What is the rectus muscle in the eye?
EXTRAOCULAR MUSCLES: 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 are the 3 rectus eye muscles?
Three antagonistic pairs of muscles control eye movements: the lateral and medial rectus muscles, the superior and inferior rectus muscles, and the superior and inferior oblique muscles.
What are the four rectus muscles of the eye?
These muscles are the four rectus muscles—the inferior, medial, lateral, and superior recti—and the superior and inferior oblique muscles.
What does the lateral rectus muscle of the eye 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 Innervates medial rectus?
The medial rectus is innervated by the lower division of cranial nerve III (oculomotor). The lateral rectus is innervated by cranial nerve VI (abducens nerve), and the superior oblique is innervated by cranial nerve IV (trochlear).
Where is the rectus muscle located?
abdomen
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.
How many muscles are in the rectus?
Is the lateral rectus muscle intrinsic or extrinsic?
In mammals, there are six muscles that are responsible for voluntary and reflexive eye movement (Buttner-Ennever, 1988). As a group, these muscles are called extrinsic eye muscles. The six muscles in this group are: medial rectus, lateral rectus, superior rectus, superior oblique, inferior rectus and inferior oblique.
What type of muscle is the medial rectus?
extraocular muscles
Medial rectus muscle (Musculus rectus medialis) Medial rectus is one of the six extraocular muscles located in the orbit. Attaching between the bony walls of the orbit and the eyeball, these muscles serve to synchronously move the eyes….Medial rectus muscle.
| Origin | Common tendinous ring (annulus of Zin) |
|---|---|
| Blood supply | Ophthalmic artery |
What is medical rectus?
Reviewed on 3/29/2021. Rectus: Usually refers to the rectus abdominis, a large muscle in the front of the abdomen that assists in the regular breathing movement and supports the muscles of the spine while lifting and keeping abdominal organs such as the intestines in place.
What is rectus anatomy?
Definition of rectus : any of several straight muscles (as of the abdomen)
What does the superior rectus muscle in the eye do?
The superior rectus is an eye muscle, controlling the eye as it moves up. This muscle is among four muscles – including the medial rectus, lateral rectus, and the inferior rectus – which control the eye’s movement.
What muscle turns the eye superiorly and medially?
Right inferior oblique turns the eye supero-laterally Left superior rectus turns the eye superiorly and medially Other muscles that elevate and turn the eye laterally or medially are involved too
What are the muscles of the eye and their functions?
There are six muscles responsible for the different movements of both eyes. They are the lateral, medial, inferior, and superior rectus, and the inferior and superior oblique muscles. Each one of these extraocular muscles has specific functions which allow each eye to move in certain directions.
What is eye muscle elevates and turns the eye laterally?
Due to its unique path, the superior oblique , when activated, pulls the eye downward and laterally. The last muscle is the inferior oblique, which originates at the lower front of the nasal orbital wall, and passes under the LR to insert on the lateral, posterior part of the globe. Thus, the inferior oblique pulls the eye upward and laterally.