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Flashcards in The orbit Deck (55):
1

what are the 7 bones that make up the bony orbit

sphenoid
ethmoid
lacrimal
frontal
maxilla
zyomatic
palatine

2

What are the 5 layers of the eyelid

skin
loose CT
muscular layer
tarsofacial layer
conjunctiva

3

action of orbicularis oculi

oculi part is forceful closing
palpebrral-blinking

4

what is orbicularis oculi innervated by

facial nerve VII

5

damage to the orbicularis oculi is associated with

inability to blink, dry eye, pain in eye

6

action of levator palpebrae superioris

raises the eyelid

7

what is levator palebrae superioris innervated by

oculomotor nerve III

8

loss of function of the superior tarsal or levator palpebrae superiosis

ptosis of the upper eyelid

9

function of the tarsal gland

functions to increase the viscosity of the tears and decreases the rate of evaporation of tears from the surface of the eyeball

10

blockage of the tarsal gland results in

chalazion (inner surface of eyelid

11

blockage of the sebaceous or sweat glands associated with the hair follicles is called

stye (edge of eyelid)

12

loss of innervation of the orbicularis oculi results in what and what nerve is injured

facial nerve; inability to close eyelids tightly and lower eyelid droops

13

loss of innervation of the levator palpebrae superioris by the oculomotor nerve results in

complete ptosis

14

loss of innervation of the superior tarsal muscle by sympathetic fibers results in

partial ptosis

15

what are the three features of horner's syndrome

pupillary constriction
partial ptosis
absence of sweating on the same side of the face and neck due to absence of innervation to the sweat glands

16

direction of fluid within the eye as you blink

lateral to medial

17

_______________is the opening through which fluid enters each canliculus

lacrimal punctum

18

sensory innervation of the lacrimal gland is via

opthalmic V1

19

parasympathetic innervation of lacrima gland

facial + greater petrosal= nerve to pterygoid canal
PPG
joines maxillary
travels with zygomatic nerve branches
lacrimal nerve

20

sympathetic innervation to lacrimal gland

same but don't synapse in PPG lacrimal nerve

21

what is the periosteum that lines the bones of the orbi

periorbita

22

superior rectus action

elevation ,addduction and internal rotation of eyeball

23

inferior rectus action

depression, adduction, external rotation of eyeball

24

medial rectus action

adduction of eyeball

25

lateral rectus action

abduction of eyeball

26

innervation of superior rectus, inferior rectus medial rectus and inferior oblique

oculomotor III

27

lateral rectus innervated by

abducent nerve

28

superior oblque innervated by

trochlear nerve

29

superior oblique action

down and out

30

inferior oblique action

up and out

31

how do you clinically test superior rectus

look laterally and upward

32

how do you clinically test inferior rectus

look laterally and down

33

how do you clinically test lateral rectus

look laterally

34

how do you clinically test medial rectus

look medially

35

how do you test inferior oblique

look medially and upward

36

how do you test superior oblique

look medially and downward

37

what artery supplies the orbit

opthalmic artery

38

3 sources of venous drainage to the orbit

cavernous sinus, pterygoid plexus and angular vein

39

opthalmic V1 exist MCF via

SOF

40

What are the branches off opthalmic nerve

N- nasociliary
F-frontal (supratrochlear and supraorbital)
L- lacrimal

41

branches of nasociliary nerve

communicating branch
long ciliary
posterhroi ethmoidal
anterior ethmooidal
infratrochelar

42

superior division of oculomotor nerve innervates

superior rectus and levator palebrae

43

inferior division of oculomotor innervates

inferior rectus, medial rectus, and inferior oblique

44

trochlear nerve innervates what eye muscle

superior oblique

45

abducent nerve innervates

lateral rectus

46

mneumonic for eye muscles

LR6, SO4, AO3

47

corneal reflex

opthalmic v1 afferent, VII efferent orbicularis oculi

48

cranial nerve __________ senses the light in the pupillary light reflex

CN II

49

cranial nerve _______ carriers the parasympathetics that constrict the pupil

CN III

50

what is the outside of layer of the eyeball called

fibrous layer consists of cornea and sclera

51

vascular layers of eyeball

choroid

52

nervous or inner layer of the eyeball

retina

53

vascular layer of the eyeball includes

choroid, ciliary body, and the iris

54

what artery can you see with an otoscope

central retinal artery

55

what is the optic disk

blind spon in the eye (yellow)