BIOL 1004 Lecture Notes - Sightline, Medial Rectus Muscle, Inferior Oblique Muscle

6 views4 pages
Published on 28 Jan 2013
Anatomy of the Eye and Eye Movements
I. Anatomy
a. Walls of orbit
i. Pyramidal shaped; twice as deep as wide;
ii. 45 degree angle between orbits; eyeball occupies only anterior half
iii. lots of blood vessels and fat
1. shock absorber, cushion, lubricant, protects nerves/vessels
2. last place that fat pads will disappear in body
iv. floor: maxilla, zygomatic, palatine
v. medial: ethmoid, lacrimal, frontal (ethmoid =fragile bone, paper thin)
vi. roof: frontal, sphenoid
vii. lateral: zygomatic, sphenoid
b. Orbital foramina
i. optic canal: holds optic nerve and ophthalmic artery
ii. superior orbital fissure: CN III, IV, V1, VI, ophthalmic veins (sup/inf)
ophthalmic veins communicate w/ cavernous sinus and facial vein
iii. inferior orbital fissure: CN V2 from foramen rotundum
iv. ethmoidal foramina: ethmoidal nerves pass thru medial wallnasal nn.
v. fossa for lacrimal sac and nasolacrimal canal (inferomedial)
c. Lacrimal gland
i. superolateral part of orbit
ii. sensory innervation: Trigeminal (CN V1)
iii. parasymp. innervation: pteryogoid ganglion of facial nerve (secretomotor)
iv. Path of tear drainage:
olacrimal gland canals conjunctival sac on surface of eyeball
surface of eye lacrimal puncta (in papillae) canalicula
lacrimal sac nasolacrimal duct
d. Conjunctiva: mucosa that covers eyelid and goes onto sclera of eye
i. rich with blood vessels; gets inflamed (drinking or irritation)
e. Eyelids: protective skin flaps
i. Muscles
1. levator palpebrae superioris
oMotor Innervation: CN III
oFxn: opening superior tarsus
oassisted by superior tarsal muscle
2. Orbicularis Oculi
a. Motor Innervation: CN VII
b. Fxn: Blinking and tightly closing eye
ii. Tarsus (superior and inferior) with tarsal glands (mybomium glands)
1. Glands open up on inner surface of eyelid
2. Secrete lipid => prevents eyelids from sticking together
3. Under hormonal control: sebaceous gland
4. Duct can get clogged cyst
iii. Ciliary glands associated with eyelashes (cilia): superficial
1. When clogstye
Unlock document

This preview shows page 1 of the document.
Unlock all 4 pages and 3 million more documents.

Already have an account? Log in

Get OneClass Notes+

Unlimited access to class notes and textbook notes.

YearlyBest Value
75% OFF
$8 USD/m
$30 USD/m
You will be charged $96 USD upfront and auto renewed at the end of each cycle. You may cancel anytime under Payment Settings. For more information, see our Terms and Privacy.
Payments are encrypted using 256-bit SSL. Powered by Stripe.