Inferior rectus muscle
Inferior Rectus Muscle
The Inferior Rectus Muscle (pronounced: in-FEER-ee-or REK-tus MUS-kul) is one of the seven extraocular muscles that control the movements of the eye.
Etymology
The term "Inferior Rectus" is derived from Latin, where "Inferior" means lower and "Rectus" refers to straight. Thus, the term literally translates to the "straight muscle that is lower", indicating its position and function in the eye.
Function
The primary function of the Inferior Rectus Muscle is to depress the eye, or move it downward. It also contributes to adduction (movement of the eye towards the nose) and internal rotation of the eye.
Anatomy
The Inferior Rectus Muscle originates from the Annulus of Zinn, a tendinous ring in the orbit, and inserts into the anterior, inferior surface of the eye. It is innervated by the Inferior Division of Oculomotor Nerve (Cranial Nerve III).
Related Terms
- Extraocular Muscles: The group of muscles to which the Inferior Rectus belongs. These muscles control the movements of the eye.
- Annulus of Zinn: The common origin of the four rectus muscles of the eye, including the Inferior Rectus.
- Inferior Division of Oculomotor Nerve: The nerve that supplies the Inferior Rectus Muscle.
- Adduction: Movement of the eye towards the nose, a function assisted by the Inferior Rectus Muscle.
- Depression (eye): Downward movement of the eye, the primary function of the Inferior Rectus Muscle.
External links
- Medical encyclopedia article on Inferior rectus muscle
- Wikipedia's article - Inferior rectus muscle
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