What does lateral rectus muscle do?
What does lateral rectus muscle do?
Structure and Function The lateral rectus is a flat-shaped muscle, and it is wider in its anterior part. 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.
What do rectus muscles do?
The rectus muscles move the eyes about the longitudinal axis of the body, that is, superiorly (upward) or inferiorly (downward), or about a vertical axis, in other words, laterally (backward) or medially (forward), according to their position relative to the eyeball.
What is the right lateral rectus muscle?
The lateral rectus muscle is a muscle on the lateral side of the eye in the orbit. It is one of six extraocular muscles that control the movements of the eye. The lateral rectus muscle is responsible for lateral movement of the eyeball, specifically abduction.
What happens when the lateral rectus muscle contracts?
Contraction of the lateral rectus pulls the eye away from the nose (abduction or lateral movement).
What is the origin of lateral rectus?
The lateral rectus muscle arises from the common tendinous ring and runs anteriorly across the lateral part of the orbit to insert at the lateral side of the eyeball….Lateral rectus muscle.
| Origin | Common tendinous ring (Annulus of Zinn) |
|---|---|
| Action | Abducts eyeball |
| Innervation | Abducens nerve (CN VI) |
| Blood supply | Ophthalmic artery |
What are the actions of the lateral rectus?
Like other straight muscles, the lateral rectus is named by its position within the orbit relative to the eyeball. The primary action of the lateral rectus muscle is abduction of the eyeball. It works in synergy or opposition with other extrinsic muscles of the eye to produce coordinated movements and direct the gaze.
What are marriage muscles?
7-Muscle of marriage – medial rectus.
What does longus mean in anatomy?
a Latin word meaning “long,” used in the medical names and descriptions of some muscles.
What is abs muscle?
The rectus abdominis muscle, also known as the “abdominal muscle” or simply the “abs”, is a paired muscle running vertically on each side of the anterior wall of the human abdomen, as well as that of some other mammals.
What is the anatomy of the lateral rectus?
Anatomical terms of muscle. The lateral rectus muscle is a muscle on the lateral side of the eyeball in the orbit. It is one of six extraocular muscles that control the movements of the eye. The lateral rectus muscle is responsible for lateral movement of the eyeball, specifically abduction.
What muscle innervates the lateral rectus?
Lateral rectus muscle. The lateral rectus muscle is a muscle in the orbit. It is one of six extraocular muscles that control the movements of the eye and the only muscle innervated by the abducens nerve, cranial nerve VI.
Where does the lateral rectus muscle move the pupil?
In the orbit of the eye, also called the eye socket, the lateral rectus muscle helps move the pupil away from the body’s midline. The muscle inserts into the temporal (outer) side of the eyeball and stretches to the annulus of Zinn, a tendinous ring circling the optic nerve.
What happens if the lateral rectus muscle is paralyzed?
The lateral rectus muscle will be denervated and paralyzed and the patient will be unable to abduct the eye. For example, if the left abducens nerve is damaged, the left eye will not abduct fully.