| musculi interossei | Muscles which arise from and run between the long (metacarpal and metatarsal) bones of the hand and foot, extending to and producing movement of the digits. See: dorsal interosseous muscles of foot, dorsal interosseous muscles of hand, palmar interosseous muscle, plantar interosseous muscle. Synonym: musculi interossei. (05 Mar 2000) |
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| musculi interossei dorsalis manus | Four muscles in the hand; origin, sides of adjacent metacarpal bones; insertion, proximal phalanges and extensor expansion, first on radial side of index, second on radial side of middle finger, third on ulnar side of middle finger, fourth on ulnar side of ring finger; action, abduct fingers 2-4 from the axis of the middle finger, nerve supply, ulnar. Synonym: musculi interossei dorsalis manus. (05 Mar 2000) |
| musculi interossei dorsalis pedis | Four muscles in the foot; origin, from sides of adjacent metatarsal bones; insertion, first into medial, second into lateral side of proximal phalanx of second toe, third and fourth into lateral side of proximal phalanx of third and fourth toes; action, abduct toes 2-4 from an axis through the second toe; nerve supply, lateral plantar. Synonym: musculi interossei dorsalis pedis. (05 Mar 2000) |
| musculi interspinales | The paired muscles between spinous processes of adjacent vertebrae; subdivided into cervical, thoracic, and lumbar muscles. Synonym: musculi interspinales, interspinal muscles. (05 Mar 2000) |
| musculi intertransversarii | The paired muscles between transverse processes of adjacent vertebrae; there are anterior and posterior muscles in the cervical region; lateral and medial muscles in the lumbar region; and single muscles in the thoracic region. Synonym: musculi intertransversarii, intertransverse muscles. (05 Mar 2000) |
| musculi intertransversarii anteriores cervicis | Origin, anterior tubercle of cervical transverse process; insertion, anterior tubercle of next superior transverse process; action, abducts cervical vertebrae; nerve supply, ventral branch of cervical nerves. Synonym: musculi intertransversarii anteriores cervicis, anterior cervical intertransverse muscles. (05 Mar 2000) |
| musculi intertransversarii laterales lumborum | Origin, transverse processes of lumbar vertebrae; insertion, next superior transverse process; action, abducts lumbar vertebrae; nerve supply, ventral branches of lumbar nerves. Synonym: musculi intertransversarii laterales lumborum, lateral lumbar intertransverse muscles. (05 Mar 2000) |
| musculi intertransversarii mediales lumborum | Origin, accessory and mamillary processes of lumbar vertebrae; insertion, corresponding processes of next superior vertebra; action, abducts lumbar vertebrae; nerve supply, dorsal primary rami of lumbar spinal nerves. Synonym: musculi intertransversarii mediales lumborum, medial lumbar intertransverse muscles. (05 Mar 2000) |
| musculi intertransversarii posteriores cervicis | Origin, lateral part: posterior tubercle of cervical transverse process; medial part: transverse process; insertion, corresponding parts of next superior transverse process; action, abducts cervical vertebrae; nerve supply, lateral part: ventral primary rami of cervical spinal nerves; medial part: dorsal primary rami of cervical spinal nerves. Synonym: musculi intertransversarii posteriores cervicis, posterior cervical intertransverse muscles. (05 Mar 2000) |
| musculi intertransversarii thoracis | Origin, transverse processes of thoracic vertebrae; insertion, next superior transverse process; action, abducts thoracic vertebrae; nerve supply, dorsal primary rami of thoracic nerves. Synonym: musculi intertransversarii thoracis, thoracic intertransverse muscles. (05 Mar 2000) |
| musculi laryngis | The intrinsic muscles that regulate the length, position and tension of the vocal cords and adjust the size of the openings between the aryepiglottic folds, the ventricular folds and the vocal folds. Synonym: musculi laryngis. (05 Mar 2000) |
| musculi levatores costarum | musculus levator costae, elevator muscle of rib, musculi levatores costarum |
| musculi levatores costarum breves | Origin, the transverse processes of last cervical and eleven thoracic vertebrae; insertion ribs immediately below, between angle and tubercle. Synonym: musculi levatores costarum breves. (05 Mar 2000) |
| musculi levatores costarum longi | Insertion, the second rib below their origin; action, raise ribs; nerve supply, intercostal. Synonym: musculi levatores costarum longi. (05 Mar 2000) |
| musculi linguae | The extrinsic muscles include the genioglossus, hyoglossus, chondroglossus, and styloglossus muscles; the intrinsic muscles are the vertical, transverse, and the superior and inferior longitudinal; all are innervated by the hypoglssal nerve. Synonym: musculi linguae. (05 Mar 2000) |