Inferior rectus
Inferior Rectus
The Inferior Rectus (pronounced: in-FEER-ee-or REK-tus) is one of the seven extraocular muscles that control the movements of the eye. The term "Inferior Rectus" is derived from Latin, with 'Inferior' meaning 'lower' and 'Rectus' meaning 'straight'.
Function
The primary function of the Inferior Rectus is to depress the eye, or move it downward. It also contributes to inward (medial) and outward (lateral) movements of the eye.
Structure
The Inferior Rectus 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).
Clinical Significance
Damage to the Inferior Rectus or its nerve supply can result in Diplopia (double vision) and difficulty in moving the eye downward. This condition is often diagnosed and treated by Ophthalmologists and Neurologists.
Related Terms
- Extraocular Muscles: The group of muscles to which the Inferior Rectus belongs.
- Annulus of Zinn: The common origin of the four rectus muscles of the eye.
- Inferior Division of Oculomotor Nerve: The nerve that supplies the Inferior Rectus.
- Diplopia: A condition of double vision, which can result from damage to the Inferior Rectus.
See Also
External links
- Medical encyclopedia article on Inferior rectus
- Wikipedia's article - Inferior rectus
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