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The medial rectus muscle is a muscle in the orbit. As with most of the muscles of the orbit, it is innervated by the inferior division of the oculomotor nerve (Cranial Nerve III). This muscle shares an origin with several other extrinsic eye muscles, the anulus tendineus, or common tendon. It is the largest of the extraocular muscles and its only action is adduction of the eyeball. Its function is to bring the pupil closer to the midline of the body. It is tested clinically by asking the patient to look medially. ==Additional images== File:Gray869.png|Horizontal section of the eyeball. File:Gray890.png|Dissection showing origins of right ocular muscles, and nerves entering by the superior orbital fissure. File:ThreeNeuronArc.png |Vestibulo-ocular reflex File:Slide7uu.JPG|Medial rectus muscle File:Slide14uu.JPG|Medial rectus muscle File:Slide3aba.JPG|Extrinsic eye muscle. Nerves of orbita. Deep dissection. File:Slide1abaa.JPG|Extrinsic eye muscle. Nerves of orbita. Deep dissection. File:Slide2abaa.JPG|Extrinsic eye muscle. Nerves of orbita. Deep dissection. File:Slide3abab.JPG|Extrinsic eye muscle. Nerves of orbita. Deep dissection. File:Slide4abab.JPG|Extrinsic eye muscle. Nerves of orbita. Deep dissection. File:Slide5abab.JPG|Extrinsic eye muscle. Nerves of orbita. Deep dissection. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Medial rectus muscle」の詳細全文を読む スポンサード リンク
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