orbit Flashcards
palpebral conjunctiva attaches to the eyeball at the
junction of cornea and sclera
medial rectus m
- action: in
- nerve: CN3
sensory innervation to eye
-can go either through ciliary ganglion or through long ciliary n (combined with nasociliary n fibers)
lipid secretion in the eyelid
tarsal glands embedded in tarsus
three ways that inferior ophthalmic v can drain
1) join superior ophthalmic v
2) cavernous sinus
3) pterygoid plexus of veins
what two nerves supply the lacrimal gland
- zygomatic n (carrying fibers from greater petrosal and deep petrosal)
- lacrimal n (CNV1)
lacrimal a supplies
- lacrimal gland
- mm, conjunctive, and lateral sides of eyelid
inferior rectus m
- action: down and in
- nerve: CN3
lateral rectus m
- action: out
- nerve: CN6**
inferior oblique m
- action: up and out
- nerve: CN3
superior rectus m
action: up and in
innervation: CN3
superior tarsal m
- origin: levator palpebrae superioris m
- insertion: superior tarsus
- innerv: superior cervical ganglion (travel with ophthalmic a)
superior venous drainage of eyes is into
cavernous sinus
nerve innervation to lacrimal gland
- greater petrosal + deep petrosal = nerve to pterygoid canal
- synapse at PP ganglion
- fibers travel with zygomatic n (CNV2)
- branch of zygomatic n joins lacrimal n
superior oblique m
- action: down and out
- nerve: CN4***
levator palpebrae superioris m
- origin: lesser wing of sphenoid
- insertion: superior tarsus and skin of upper eyelid
- action: raises upper eyelid
- nerve: CN 3
eyelids are covered externally by ___ and internally by ___
externally by skin and internally by palpebral conjunctiva
lesion to superior cervical ganglion results in
partial drooping (ptosis) of eyelid
anterior ethmoidal a (branch of ophthalmic a) supplies
- frontal sinus
- ethmoidal cells
- medial and lateral wall of nasal cavity
- external nasal a: dorsum and ala of nose
parasymp innervation to eye
oculomotor
supra-orbital a (branch of ophthalmic a) supplies
- upper eyelid
- forehead
- scalp to vertex
supra-orbital v and infra-orbital v drain by
facial v or superior ophthalmic v
3 branches of CNV1
- frontal n
- nasociliary n
- lacrimal n
posterior ethmoidal a (branch of ophthalmic a) supplies
- ethmoidal cells
- sphenoidal sinus
- lateral wall of nasal cavity
- septum
symp innervation to eye
- from symp cervical ganglion
- can go either through ciliary ganglion or through long ciliary n (combined with nasociliary n fibers)
what passes through superior orbital fissure and through the common tendinous ring
- oculomotor n (CN3)
- nasociliary n
- abducens n (CN6)
what two muscles are found in the upper eyelid
1) levator palpebrae superioris m
2) superior tarsal muscle
which nerves and vessels pass through the superior orbital fissure but not through the common tendinous ring
- frontal n
- lacrimal n (CN V1)
- superior ophthalmic v
- trochlear n (CN4)
lesion to the superior tarsal m results in
partial drooping (ptosis) of eyelid
lesion to ocolomotor may result in what to the upper eyelid
drooping (ptosis) of the upper eyelid
supratrochlear a (branch of ophthalmic a) supplies
- upper eyelid
- forehead
- scalp (medially)
ophthalmic a is a branch of
ICA
