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Anatomy wk 7 -11 > The orbit > Flashcards

The orbit Flashcards

1
Q

Bones of orbit surrounding outside-

A

Frontal, zygomatic, maxilla

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2
Q

Bones in wall of orbit

A

Ethmoid, lacrimal, superior orbital fissure, sphenoid - greater wing and lesser wing, optic canal

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3
Q

Orbit contents

A

Eyeball, Fat and connective tissue, Extraocular muscles, nerves and blood vessels

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4
Q

Tarsal Plates

A

Dense C/T
Support eyelid
Glands

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5
Q

Ligaments of eye

A

Medial check ligaments
Lateral check ligaments
Suspensory ligaments

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6
Q

Suspensory ligaments

A

Support eyeball

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7
Q

Check ligaments

A

Restrict medial and lateral recti

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8
Q

Cornea

A

Fibrous layer outercoat

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9
Q

Sclera

A

Fibrous layer outercoat

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10
Q

Retina

A

Inner layer / coat

Rods and cones

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11
Q

Vascular layer - middle coat

A

Iris
Ciliary body
Choroid

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12
Q

Retina

A

rods and cones
blind spot =optic disc
Macula Lutea = Fovea

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13
Q

Aqueous humour

A

Anterior to lens, helps maintain intra-ocular pressure
Made by ciliary body, drain into corneo- scleral junction
(canal of schlemm)

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14
Q

Vitreous humour

A

Embryological jelly
Transparent jelly
Posterior to lens
supports the retina

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15
Q

intraocular (intrinsic) muscles

A

Dilator pupillae

Sphincter pupillae

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16
Q

Dilator pupillae

A

increases diameter of pupil

sympathetic, carried on blood vessels

17
Q

Sphincter pupillae

A

decreases the diameter of

parasympathetic via oculomotor nerve CN III

18
Q

ciliary muscle in the absence of nerve stimulation

A

ciliary muscle relaxed
zonular fibres are under tension
lens is stretched thin to refract light for distant vision

19
Q

Ciliary muscle under parasympathetic stimulation

A

ciliary muscle contract
zonular fibres relax
In the absence of stretching internal tension causes lens to become more spherical (thicker) to refract light for near vision

20
Q

7 extraocular muscles

A

levator palpebrae superioris from orbital roof to upper eyelid
Superior, inferior, medial and lateral recti from annular ring to sclera (anterior to sclera)

Superior oblique (lesser wing sphenoid) and inferior oblique (orbital floor) to sclera (posterior equator)

Anatomy wk 7 -11 (8 decks)

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