MUSCLES OF THE EYEBALL Flashcards by ASIVE PLAATJIE

Q

Muscles that move the eyeball within the orbit

A

Extrinsic muscles

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Q

Muscles that affect the size of the pupil and lens

A

Intrinsic muscles

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Q

Origin of superior oblique

A

Body of sphenoid bone

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Q

Insertion of superior oblique

A

Superior surface of eyeball

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Q

Innervation of superior oblique

A

Trochlear nerve

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Q

Origin of inferior oblique

A

Maxillary bone, lateral to nasolacrimal groove

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Q

Insertion of inferior oblique

A

Inferior surface of eyeball

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Q

Innervation of inferior oblique

A

Oculomotor nerve

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Q

Origin of superior rectus

A

Superior part of common tendinous ring

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Q

Insertion of superior rectus

A

Anterior half of the eyeball, superiorly

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Q

Innervation of superior rectus

A

Oculomotor nerve

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Q

Origin of inferior rectus

A

Inferior part of common tendinous ring

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Q

Insertion of inferior rectus

A

Anterior half of eyeball, inferiorly

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Q

Innervation of inferior rectus

A

Oculomotor nerve

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Q

Origin of lateral rectus

A

Lateral part of common tendinous ring

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Q

Insertion of lateral rectus

A

Anterior half of eyeball, laterally

Q

Innervation of lateral rectus

A

Abducens nerve

Q

Origin of medial rectus

A

Medial part of common tendinous ring

Q

Insertion of medial rectus

A

Anterior half of eyeball, medially

Q

Innervation of medial rectus

A

Oculomotor nerve

Q

Origin of levator palpabrae superioris

A

Lesser wing of the sphenoid bone

Q

Insertion of levator palpabrae superioris

A

Anterior surface of tarsal plate

Q

Innervation of levator plapabrae superioris

A

Occulomotor nerve

Q

Action of superior oblique

A

Depression, Abduction

Q

Action of superior rectus

A

Elevation, Adduction

Q

Action of inferior oblique

A

Elevation, Abduction

Q

Action of inferior rectus

A

Depression, Adduction

Q

Action of lateral rectus

A

Abduction

Q

Action of medial rectus

A

Adduction

Q

Which fibres in the iris decrease the size of the pupil

A

Circular muscles

Q

Which fibres in the iris increase the size of the pupil

A

Radial muscles

Q

What causes the lens to become round(Near vision)

A

Contraction of ciliary body

Q

What causes the lens to become round(Near vision)

A

Contraction of ciliary body

Q

What causes the lens to be flat(Distant vision)

A

Relaxation of ciliary body