24 - Orbit Laughty

Front 1

What bones form the roof of the orbit?

Back 1

orbital plate of frontal bone & lesser wing of sphenoid bone

Front 2

What bones form the medial wall of the orbit?

Back 2

frontal process of maxilla, lacrimal bone, & orbital plate of ethmoid

Front 3

7 bones of orbit?

Back 3

Sphenoid
Frontal
Lacrimal
Zygomatic
Palatine
Maxilla
Ethmoid

Front 4

What goes through optic foramen?

Back 4

optic nerve & ophthalmic artery

Front 5

What goes through superior orbital fissure?

Back 5

CN3, CN4, VI of CN5, CN6, & ophthalmic veins and postganglionic sympathetic fibers

Front 6

what goes through inferior orbital fissure?

Back 6

infraorbital (V2 - formerly maxillary) and zygomatic nerves & vessels

Front 7

what happens at fornix (in eyelid)?

Back 7

skin becomes palpebral conjunctiva and goes up/down eye lid; reflects at fornix and comes down along globe of eye as bulbar conjunctiva

Front 8

structure that keeps the form of the eyelid?

Back 8

Tarsal plate

Front 9

Origin of levator palpebrae superioris?

Back 9

lesser wing of sphenoid

Front 10

path of levator palpebrae?

Back 10

comes from apex to pierce orbital septum with skeletal fibers

before piercing the orbital septum, it gives off smooth muscle fibers as Superior tarsal muscle

Front 11

What causes partial ptosis?

Back 11

loss of sympathetic supply to head (to superior tarsal muscle)

Front 12

What causes full ptosis?

Back 12

loss of occulomotor nerve to levator palpebrae superioris

Front 13

Fascia on the back of the eye?

Back 13

bulbar fascia

Front 14

check ligaments?

Back 14

come from periostia of bones and attach to muscle; prevent rotation

Front 15

suspensory ligament?

Back 15

thickening of bulbar fascia under eyeball

Front 16

what do tarsal plates connect to?

Back 16

lateral/medial palpebral ligaments

Front 17

fibers in lacrimal nerve?

Back 17

sensory
postgang parasympathetic
postgang sympathetic

Front 18

blood supply of retina?

Back 18

central artery of retina (from ophthalmic artery) - travels in optic nerve

Front 19

path and function of superior ophthalmic vein?

Back 19

drains supraorbital vein and front of face;

receives inferior ophthalmic vein

drains to cavernous sinus - travelling through superior orbital fissure

Front 20

what drains into inferior ophthalmic vein?

Back 20

facial veins, infraorbital vein and pterygoid plexus of veins

Front 21

what stimulates lacrimal gland?

Back 21

parasympathetic fibers from pterygopalatine ganglion (CN7)

Front 22

Risk of Bell's palsy (damage of facial nerve branches)?

Back 22

can't blink so patch that eye otherwise cornea dries out (can't reverse drying out)

Front 23

what divides lacrimal gland in half?

Back 23

tendon of levator palpebrae superioris

Front 24

Components of Deep Petrosal nerve?

Back 24

postgang. sympathetic

Front 25

Components of Greater Petrosal nerve and where it comes from?

Back 25

Comes from CN7; only pregang parasympathetic

Front 26

Components of nerve of pterygoid canal?

Back 26

postgang. sympathetic & pregang parasympathetic

Front 27

Fibers in zygomatic nerve?

Back 27

postgang sympathetic & postgang parasympathetic

Front 28

branches of zygomatic nerve?

Back 28

zygomaticotemporal & zygomaticofacial nerve

Front 29

path of postgang sympathetic in regards to lacrimal gland?

Back 29

comes off from internal carotid as deep petrosal nerve; combine with greater petrosal nerve to make nerve of pterygoid canal; go through zygomatic nerve, join lacrimal nerve to pass through lacrimal gland to innervate skin

Front 30

muscles innervated by trochlear nerve?

Back 30

superior oblique

Front 31

Muscles innervated by CN6?

Back 31

Lateral rectus muscle

Front 32

Muscles innervated by superior branch of CN3?

Back 32

superior rectus & levator

Front 33

Muscles innervated by infer. branch of CN3?

Back 33

medial rectus, inferior rectus, & inferior oblique

Front 34

fibers in long ciliary nerves and it's parent nerve?

Back 34

from nasociliary; has sensory and sympathetics

Front 35

fibers in short ciliary nerves and its parent nerve?

Back 35

from ciliary gang (inf. branch of CN3); sens, sympathetics, & postgang parasympathetic

Front 36

3 branches of ophthalmic nerve?

Back 36

nasocilliary, frontal, lacrimal

Front 37

frontal nerve?

Back 37

comes from VI of CN5; divides into supraorbital and supratrochlear

Front 38

terminal branches of nasociliary branch?

Back 38

posterior ethmoidal, anterior ethmodial, infratrochlear