Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
48 Cards in this Set
- Front
- Back
|
what lines the bones of the orbit
|
periorbita (periosteum)
|
|
|
what are the 7 bones of the orbit
|
palatine
zygomatic maxillary lacriminal ethmoid frontal sphenoid |
|
|
the Orbit has 4 walls an apex and a base. What forms the superior wall
|
the frontal and lesser wing of spenoid bones
|
|
|
where is the lacriminal gland located
|
the lacriminal fossa of the orbit
|
|
|
the Orbit has 4 walls an apex and a base. What forms the medial wall
|
ethmoid, frontal, lacriminal, and spenoid bones.
|
|
|
what is contained on the medial wall of the orbit
|
the fossa for the lacrimal sac and nasolacrimal duct
|
|
|
the Orbit has 4 walls an apex and a base. What forms the base (floor)?
|
maxilla, zygomatic and palatine bones
|
|
|
the Orbit has 4 walls an apex and a base. What forms the lateral wall?
|
Zygomatic and spenoid bones
|
|
|
the Orbit has 4 walls an apex and a base. where is the apex located ?
|
at the optic canal and lesser wing of the sphenoid
|
|
|
why can the orbit fracture so easily
|
because the walls are so thin especially the medial and inferior walls.
|
|
|
what is exopthalmus and what causes it?
|
protrusion of the eyeball
caused by an orbital tumor pushing into the orbit |
|
|
what nerve would an orbital tumor press against
|
the optic nerve
|
|
|
what covers the lids inside?
|
conjunctiva
|
|
|
what forms the skeletin of the lids?
|
the tarsal plates
|
|
|
what is embedded in the tarsal plates and what do they do
|
taral glands and they sucrete lipid material
|
|
|
what is the large sebacious gland of teh eyelid
|
ciliary gland
|
|
|
what muscle of the eye raises the eyelid
|
the levator palpabrae superioris
|
|
|
what muscle of the eye aids in blinking and shutting the eyelid
|
the orbicularis oculi
|
|
|
you are putting on macara and need to keep your eyelid wide open. What muscle helps you do that?
|
levator palpabrae suprioris
|
|
|
what stimulates the lacrimal gland
|
parasympahtetic nerves of CNVII
|
|
|
where do the ducts of the lacrimal gland open up to
|
superior conjunctive fornix
|
|
|
describe the flow of tears
|
starts from lacrimal gland and opens in the sup conjctv fornix, into lacrimal lake, into lacrimal caniculi, into the lacimal sac and finally down the nasolacriminal duct
|
|
|
why does your nose have to be blown when you cry
|
the nasolacriminal duct extends inferiorly into the nose and open at the inferior meatus of the nasal cavity!
|
|
|
what are the extraocular muscles of the eye
|
supior, medial lateral and inferior recctus, supior & Inferior oblique and levator palpabrae
|
|
|
you see a cute guy sitting right next to you but you don't move your head to look, just your eyes. what muscle moves your eye laterally? and medially? what nerve innervates these muscles?
|
laterally--lateral rectus CN VI
medially--medial rectus CN III |
|
|
where do the three terminal branches of the opthalmic enter the orbit
|
the superior orbital fissure
|
|
|
what type of innervation do the three branches of the opthalmic nerve supply to the ant orbit (lacrimal gland, and eylids) face and scalp????
|
SENSORY
|
|
|
what are the three branches off the opthalmic nerve
|
frontal, lacrimal, and nasocilliary nn
|
|
|
*****whats the difference b/w the innervation of the Long ciliary nasocilliary nerv and the short one?
|
long one passes thru to eyeball WITHOUT entering the cilliary ganglion!!!!! the short one does and picks up postganglionic parasympathetic fibers
|
|
|
what are the 5 nerves of the orbit
|
optic n--CN 2, Opthalmic division of CN 5, Oculomotor, trochlear, and abducens
|
|
|
what is the largest branch of the opthalmic located superficial to the levator palpebrae superioris?
|
the Frontal N
|
|
|
what are the two branches of the Frontal Nerve
|
Supraorbital and Supratrochlear
|
|
|
what is the smallest branch of the opthalmic that enters the orbit thru the superior orbital fissure?
Is it sensory or motor |
the Lacriminal N
Sensory to the lacriminal |
|
|
what nerves are sensory to the orbit and which are motor?
|
sensory: the nerves of the opthalmic division (frontal, lacriminal, nasocilliary)
Motor: oculomotor, trochlear and abducens |
|
|
Oculomotor nerve
|
supplies motor to all muscles of the orbit except later rectus and sup oblique
|
|
|
trochlear nerve
|
motor n to the sup obliqu muscle
|
|
|
abducens nerve
|
motor nerve to the lateral rectus
|
|
|
where do parasympathetic fibers of the ANS enter the orbit
|
from the smooth muscle of the brainstem and enter the oculomotor nerve which carries the preganglionic fibers into the orbit
|
|
|
Once inside the orbit how do preganglionic parasympathetic fivers leave CN III?
|
its motor root
|
|
|
where do the pregangionic parasympathetic neurons terminate and the postganglionic neurons begin?
|
the ciliary ganglion--located in the orbit along the posteriorlateral side of Optic N.
|
|
|
how do the POSTganglionic fibers leave
what do the parasympathetic fibers supply? |
shot short cilliary nerves to the eyeball.
they supply the smooth muscles of the eyeball |
|
|
How do the SYPMATHETIC fibers get into the orbit
|
they enter from the superior cervical ganglion on the blood vessels
|
|
|
what is the artery that supplies blood to the orbit and what vein drains blood away from it?
|
the opthalmic artery and vein
|
|
|
how does the opthalmic artery get into the orbit
|
through the optic canal
|
|
|
what are the branches of the opthalmic artery
|
supraorbital a
supratrochlear a lacriminal a central artery of the retina |
|
|
what are the branches of the opthalmic vein
|
superior and inferior opthalmic vein
|
|
|
what do the superior and inferior opthalmic veins pass through?
|
superior orbital fissure --and into the cavernous sinus inside the skull.
|
|
|
a pt presents with impaired vision and protrusion of her eye balls (exopthalmos). what is a likely cause of this
|
a tumor growing in her sphenoid sinus that is pressing on the optic nerve and back of eyeball
|
