Anatomy Of The Eye Muscles

Facial Nerve CN VII. The first of these muscles the superior rectus muscle elevates the eye allowing the eye to look up.

Eye Muscles Rectus Muscle Medical Facts Medical Mnemonics

Four muscles that run almost a straight course from origin to insertion and hence are called recti Latin for straight and two muscles that run a diagonal course the oblique muscles.

Anatomy of the eye muscles. The muscles responsible for the movement of the eye may be divided into the four recti muscles and the two oblique muscles. Functionally they can be divided into two groups. Responsible for eye movement.

The four rectus muscles of the eye control the movement of the eye in the cardinal directions. My DashboardMy EducationFind an Ophthalmologist. 2012 Millers anatomy of the dog 4th edn Missouri.

And one other levator palpebrae superioris opens the eyelid. In total there are seven extraocular muscles. The four rectus muscles attach directly to the front half of the eye anterior to the eyes equator and are named after their straight paths.

The eye works much the same as a camera. Extrinsic ocular muscles and their action on the left eyeball. Embryology of Extraocular Muscles The fibers of the striated EOMs originate from condensations of cranial mesoderm whereas their associated connective.

Note that medial and lateral are relative terms. Eye Muscles Anatomy 1. The cornea and the lens help to focus the light rays onto the back of the eye retina.

Intrinsic ocular muscles which are within the eyeball itself and control how the eyes accommodate. Iris - The iris is a pigmented tissue with two muscles that control pupil constriction and pupil dilation. The four rectus muscles.

They work against each other to control the movements of the eye in various directions. On the medial side of the eye the medial rectus muscle adducts the eye. Superior rectus inferior rectus medial rectus lateral rectus superior oblique and inferior oblique muscles.

The 4 extraocular muscles that control eye movement in the cardinal directions along with their functions are the superior rectus inferior rectus lateral rectus and medial rectus muscles. Extrinsic muscles of the eye dorsolateral aspect. In addition to the eyeball itself the orbit contains the muscles that move the eye blood vessels and nerves.

Tonsils Waldeyers Ring Thorax. This nerve only innervates one muscle of the eye the lateral rectus muscle. A small portion of this muscle contains smooth muscle fibers known as the superior tarsal muscle.

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. Extraocular muscles and orbit in a cadaver. Central Artery and Vein.

Six extraocular muscles move the eye. The iris acts like a diaphragm that controls the amount of light allowed into the eye. Four of the extraocular muscles have their origin in the back of the orbit in a fibrous ring called the annulus of Zinn.

The sclera is continuous with the cornea. The main muscles of the eye are Lateral rectus Medial rectus Superior rectus and inferior rectus. Recti and oblique muscles.

Sclera - The sclera is the white tough outer covering of globe of the eye. In the eyes this nerve is responsible for eye closure and blinking by having motor innervation of the orbicularis oculi muscle. Muscles of the eye are very strong and efficient they work together to move the eyeball in many different directions.

The antagonist of the superior rectus muscle is the inferior rectus muscle which depresses the eye allowing the eye to look down. Six of these are responsible for the movement of the eye with the seventh being responsible for the movement of the superior eyelid. The cells in the retina absorb and convert the light to electrochemical impulses which are transferred along the optic nerve and then to the brain.

The central artery and vein runs through the center of the optic nerve. There are six eye muscles that control eye movement. It has multiple functions including involuntary blinking voluntarily and forcibly closing the eyelids and tear drainage.

The eye is cushioned within the orbit by pads of fat. The Levator palpebræ superioris is described with the Anatomy of the Eye. The other four muscles move the eye up down and at an angle.

They are summarised in the table below. One muscle moves the eye to the right and one muscle moves the eye to the left. The Orbicularis oculi Orbicularis palpebrarum Fig.

Light passes through the front of the eye cornea to the lens. Responsible for eye movement - Recti and oblique muscles. The nerves that innervate the eye Abducens Nerve CN VI.

It is innervated by the facial nerve CN VII. Evans HE Lahunta A. The orbit is formed by the cheekbone the forehead the temple and the side of the nose.

The orbicularis muscle consists of the concentric bands of muscle surrounding the eyelid. The levator palpebrae superioris is the only muscle which is involved in raising the superior eyelid. There are seven extraocular muscles - the levator palpebrae superioris superior rectus inferior rectus medial rectus lateral rectus inferior oblique and superior oblique.

Muscles responsible for the movement of the eye This group contains six muscles. The orbit is the bony eye socket of the skull.

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