How do you find the function of the inferior oblique muscle?
It occupies the inferior aspect of the orbit, encircling the lower portion of the eyeball. The primary action of this muscle is to elevate and abduct (laterally move) the eyeball….Inferior oblique muscle.
| Origin | Orbital surface of maxilla |
|---|---|
| Action | Abducts, elevates, externally rotates eyeball |
| Innervation | Oculomotor nerve (CN III) |
Does the inferior oblique move the eye up or down?
The superior rectus and inferior oblique muscles primarily move the eye upward. The inferior rectus and superior oblique muscles primarily move the eye downward. The lateral rectus moves the eye horizontally laterally (abduction). The medial rectus muscle moves the eye horizontally medially (adduction).
What is the function of each of the two oblique muscles of the eye?
The primary (main) action of the superior oblique muscle is intorsion (internal rotation), the secondary action is depression (primarily in the adducted position) and the tertiary action is abduction (lateral rotation). The extraocular muscles rotate the eyeball around vertical, horizontal and antero-posterior axes.
What muscle moves the eye up and laterally?
The superior rectus is an extraocular muscle that attaches to the top of the eye. It moves the eye upward. The inferior rectus is an extraocular muscle that attaches to the bottom of the eye.
Where is the inferior oblique muscle located in the eye socket?
the orbit
The inferior oblique muscle or obliquus oculi inferior is a thin, narrow muscle placed near the anterior margin of the floor of the orbit. The inferior oblique is one of the extraocular muscles, and is attached to the maxillary bone (origin) and the posterior, inferior, lateral surface of the eye (insertion).
What muscles move the eye up and down?
The superior rectus is an extraocular muscle that attaches to the top of the eye. It moves the eye upward. The inferior rectus is an extraocular muscle that attaches to the bottom of the eye. It moves the eye downward.
What muscle turns the eye up and laterally?
The lateral rectus muscle is an abductor and moves the eye laterally, and side to side along with the medial rectus, which is an adductor.
Which muscle causes the eye to move outward laterally?
the lateral rectus
Contraction of the lateral rectus pulls the eye away from the nose (abduction or lateral movement).
What is inferior oblique?
The inferior oblique is the only extraocular muscle to have its anatomic origin in the anterior orbit. The muscle runs from the medial corner of the orbit to the lateral aspect of the globe, its length approximately paralleling the tendon of insertion of the superior oblique muscle.
What does superior oblique eye muscle do?
These muscles are unique in that they do not originate from the common tendinous ring, have an angular attachment to the eyeball, and they attach to the posterior aspect of the eyeball. The superior oblique functions explicitly to move the eye in the down-and-out position and intort the eye.
What eye movement is caused by the inferior rectus?
The inferior rectus has a primary action of depressing the eye, causing the cornea and pupil to move inferiorly. The inferior rectus originates from the Annulus of Zinn and courses anteriorly and laterally along the orbital floor, making an angle of 23 degrees with the visual axis.
What is the function of the inferior rectus muscle?
What supplies the inferior oblique muscle?
The inferior oblique is innervated by the inferior division of the oculomotor nerve, which enters the muscle on its upper surface. Table 10-3 lists the motor innervation of the extraocular muscles.
What are the oblique muscles of the eye?
The extraocular muscles are a group of six extrinsic muscles of the eye. These are the superior rectus, lateral rectus, inferior rectus, medial rectus, superior oblique and inferior oblique muscles.
What is inferior Eye Movement?
Inferior Rectus (IR) Moves the eye downwards (depression) Rotates the top of the eye away from the nose (extorsion) Moves the eye inward (adduction)
What is the inferior oblique innervated by?
the oculomotor nerve
The inferior oblique is innervated by the inferior division of the oculomotor nerve, which enters the muscle on its upper surface.