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11 Cards in this Set
- Front
- Back
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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SUPERIOR BRANCH OF THE OCULOMOTOR NERVE
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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 |
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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; |
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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) |
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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 |
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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 |
