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24 Cards in this Set
- Front
- Back
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What nerve comes out of supraorbital foramen? |
supraorbital n (V1) |
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What nerve comes out of optic canal? |
Optic nerve (CN II) |
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What nerves come out of superior orbital fissure? |
V1 (Lacrimal and frontal above, nasociliary below) Trochlear n (CN IV) Oculomotor nerve (CN III) Abducens nerve (CN VI)
(III, IV, V1, and VI) |
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What nerve comes out of infraorbital groove and canal? |
Infraorbital n (V2) |
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What nerves come out of inferior orbital fissure? |
maxillary and zygomatic nerves (V2) |
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Where does inferior oblique originate? |
anteromedial aspect of orbital floor |
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intorsion |
rotate toward nose |
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extorsion |
rotate toward ear |
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Action and innervation: levator palpebrae superioris |
oculomotor III
elevate upper eyelid |
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Action and innervation: medial rectus |
oculomotor III
adduction |
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Action and innervation: lateral rectus |
abducens VI
abduction |
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Action and innervation: superior rectus |
oculomotor III
1) elevation 2) intorsion 3) adduction |
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Action and innervation: inferior rectus |
oculomotor III
1) depression 2) extorsion 3) adduction |
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Action and innervation: superior oblique |
trochlear IV
1) intorsion 2) depression 3) abduction |
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Action and innervation: inferior oblique |
oculomotor III
1) extorsion 2) elevation 3) abduction |
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Recti and obliques insertion points |
Recti inserted anterior and obliques inserted posterior to vertical (sup-inf) axis
Recti originate posterior and medial to insertions on eyeball
Obliques originate anterior and medial to insertions on eyeball |
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angle of superior and inferior recti |
23 degrees from midline |
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lateral vs. medial gaze: which muscles predominate? |
obliques predominate during medial gaze, recti during lateral gaze |
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Action and innervation: sphincter pupillae |
constricts pupil
parasympathetic oculomotor nerve ciliary ganglion |
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Action and innervation: dilator pupillae |
dilates pupil
sympathetic T1 superior cervical ganglion |
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Action and innervation: ciliary muscle |
rounds lens (accommodation for near vision)
parasympathetic oculomotor nerve ciliary ganglion |
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autonomic innervation of orbit: parasympathetic |
oculomotor - ciliary ganglion - short ciliary n sphincter pupillae = constricts pupil ciliary muscle = rounds lens for accommodation
facial - great petrosal nerve - nerve of pterygoid canal - pterygopalatine ganglion - zygomatic n (V2) - lacrimal n (V1) = lacrimal gland, tearing
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autonomic innervation of orbit: sympathetic |
T1 spinal cord level - superior cervical ganglion - internal carotid plexus ciliary nerves - dilator pupillae = dilates pupil oculomotor n - superior tarsal muscle = elevates upper eyelid ophthalmic artery = vasoconstriction |
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miosis |
constriction of pupil |
