Oculoplastics - Muscles And Nerves

Front 1

What does the supraorbital nerve innervate?

Back 1

Forehead and brow

Front 2

What does the suprtrochlear nerve innervate?

Back 2

Forehead and medial upper lid

Front 3

What does the posterior ethmoidal nerve innervate (2)

Back 3

ethmoid sinus and nasal mucosa

Front 4

What does the the anterior ethmoidal nerve innervate?

Back 4

ethmoid sinus and nasal mucosa

Front 5

What does the infratrochelar nerve innervate and what does it come from? (3)

Back 5

medial lids
conjunctiva
canthus
V1

Front 6

What does the ciliary ganglion contain and what does it come from?

Back 6

short ciliary nerve to the globe from V1

Front 7

What does the long ciliary nerve innervate and where does it come from? (3)

Back 7

iris
ciliary muscle
cornea
V1

Front 8

What does the lacrimal nerve innervate (3)

Back 8

lateral upper lid
lateral canthus
lacrimal gland

Front 9

What does the zygomatico facial nerve innervate?

Back 9

cheek

Front 10

What does the zygomaticotemporal nerve innervate (2)

Back 10

lateral forehead and lacrimal gland

Front 11

What does the infraorbital nerve innervate and where does it come from? (4)

Back 11

lower lids
nose
cheek
upper lip

Front 12

What nerves may be damaged during ptosis repair (2)?

Back 12

supraorbital and suprathrochlear

Front 13

What nerves are damaged in lateral orbitotomy (2)

Back 13

zygomaticofacial and zygomaticotemporal

Front 14

What nerve is affected in hutchinson's sign during zoster?

Back 14

nasociliary nerve

Front 15

Fracture of the orbital floor or rim may damage what nerve?

Back 15

infraorbital nerve

Front 16

Posterior orbital floor fracture may cause anesthesia where?

Back 16

posterior teeth

Front 17

What nerves carry redundant innervation to the lacrimal gland?

Back 17

zygomatico facial and zygomatico temporal

Front 18

What are the three parts of the orbicularis

Back 18

pretarsal
presepta
orbital

Front 19

What part of the orbicularis is responsible for blinking

Back 19

pretarsal

Front 20

What parts of the orbicularis allow forceful lid closure?

Back 20

preseptal and orbital

Front 21

Where does the orbicularis originate from (3)

Back 21

medial canthal tendon
fronta bone
maxillary bone

Front 22

Where does the superficial tendon of the orbicularis attache (2)

Back 22

anterior lacrimal crest and maxilla

Front 23

What does the deep head of the orbicularis attach to?

Back 23

posterior lacrimal crest

Front 24

Where do the orbicularis fibers from the lateral canthal tendon insert

Back 24

lateral orbital tubercle (Whitnalls)

Front 25

Where do the fibers that innervate the orbicularis run?

Back 25

deep to the muscle

Front 26

6 causes of CN7 palsy

Back 26

trauma
surgery
CN7 tumor
parotid tumor
zoster
Bells palsy

Front 27

What can cause unilateral eyebrow ptosis

Back 27

isolated damage to the nerve supplying the frontalis muscle

Front 28

What two things happen if the orbicularis is paralyzed?

Back 28

widening of the palpebral fissure (loss of tonic contracture)
lagophthalmos (loss of active contracture)

Front 29

Why does tearing occur in CN7 damage

Back 29

compromise of the lacrimal pump

Front 30

In what orientation should the orbicularis be incised?

Back 30

parallel to the muscle fibers (less bleeding and damage)

Front 31

What is a commplication of vertically oritented incision nerar the lateral canthus

Back 31

deinnervation of the pretarsal orbiculars
takes 6wks to reinnervate

Front 32

What will happen in a canthal tendon dehiscence (2)

Back 32

lower lid laxity and possible ectropion

Front 33

Damage to what part of the medial canthal tendon will cause poor apposition of the nasal eyelid to the globe?

Back 33

posterior arm injury

Front 34

What are the 3 segments of the eyebrow?

Back 34

head
body
tail

Front 35

What muscle elevates the nasal 2/3 of the brow and where does it arise from

Back 35

frontalis
from galea fascia

Front 36

What muscle depresses the brow

Back 36

orbicularis

Front 37

What muscle elevates the central brow?

Back 37

corrugators superciliaris
orgin at superomedial orbital rim

Front 38

What muscle draws the brow nasally and inferiorly

Back 38

corrugators

Front 39

What msucle depresses the nasal portion of the eyebrows?

Back 39

procerus muscle

Front 40

Why is ptosis most severe laterally in normal aging?

Back 40

lack of frotalis insertion on the lateral brow

Front 41

What muscles are removed to diminish glabellar brown lines?

Back 41

corrugators and procerus muscles