Extraocular muscles | The survival encyclopedia


Extraocular muscles

For external striated muscle Eyeball include four rectus muscles: upper, lower, medial and lateral (mm. recti superior, inferior, medialis et lateralis), and two forward, upper and lower (mm. obliqui superior et inferior) (Fig. 551).

551. Outdoor extraocular muscles (By Kiss, Szentagothai).
1 — m. rectus superior; 2 — m. rectus lateralis; 3 — m. rectus medialis; 4 — m. levator palpebrae superioris; 5 — m. obliquus superior.

All the muscles of the eyeball, except the inferior oblique, begin at the opening of the visual environment of the channel and the upper orbital fissure, which forms a common tendon ring (anulus tendineus communis). Through this ring are in orbit optic nerve, ophthalmic artery, the oculomotor nerve, and abducens nosoresnichny.
The four rectus muscles tendons are woven into the tunica albuginea in front of the equator of the eyeball. With the reduction of the upper and lower muscles of the pupil moves in the sagittal plane up and down, while reducing the lateral and medial rectus muscles — in the frontal plane. Superior oblique muscle adjacent to the part of the eye sockets verhnemedialnoy, her thin tendon spreads through connective unit attached to the hollow block or bony prominences. Then the tendon goes back down and laterally by attaching to tunica albuginea Eyeball on verhnelateralnoy part behind the equator. While reducing the superior oblique eye axis moves downward and laterally. The lower oblique muscle starts from the lateral circumference of the lacrimal sac fossa and goes under the eye apple, attaching the lateral aspect behind the equator. With the reduction of the inferior oblique muscle pupil is given up and laterally. Combined operation of all external muscles of the eyeball to ensure rotation of the circle.

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