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10 / 26

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external fibrous coat: sclera + cornea

cornea: more convex

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middle or vascular coat: choroids, ciliary body, iris, blood vessels, ciliary nerves

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retinal coat

outer pigmented layer

inner nervous tissue layer

optic nerve and retinal vessels enter and leave at optic papilla/disc

where fibers of optic nerve pierce sclera, choroids and outer retinal layer

blind spot

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b/w cornea and lens: aqueous humor

eyeball of bull

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four refractive media

cornea

aqueous humor

lens

vitreous humor

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retina held in place and applied to choroid by vitreous body

o

choroid is bound to sclera at two places

where optic nerve pierces

where vorticose veins leave it near equator to pierce sclera (bull only)

o

retina ends anterior to equator in scalloped margin, ora serrata

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anterior to ora serrata: ciliary zone

ciliary body contains ciliary muscle and ciliary processes

ciliary processes converge on equator of lens for accommodation

lens suspended by zonular fibers

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anterior chamber: b/w cornea and irisfilled with aqueous humor

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posterior chamber

bounded anteriorly by iris, posteriorly by lens and zonular fibers, laterally by ends of ciliary processes

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anterior surface of lens, less curved than posterior surface

Posterior Triangle of Neck

boundaries

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anterior: posterior border of sternocleidomastoid

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posterior: anterior border of trapezius

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inferior: middle third of clavicle

fascial roof: deep fascia b/w two boundary muscles

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@ inferior border of triangle, external jugular vein pierces roof and then lies deep to it

floor of triangle: anterior continuation of prevertebral fascia

platysma: covers basal part of triangle and over entire clavicle

supraclavicular nerves: cling to deep surface of platysma

nerves from posterior border of SCM

o

accessory nerve

slightly superior to middle of posterior border of sternocleidomastoid

slightly superior to clavicle at anterior border of trapezius

exits jugular foramen with internal jugular vein

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lesser occipital nerve (C2, C3)

emerges from posterior border of SCM near accessory

goes along posterior border of SCM

supplies scalp

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Great auricular nerve (C2, C3)

w/external jugular vein, ascends vertically on surface of SCM

supplies back of auricle and cutaneous area from angle of mandible to mastoid process

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Transverse cervical nerve (C2,C3)

Crosses middle of SCM transversely

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