Extrinsic Eye Muscles

9 cards
Extrinsic Eye Muscles

Muscle Locati On And F

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Explain the origin of the term extrensic eye muscles? Why is it entitled such?
They are termed extrensic because they originate within the orbit and insert onto the white outer surface of the eye (the sclera)
What is the relation between the muscle name and its location?
Their name derives from the location of their insertion on the anterior part of the sclera. ie; medial, lateral, inferior, superior
What is the function of the medial rectus? Where is it located?
The medial rectus attaches to the anterolateral surfaceof  the eye and pulls it medially (ADDUCTION)
When your right eye looks to the right, which extrinsic eye muscle is contracted?    
The lateral recuts, attached to the anterolateral surface of the eye is contracted and pulls eye laterally. It is used to make your right eye look to the right (ABDUCTION)
Name the location and function of the inferior rectus    
The inferior rectus attaches to the anteroinferior part of the sclera and pulls the eye inferiorly and medially. i.e when you look down i.e when you look at your nose
This muscle is pulls your eye superiorly and slightly medially
The superior rectus (just as the inferior rectus) does not pull directly parallel to the long axis resulting in its slight medial pull
Label this diagram

This muscle elevates the posterior part of the eye and turns the eye laterally
The superior oblique depresses the eye and turns it laterally. It passess through a pulley-like loop called the trochlea
Name the location and function of the inferior oblique
The inferior oblique elevates eye. Located at inferior posterior part of eye. Contracting the muscle pulls the posterior part inferior