Orbit A

Question 1

Orbitial cavities, lateral walls are at ___ degrees of each other

Answer 1

90 degrees

Question 2

Orbital cavities ASR’s of orbital diverge at ___ degrees

Answer 2

45 degrees

Question 3

Optical axes=

Answer 3

Axes of gaze

Question 4

Optical axes are ___

Answer 4

Parallel

Question 5

2 bones, roof of orbit:

Answer 5

Lesser wing of sphenoid

Orbital plate of frontal bone

Question 6

3 bones, lateral wall of orbit

Answer 6

Zygomatic process of frontal bone
Greater wing of sphenoid bone
Orbital surface of zygomatic bone

Question 7

4 bones, medial wall of orbital fissure:

Answer 7

Sphenoid body
Orbital plate of ethmoid bone
Frontal process of maxilla
Lacrimal bone

Question 8

3 bones of floor of orbit

Answer 8

Orbital process of palatine bone
Orbital surface of maxillary bone
Zygomatic bone

Question 9

Base of the orbit is outlined by:

Answer 9

Orbital margin that surrounds the orbital opening

Question 10

Orbital margin provides attachment for:

Answer 10

Orbital septum

Question 11

The ____ is a paper thin portion of the ethmoid bone

Answer 11

Lamina papyracea

Question 12

Orbital compression injury breaks the lamina papyracea and injuries the communication between nasal cavity and orbit through the ethmoid sinus. This results in ____

Answer 12

Orbital emphysema

Question 13

Fissure located between orbital floor and lateral wall:

Answer 13

Inferior orbital fissure

Question 14

Fragments from an injury leading to orbital emphysema can tear ___ nerve

Answer 14

Optical N—CN II

Question 15

The apex of orbital canal contains ___ nerve and ___ artery

Answer 15

Optic N—CN II

Ophthalmic artery

Question 16

Superior orbital fissure holds which nerves?

Answer 16

Oculomotor N (CN III)
Trochlear N (CN IV)
Trigeminal, Ophthalmic N ( CN V1)
Abducens N (CN VI)

Question 17

Superior orbital fissure vein:

Answer 17

Ophthalmic vein

Question 18

Ophthalmic vein drains mainly into:

Answer 18

Cavernous sinus

Question 19

Periosteum of orbit =

Is continuous with ___ which formed the fasciae sheath of the eyeball=

Answer 19

Periorbita

Tenon’s capsule

Question 20

Palpebral portion of orbicularis oculi muscle is innervated by:

Answer 20

Facial N (CN VII)

Question 21

Paralysis of palpebral portion of facial nerve = ___

And results in inability of ____

Answer 21

Bell’s palsy

Close the eyelids

Question 22

Levator palpebrae superioris M is innervated by:

Answer 22

CN III— oculomotor N

Superior division

Question 23

Contraction of superior tarsal M produces:

Lack of muscle tone of superior tarsal muscle =

Answer 23

“Wide eyed fear”

“Tired eyes”

Question 24

3 main symptoms of Horner’s syndrome:

Answer 24

Ptosis
Miosis
Enophthalmos

Question 25

Ptosis=

Answer 25

Drooping of upper eyelid

Question 26

Miosis=

Answer 26

Constricted pupil

Question 27

Enophthalmos=

Answer 27

Impression that eye is sunk in

Question 28

Tarsal glands (meibomian) produce oil to ___ lids

Answer 28

Lubricate inner surface of eye lids

Question 29

Infected sebaceous glands in the palpebral margins =

Answer 29

Sty

Question 30

Corneal blind reflex testing allows us to test afferent portion of ___ and efferent portion of ___

Answer 30

CN V— Trigeminal

CN VII— Facial

Question 31

Movement of eyelids will ___ the lacrimal gland

Answer 31

Milk

Question 32

Eye surface not covered by conjunctiva:

Answer 32

Cornea

Question 33

Corona and anterior sclera protect by:

Answer 33

Bublar conjunctiva

Question 34

Corneal blink reflex tests ___ of CN V and efferent portions of CN ___

Answer 34

Afferent

CN VII

Question 35

Corneal blink reflex tests afferent portion of CN ___ and ___ portion of CN VII

Answer 35

CN V

Efferent

Question 36

Corneal blink reflex:

If both eyes blink when right eye is touched by not when left eye is touched, problem is the ___ nerve

Answer 36

Left trigeminal

Question 37

Corneal blink reflex:

If one the right eye blinks when either eye is touch ___ nerve affected

Answer 37

Left facial

Question 38

2 portions of lacrimal gland, the gland is actually bisected by tendon of ___. Lacrimal ductules are formed at the ___ portion of lacrimal gland

Answer 38

Levator palpebrae

Inferior portion