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Spiny Dogfish Shark: The Eye
Structures/muscles of the eye and their functions
19
Biology
Undergraduate 1
02/27/2011

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Term
Superior oblique muscle
Definition
runs on top, originates anteriorly
Term
Inferior oblique
Definition
runs underneath, originates anteriorly
Term
Superior rectus
Definition
Attaches to top, originates posteriorly
Term
Inferior rectus
Definition
Attaches on bottom, originates posteriorly
Term
Medial rectus
Definition
runs horizontally along back of eye
Term
Lateral rectus
Definition
attaches to the most posterior side of eye
Term
Nerve No. II
Definition
Optic nerve; enters back of eye
Term
No. III
Definition
Oculomotor nerve; connects to inferior oblique
Term
No. IV
Definition
Trochlear nerve
Term
No. VI
Definition
Innervates lateral rectus
Term
Infraorbital
Definition
runs underneath eye, forks into 2 at anterior
Term
conjunctiva
Definition
outermost, transparent layer of eye
Term
sclera
Definition
thick white, grayish layer on back of eye
Term
cornea
Definition
directly behind conjunctiva, also transparent
Term
choroid
Definition
thin black layer inside sclera
Term
iris
Definition
dark pigmented layer that encircles pupil
Term
pupil
Definition
opening in iris that lets in light
Term
retina
Definition
innermost surface on back of eye, grayish
Term
lens
Definition
round circular ball, helps to focus light onto retina
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