Eye Muscle Anatomy

The medical information on this site is provided as an information resource only and is. Muscles of Eye Movement.

The Eye And Vision Rectus Muscle Anatomy And Physiology Autonomic Nervous System

The antagonist of the superior rectus muscle is the inferior rectus muscle which depresses the eye allowing the eye to look down.

Eye muscle anatomy. Extrinsic muscles of the eye dorsolateral aspect. 379 arises from the nasal part of the frontal bone from the frontal process of the maxilla in front of the lacrimal groove and from the anterior surface and borders of a short fibrous band the medial palpebral ligament. The extraocular muscles are placed in the orbit but are extrinsic and separate from the eyeball itself.

Learn about their function and problems that can affect the eyes. Optic nerve CN II Muscles. Anatomy of the Eye.

They can be divided into two groups. Evans HE Lahunta A. They work to control the movements of the eyeball including the superior eyelid.

The Levator palpebræ superioris is described with the Anatomy of the Eye. They work against each other to control the movements of the eye in various directions. The other four muscles move the eye up down and at an angle.

The Orbicularis oculi Orbicularis palpebrarum Fig. This muscle inserts on the posterior superior medial surface of the eye. Muscles responsible for moving the eyeball are attached to the eyeball at the sclera.

Abnormality of one or more of these muscles or the nerves that supply them may result in a. Innervation of the eye. The four recti muscles and the two oblique muscles.

Responsible for superior eyelid movement Recti and oblique muscles. Six of these are responsible for eye movement and are also known as oculorotatory muscles. The iris has a ring of muscle fibers around the pupil which when they contract causes the pupil to constrict become smaller.

When these muscles contract the pupil dilates becomes larger. The eyeball and its functional muscles are surrounded by a layer of orbital fat that acts much like a cushion permitting a smooth rotation of the eyeball about a virtually fixed point the centre of rotation. This occurs under reduced illumination or in darkness.

The surface of the eye and the inner surface of the eyelids are covered with a clear membrane called the conjunctiva. The second set of muscle fibers radiate outward from the pupil. In the neutral position the medial rectus muscle is responsible for adduction.

Eye muscles which control eye movement are seen in the image above. The four rectus muscles of the eye control the movement of the eye in the cardinal directions. The origin is the Annulus of Zinn.

It elevates the superior eyelid and is innervated by the oculomotor nerve CN III. On the medial side of the eye the medial rectus muscle adducts the eye. Superior rectus inferior rectus medial rectus and lateral rectus.

The sclera is outermost layer of the eyeball. These muscles are also known as the extrinsic eye muscles distinguishing them from intrinsic eye muscles which are responsible for controlling the movement of the iris. There are seven extraocular muscles.

This occurs in bright light. It is the white and opaque part of the eyeball. There are six muscles involved in the control of the eyeball itself.

Extrinsic ocular muscles and their action on the left eyeball. Each of the eyes recti muscles originates from the common tendinous ring sometimes referred to as the annular tendon or annulus of Zinn This is a fibrous ring of connective tissue that surrounds the optic nerve where it connects to the orbit. Oculomotor CN III trochlear CN IV and abducens CN VI nerves.

There are four recti muscles. The final extraocular muscle is levator palpebrae superioris which originates from the lesser wing of the sphenoid bone and inserts onto the superior tarsal plate of the superior eyelid. The eye has four recti muscles all of which attach to the front half of the eye anterior to the equator of the eye.

The protrusion of the eyeballsproptosisin exophthalmic goitre is caused by the collection of fluid in the orbital fatty tissue. The extraocular muscles are the six muscles that control movement of the eye and one muscle that controls eyelid elevation levator palpebraeThe actions of the six muscles responsible for eye movement depend on the position of the eye at the time of muscle contraction. 2012 Millers anatomy of the dog 4th edn Missouri.

Sphincter pupillae dilator pupillae ciliaris. WebMDs Eyes Anatomy Pages provide a detailed picture and definition of the human eyes. START NOW FOR FREE.

There are seven extraocular muscles-Levator palpebrae superioris. Muscles of the eye. There are six eye muscles that control eye movement.

The seventh lifts the upper eyelid section 53. The muscles cause rotation of the globe of the eye around a central point. The first of these muscles the superior rectus muscle elevates the eye allowing the eye to look up.

The extraocular muscles EOM are responsible for controlling the movements of the eyeball and upper eyelid. These muscles characteristically originate from the common tendinous ring. Tears lubricate the eye and are made up of three layers.

Superior rectus inferior rectus medial rectus lateral rectus superior oblique inferior oblique levator palpebrae superioris Intrinsic. Embryology of Extraocular Muscles The fibers of the striated EOMs originate from condensations of cranial mesoderm whereas their associated connective tissues and the orbital smooth muscles SMs originate from the neural crest. One muscle moves the eye to the right and one muscle moves the eye to the left.

Responsible for eye movement. The 2 other extraocular muscles controlling eye movement are. The layers of the tear film keep the front of the eye lubricated.

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