X hits on this document

67 views

0 shares

0 downloads

0 comments

8 / 26

o

Foramen spinosum: middle meningeal vessels, greater petrosal nerve

o

Hypophyseal fossa: hypophysis cerebri (pituitary gland)

o

Optic groove (chiasmatic sulcus): leads to optic canal

o

Optic canal: optic nerve and ophthalmic artery

o

Foramen lacerum: b/w hypophyseal fossa and apex of petrous bone

o

Carotid groove: internal carotid artery

Hypophysis cerebri (pituitary gland)

o

Inferior to circular dural fold, which covers hypophyseal fossa

Fold=diaphragma sellae

Orbit and Contents

Orbits: deep bony sockets for eyeballs and related structures

Orbit = pyramidal

o

Four walls

o

Apex=optic canal, @ jxn of lesser wing and body of sphenoid bone

o

Medial walls are parallel

o

Lateral walls: right angles

o

Eyeball: half as long as orbit, occupies anterior half

o

Roof=anterior cranial fossa

o

Floor=large maxillary sinus

o

Medial wall=ethmoidal sinuses

o

Anterior=frontal sinus

Ethmoidal cells have tendency to invade

o

Bones lined with periosteum=periorbita; continuous with dura mater of cranial cavity

Optic canal: optic nerve & ophthalmic artery

Superior orbital fissure: ophthalmic vein, CN III, IV, V1, VI

Superior approach

Trochlear nerve

o

Along lateral wall of cavernous sinus, lateral to internal carotid artery

o

In superior orbital fissure, intimate contact with frontal nerve

o

Goes to superior border of superior oblique muscle

Frontal nerve

o

1st trigeminal division thru superior orbital fissure

o

divides into small supractrochlear nerve and larger supraorbital nerve

o

goes on to forehead and scalp region

lacrimal nerve

o

lateral to frontal nerve

o

goes to lacrimal gland

levator palpebrae superioris

o

most superiorly positioned muscle

o

raises upper lid

o

various layers inserted into different parts

superior rectus

o

inferior to levator palpebrae superioris

o

attached to eyeball by tendinous expansion

o

innervated by oculomotor nerve (CN III)

superior oblique muscle

o

goes thru pulley, trochlea

o

tendon bends at acute angle

o

goes to insertion into lateral and posterior portion of eyeball

inferior oblique

o

inserts into sclera

four recti muscles

o

arise from tough tendinous ring or cuff: anulus tendineus

surrounds optic canal

partially includes superior orbital fissure

two heads of lateral rectus attached to ring

Document info
Document views67
Page views67
Page last viewedSat Dec 10 11:51:30 UTC 2016
Pages26
Paragraphs2571
Words8835

Comments