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11 Cards in this Set

  • Front
  • Back
frontal nerve
lacrimal nerve
trochlear nerve

HOW DO THEY COURSE?
A. Nerves which course between the periorbita and retrobulbar space after
entering the orbit through the superior orbital fissure, superior to the com-
mon annular tendon
FRONTAL NERVE

-branches from?
-courses superior to?
-divides into?
--through what holes
--cutaneous innervation to?
1. Frontal nerve: branches from the ophthalmic nerve near the superior
orbital fissure and courses anteriorly, superior to levator palpebrae
superioris; near the middle of the orbit it divides into the supraorbital
and supratrochlear nerves, which emerge through the supraorbital fora-
men and frontal notch, respectively, and provide cutaneous innervation
to the forehead and scalp
LACRIMAL NERVE

*branches from the...
*superior to the...
2. Lacrimal nerve

a. Branches from the ophthalmic nerve near the superior orbital fissure
and courses anteriorly, superior to the lateral rectus
LACRIMAL NERVE

*receives a branch from the...
*containing what type of fibers? from where? for the?

THEREAFTER, the lacrimal nerve provides cutaneous innervation to.....
b. Receives a branch from the zygomaticotemporal nerve containing
postganglionic parasympathetic secretomotor fibers from the ptery-
gopalatine ganglion for the lacrimal gland; after supplying the lac-
rimal gland with postganglionic parasympathetic secretomotor
fibers, the lacrimal nerve pierces the orbital septum to provide cuta-
neous innervation to the lateral part ofthe upper eyelid
TROCHLEAR NERVE

-courses how?
-superior to the?
-penetrates what? innervates?
3. Trochlear nerve: courses medially, superior to the posterior end of levator
palpebrae superioris; penetrates the superior aspect ofthe superior ob-
lique and innervates it
1. Superior branch ofthe oculomotor nerve

2. Inferior branch ofthe oculomotor nerve

3. Abducens nerve

4. Nasociliary nerve
B. Nerves entering the retrobulbar space through the superior orbital fissure
and common annular tendon
SUPERIOR BRANCH OF THE OCULOMOTOR NERVE
1. Superior branch ofthe oculomotor nerve: the oculomotor nerve divides
into a superior and an inferior branch near the superior orbital fissure;
the superior branch courses superiorly to innervate the superior rectus
and levator palpebrae superioris
INFERIOR BRANCH OF THE OCULOMOTOR NERVE

-gives off the...
-innervates?
2. Inferior branch ofthe oculomotor nerve

a. Gives off the oculomotor root of the ciliary ganglion and then courses
anteriorly to innervate the medial rectus, inferior rectus, and infe-
rior oblique;
INFERIOR BRANCH OF THE OCULOMOTOR NERVE

-oculomotor root of the ciliary ganglion contains...
2. Inferior branch ofthe oculomotor nerve

the oculomotor root of the ciliary ganglion contains
preganglionic parasympathetic fibers from the Edinger-Westphal
nucleus in the brainstem for synapse on postganglionic parasympa-
thetic cell bodies in the ciliary ganglion (branches ofthe nasociliary
nerve and internal carotid plexus form the nasociliary and sympa-thetic roots ofthe ciliary ganglion, respectively; they pass through
the ciliary ganglion without synapse)
INFERIOR BRANCH OF THE OCULOMOTOR NERVE

-CILIARY GANGLION
b The ciliary ganglion is about 2 millimeters in diameter and located
' between the optic nerve and lateral rectus about 1 centimeter ante-
rior to the apex ofthe orbit
INFERIOR BRANCH OF THE OCULOMOTOR NERVE

-what enters the eye near the optic nerve
-what do they supply?
c From the ciliary ganglion, postganglionic parasympathetic fibers
course anteriorly via the short ciliary nerves and enter the eye near
the optic nerve; they supply the ciliary and sphincter pupillae muscles
which focus the lens and constrict the pupil, respectively