up the middle cranial fossa
lesser wing of sphenoid
temporal bone
What bones make up the posterior cranial fossa?
temporal
occipital
What is the layer of dura which sits over the pituitary gland?
Diaphragm sellae
What nerves arise in the forebrain?
CN I II
Where does CN III arise
Midbrain
What is the only nerve to arise in the posterior midbrain?
CN IV
Where does CN V arise
directly from the pons
Which nerve rises between the pons and medulla ?
CN VI
Where does the facial nerve arise?
brainstem
