Orbit & Eyeball Flashcards
name the 7 bones that make up the orbit
- sphenoid
- frontal
- ethmoid
- lacrimal
- palatine
- zygomatic
- maxilla
the orbital axes is approximately ____
45*
the optical axes (direction/line of sight) is ____
parallel
name the contents of the orbit
- eye (eyeball & optic n)
- extra-ocular mm
- lacrimal apparatus
- periorbital fat & fascia
- conjunctiva
- nn & blood vessels
what are the functions of the eyelids?
- protect eyeball & cornea
- spread lacrimal fluid to keep cornea moist
the eyelids are externally covered by ____
skin
what is the name of the mucous membrane that lines the inside of the eyelid and reflects onto the eyeball?
conjunctiva
what is the function of the tarsal (meibomian) glands?
secrete lipids that lubricate edges of eyelids
what is the name of the lubricator glands in the eyelashes? what do they secrete?
ciliary glands
sebaceous secretions
what is the palpebral fissure?
opening between superior & inferior eyelids
what are the medial & lateral palpebral commissures?
where superior & inferior eyelids meet
name the components of the lacrimal apparatus
- lacrimal gland
- excretory ducts of lacrimal gland
- lacrimal canaliculi (small canals)
- lacrimal sac
- nasolacrimal duct
the lacrimal gland secretes ____
lacrimal fluid
what is the dilated superior part of the nasolacrimal duct?
lacrimal sac
the nasolacrimal duct drains into the ____
inferior nasal meatus
where is the lacrimal gland located?
in superolateral part of orbit
where are lacrimal canaliculi located?
near medial angle of eye
what stimulates lacrimal fluid production?
parasympathetic fibers from CN VII
what forms the nerve of the pterygoid canal (Vidian n)? where do these fibers travel to?
- greater petrosal n (pregang) joins deep petrosal n (SNS)
- pterygopalatine ganglion
postganglionic fibers from the pterygopalatine ganglion travel on the ____ nerve to the ____ nerve
- zygomatic (V2)
- lacrimal (V1)
sympathetic fibers from the superior cervical ganglion travel to the internal carotid plexus as the ____ nerve to the ____
deep petrosal n
n of pterygoid canal
a 32-year-old woman undergoes LASIK surgery to improve her vision. To prevent dry eyes during her healing, the surgeon blocks the drainage of tears. Obstruction of what structure prevents tears from draining?
lacrimal canaliculus
name the 2 parts of the anterior segment of the eyeball
anterior & posterior chamber
what makes up the anterior chamber of the eyeball?
cornea to iris/pupil
