Muscles of the eyes

Lateral, medial, superior inferior Rectus, superior and inferior Oblique

The are six muscles of the eyes responsible for movement of the eye. These muscles function in Agonist and Antagonist pairs enabling us to move our eyeballs in the cardinal directions, up, down, left and right

There are six muscles which are responsible for controlling the movement of the eyeballs. These muscles are called extrinsic eye muscles because their origin points are outside of the eyeballs (in the orbit) and insertion points are on the outer surface of the Sclera.  These extrinsic eye muscles are some of the fastest contracting and most precisely controlled skeletal muscles in the human body and function as Agonist & Antagonists pairs to move the eyeball.

  1. Superior and Inferior Rectus Muscles,
  2. Lateral and Medial Rectus Muscles,
  3. Superior and Inferior Oblique Muscle.

The Rectus muscles are primarily responsible for the movement of the eyeballs in the four cardinal directions: up, down, left and right. The pair of Oblique muscles are responsible for controlling the adjustments involved in counteracting head movements, in other words being able to keep your focus on something whilst your head moves.

lateral rectus, medial rectus, surperficial rectus, inferior rectus, superior oblique, inferior oblique

The Extrinsic muscles of the eyes are some of the some of the fastest contracting and most precisely controlled skeletal muscles in the human body

Superior Rectus Muscle

The Superior Rectus muscle is the agonist of the Inferior Rectus muscle and is responsible for three movements of the eye. Primarily it is responsible for moving the eyes in an upwards direction(elevation), secondly it rotates the top of the eye toward the nose (intorsion) and thirdly it moves the eye inward (adduction). The origin point of the Superior Rectus Muscle is from the Annulus of Zinn and it’s insertion point is into the Sclera of the eye.

Inferior Rectus Muscle

The Inferior Rectus muscle is the antagonist of the Superiro Rectus muscle and is responsible for three movements of the eye.Primarily it is responsible for moving the eye in a downward direction (depression), secondly it rotates the top of the eye away from the nose (extorsion) and thirdly it moves the eye inward (adduction). The origin point of the Inferior Rectus muscle is from the Annulus of Zinn  and it’s insertion point is into the Sclera of the eye.

Lateral Rectus

The Lateral Rectus muscle is the agonist of the Medial Rectus muscle and is primarily responsible for moving the eye in an outward direction, away from the nose (abduction).The origin point of the Lateral Rectus muscle is from the Annulus of Zinn  and it’s insertion point is into the Sclera of the eye.

Medial Rectus

The Medial Rectus muscle is the antagonist of the Lateral Rectus muscle and is primarily responsible for moving the eye in an inward direction, toward the nose (adduction).The origin point of the Lateral Rectus muscle is from the Annulus of Zinn  and it’s insertion point is into the Sclera of the eye.

Superior Oblique

The superior Oblique muscles  is the agonist of the Inferior Oblique muscle and is responsible for three movements of the eye. Primarily it is responsible for rotating the top of the eye toward the nose (intorsion), secondly it moves the eye in a downward direction (depression) and thirdly it moves the eye in outward direction(abduction). The origin point of the Superior Oblique muscle is from the posterior of the Annulus of Zinn from where it then passes anteriorly, and ends in a round tendon. The tendon extends through a pulley like loop of fibrocartilaginous tissue called the trochlea ( pulley) in the anterior and medial part of the roof of the orbit and then turns to it’s insertion point is on the posterolateral aspect of the eyeball.

Inferior Oblique

The Inferior Oblique muscles  is the antagonist of the Superior Oblique muscle and is responsible for three movements of the eye. Primarily it is responsible for rotating the top of the eye away from the nose (extorsion), secondly it moves the eye in a upwards direction (elevation) and thirdly it moves the eye in inward direction(abduction). The origin point of the Superior Oblique muscle is from the maxilla at the anteromedial aspect of the floor of the orbit and it’s insertion point is on the posterolateral aspect of the eyeball.

VN:F [1.9.22_1171]
Rating: 3.8/5 (25 votes cast)
Muscles of the eyes, 3.8 out of 5 based on 25 ratings
Share

Leave a Reply