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MD2S3: Anatomy 203 > Extra-Ocular Muscles > Flashcards

Extra-Ocular Muscles Flashcards

1
Q

What are the muscles of the orbit?

A

Levator Palpebrae Superioris
Superior, Inferior, Medial, Lateral Recti Muscles
Superior Oblique Muscle
Inferior Oblique Muscle

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2
Q

Levator Palpebrae Superioris
Description

A

Thin, triangular muscle

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3
Q

Levator Palpebrae Superioris
It is always active except ____

A

__when the eye is closed__

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4
Q

Levator Palpebrae Superioris
Origin

A

Roof of Orbit above Optic Canal

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5
Q

Levator Palpebrae Superior
Insertion

A

Forms wide aponeurosis inserting into:
Skin of Upper Eyelid innervated by Occulomotor Nerve
Anterior part of Superior Tarsus (muscle fibers called superior tarsal muscle) innervated by sympathetic trunk

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6
Q

Levator Palpebrae Superioris
Action

A

Elevation of upper eyelid

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7
Q

Levator Palpebrae Superioris
Ptosis is caused by

A

Oculomotor Nerve damage
Cervical Sympathetic Trunk damage

Ptosis is a symptom of Horner’s Syndrome

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8
Q

Horner’s Syndrome is caused by …

A

damage of sympathetic nerves of the eye

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9
Q

What are the symptoms of Horner’s Syndrome?

A

Ptosis
Miosis (constriction of pupil)
Anhydrosis

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10
Q

What are the axes of the eyeball?

A

Horizontal Axis
Vertical Axis
Antero-posterior axes

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11
Q

Axes of Eye
What does the horizontal axis divide the eyeball into?

A

Anterior and Posterior

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12
Q

Axes of Eye
What does the vertical axis divide the eyeball into?

A

Medial and Lateral

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13
Q

Axes of Eye
What does the anteroposterior axis divide the eyeball into?

A

Medial and Lateral

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14
Q

Recti Muscles
What are the 4 recti muscles?

A

Superior Rectus
Inferior Rectus
Medial Rectus
Lateral Rectus

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15
Q

Recti Muscles
Origin

A

Common Tendinous Ring surrounding Optic Canal
Junction of Superior and Inferior Orbital Fissure

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16
Q

Recti Muscles
Pathway

A

Run anteriorly and attach anterior to horizontal axis

17
Q

Recti Muscles
Insertion of Medial Rectus

A

Attach to medial side of eyeball anterior to horizontal axis

18
Q

Recti Muscles
Insertion of Lateral Rectus

A

Attach to lateral side of eyeball anterior to horizontal axis

19
Q

Recti Muscles
Insertion of Superior Rectus

A

Attaches to superior side of eyeball anterior to horizontal axis (on medial side)

20
Q

Recti Muscles
Insertion of Inferior Rectus

A

Attaches to inferior side of eyeball anterior to horizontal axis (on medial side)

21
Q

Recti Muscles
Action of Lateral Rectus

A

Abduction

22
Q

Recti Muscles
Action of Medial Rectus

A

Adduction

23
Q

Recti Muscles
Action of Superior Rectus

A

Elevates
Adduction

Reminder: Superior Rectus inserts on medial surface of eyeball enabling adduction

24
Q

Rectus Muscles
Action of Inferior Rectus

A

Depression
Adduction

Reminder: Superior Rectus inserts on medial surface of eyeball enabling adduction

25
Q

Superior Oblique Muscles
Origin

A

Sphenoid Bone Superomedial to Common Tendinous Ring

26
Q

Superior Oblique Muscles
Pathway

A

Passes anteriorly above medial rectus
Ends as round tendon which runs through trochlea

27
Q

Superior Oblique Muscle
Insertion

A

Tendon runs posterolaterally from trochlea and inserts into sclera on superior surface posterior to horizontal axis and lateral to AP+Vertical axes

28
Q

Superior Oblique Muscle
Action

A

Depression
Abduction

29
Q

Inferior Oblique Muscle
Origin

A

Maxilla in floor of orbit lateral to lacrimal groove

30
Q

Inferior Oblique Muscle
Pathway

A

Pass laterally and posteriorly below Inferior Rectus

31
Q

Inferior Oblique Muscle
Insertion

A

Into Sclera inferiorly
Posterior to Horizontal Axis and Lateral to AP and Vertical Axes

32
Q

Inferior Oblique Muscle
Action

A

Elevation
Abduction

33
Q

Cranial Nerves supplying Eye Muscles

A

Occulomotor Nerve
Trochlear Nerve
Abducent Nerve

34
Q

How do the nerves supplying the eye muscles enter the orbit?

A

Superior Orbital Fissure

35
Q

Nerves supplying each muscle

A

SO4(LR6)3:
Superior Oblique: Trochlear
Lateral Rectus: Abducent
Remaining: Oculomotor Nerve

MD2S3: Anatomy 203 (31 decks)

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