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From Flashcardlet > the orbit > Flashcards

the orbit Flashcards

1
Q

what are the 3 margins of the bony orbit?

A

frontal, zygomatic, and maxilla

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2
Q

the roof is formed by?

A

the orbital plate of the frontal bone

also post lesser wing of sphenoid

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3
Q

what forms the medial wall

A

the lamina paprycea of ethmoid, lacrimal, maxilla, and frontal

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4
Q

supraorbital formamen/notch have what passing thru?

A

supraorbital VAN

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5
Q

what passes thru the infraorbital groove

A

infraorbital VAN

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6
Q

lacrimal fossa/ groove is located where?

and contais what

A

it is located between the ant and post lacrimal crests

it contains the lacrimal sac

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7
Q

what is the purpose of the lacrimal sac

A

gets filled with tears

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8
Q

when u insert a probe downwards from the lacrimal fossa, u go thru the nasolacrimal canal that contains the nasolacrimal duct. what is the significance?

A

it is why u get a runny nose when u cry

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9
Q

what is the diff between the fossa for lacrimal gland and the lacrimal fossa for the lacrimal sac?

A

the gland secretes tears, the sac collects them

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10
Q

what passes thru the inferior orbital fissure>

A

maxillary nerve and inf, ophthalmic vein.

communicates with the pterygopalatien fossa

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11
Q

where is the superior orbital fissure located

A

between the greater and lesser wings of the the sphenoid

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12
Q

what are the 3 branches of the ophthalmic nerve?

A

NFL

nasocilliary, frontal, and lacrimal

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13
Q

what passes thru the superior orbital fissure?

A

ophthalmic n (NFL), abducent, oculomotor, trochlear, and sup. ophthalmic vein

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14
Q

what passes thru the optic canal?

A

optic n, and ophthalmic artery

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15
Q

the zygomaticotemporal and zygomaticofacial foramina are located on what wall?

A

lateral

have nerves of the same name passing thru

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16
Q

the ant and post ethmoidal foramina are located on what wall?

A

medial

nerves of same name pass thru

17
Q

what separates the upper and lower eyelids?

A

palpebral fissures

18
Q

what is the name of the area where the lat and med portions of the eyelids meet called?

A

canthus

19
Q

what 3 glands are in the eyelids?

A

sebaceous= glands of zeiss
sweat glands= ciliary glands of Moll
modified sebaceous= tarsal/ meibomian glands

20
Q

what gland secretes a fluid that allows the eyelids to stay air tight?

A

meibomian glands

21
Q

a stye or external hordelum is caused by what?

A

inflammation of glands of moll or zeis

22
Q

a chalazion or internal hordeolum is caused by?

A

inflammation of tarsal/ meibomian glands

23
Q

tears collect in the lacrimal lake and drain into?

A

lacrimal punctum

24
Q

what is the elevated part in the middle of the lacrimal lake?

A

lacrimal caruncle

25
Q

small elevation on the medial end of each eyelid

A

lacrimal papilla

26
Q

opening in the papilla=

A

lacrimal puncta

27
Q

ech punctum leads to what?

A

a sup and inferior lacrimal canal

28
Q

what are the layers of the eyelid, starting with outermost

A 
skin
superficial fascia (orbicularis oculi muscle)
tendon for levator palpebrae
tarsal plate (tough fibrous tissue with tarsal glands)
palpebral conjunctiva (mucous membrane)
29
Q

the function of the orbicularis oculi ( facial nerve)

A

close eyelid

30
Q

what opens/ raises the upper eyelid?

A

levator palpebrae superioris
occulomotor nerve
also the superior tarsal muscle (symp)

31
Q

lefaro ptosis is caused by?

A

lesion of oculomotor nerve.
causes drooping of eyelid
MAJOR PTOSIS

32
Q

facial nerve palsy causes

A

lagothalmos, cant close eye cuz it supplies the orbicularis oculi

33
Q

superior tarsal muscle is supplied by

A

cervical sympathetic chain

34
Q

horners syndrome

A

damage to cervical symp chain, wont be able to contract superior tarsal muscle.
MINOR PTOSIS
cant sweat on face, will have opposite effects of the symp, so blushing and vasodilation

35
Q

symptoms of horners ( damage to symp cervical chain)

A 
anhydrosis (no sweat)
minor ptosis
cutaneous vasodilation, 
miosis (constriction of pupils)
enopthalmos (sinking of eyeball)
36
Q

this is a remnant of the nictitating membrane (3rd eyelid in reptiles)

A

semilunar fold

lateral edge of the lacrimal lake

37
Q

the superior salivary nucleus contains?

A

pre gg. parasymp cell bodies

38
Q

the pre gg parasymp fibers from salvatory nucleus run with the facial nerve and then join with the greater petrosal. the greater petrosal join with what?

A

deep petrosal (post gg. symp)

39
Q

greater petrosal + deep petrosal=

A

nerve of ptyergoid canal

From Flashcardlet (13 decks)

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