| musculus longissimus | <anatomy> The intermediate division of the erector spinae muscle having three subdivisions: longissimus capitis muscle, longissimus cervicis muscle, and longissimus thoracis muscle. Synonym: musculus longissimus. (05 Mar 2000) |
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| musculus longissimus cervicis | <anatomy, muscle> Origin, transverse processes of upper thoracic vertebrae; insertion, transverse processes of middle and upper cervical vertebrae; action, extends cervical vertebrae; nerve supply, dorsal primary rami of lower cervical and upper thoracic spinal nerves. Synonym: musculus longissimus cervicis, cervical longissimus muscle, musculus transversalis cervicis, musculus transversalis colli. (05 Mar 2000) |
| musculus longissimus dorsi | <anatomy, muscle> Origin, with iliocostalis and from transverse processes of lower thoracic vertebrae; insertion, by lateral slips into most or all of the ribs between angles and tubercles and into tips of transverse processes of upper lumbar vertebrae, and by medial slips into accessory processes of upper lumbar and transverse processes of thoracic vertebrae; action, extends vertebral column; nerve supply, dorsal primary rami of thoracic and lumbar spinal nerves. Synonym: musculus longissimus thoracis, musculus longissimus dorsi, thoracic longissimus muscle. (05 Mar 2000) |
| musculus longissimus thoracis | <anatomy, muscle> Origin, with iliocostalis and from transverse processes of lower thoracic vertebrae; insertion, by lateral slips into most or all of the ribs between angles and tubercles and into tips of transverse processes of upper lumbar vertebrae, and by medial slips into accessory processes of upper lumbar and transverse processes of thoracic vertebrae; action, extends vertebral column; nerve supply, dorsal primary rami of thoracic and lumbar spinal nerves. Synonym: musculus longissimus thoracis, musculus longissimus dorsi, thoracic longissimus muscle. (05 Mar 2000) |
| musculus longitudinalis inferior | An intrinsic muscle of the tongue, cylindrical in shape, occupying the underpart on either side; action, shortens the lower part of the tongue; nerve supply, motor by hypoglossal, sensory by lingual. Synonym: musculus longitudinalis inferior, inferior lingual muscle. (05 Mar 2000) |
| musculus longitudinalis superior | An intrinsic muscle of the tongue, running from base to tip on the dorsum just beneath the mucous membrane; action, shortens the upper part of the tongue; nerve supply, motor by hypoglossal, sensory by lingual. Synonym: musculus longitudinalis superior, superficial lingual muscle. (05 Mar 2000) |
| musculus lumbricalis manus | Four intrinsic muscles of the hand; origin, the two lateral: from the radial side of the tendons of the flexor digitorum profundus going to the index and middle fingers; the two medial: from the adjacent sides of the second and third, and third and fourth tendons; insertion, radial side of extensor tendon on dorsum of each of the four fingers; action, flexes metacarpophalangeal joint and extends the proximal and distal interphalangeal joint; nerve supply, the two radial muscles by the median, the two ulnar muscles by the ulnar. Synonym: musculus lumbricalis manus. (05 Mar 2000) |
| musculus lumbricalis pedis | Four intrinsic muscles of the foot; origin, first: from tibial side of tendon to second toe of flexor digitorum longus; second, third, and fourth: from adjacent sides of all four tendons of this musculus; insertion, tibial side of extensor tendon on dorsum of each of the four lateral toes; action, flex the proximal and extend the middle and distal phalanges; nerve supply, lateral (second to fourth lumbricals) and medial (first lumbrical) plantar. Synonym: musculus lumbricalis pedis. (05 Mar 2000) |
| musculus masseter | <anatomy> A masticatory muscle whose action is closing the jaws. (12 Dec 1998) |
| musculus mentalis | <anatomy, muscle> Origin, incisor fossa of mandible; insertion, skin of chin; action, raises and wrinkles skin of chin, thus elevating the lower lip; nerve supply, facial. Synonym: musculus mentalis, chin muscle, musculus levator labii inferioris. (05 Mar 2000) |
| musculus multifidus | <anatomy, muscle> Origin, from the sacrum, sacroiliac ligament, mamillary processes of the lumbar vertebrae, transverse processes of thoracic vertebrae, and articular processes of last four cervical vertebrae; insertion, into the spinous processes of all the vertebrae up to and including the axis; action, rotates vertebral column; nerve supply, dorsal primary rami of spinal nerves. Synonym: musculus multifidus, intermediate layer of the transversospinalis muscles, musculus multifidus spinae. (05 Mar 2000) |
| musculus multifidus spinae | <anatomy, muscle> Origin, from the sacrum, sacroiliac ligament, mamillary processes of the lumbar vertebrae, transverse processes of thoracic vertebrae, and articular processes of last four cervical vertebrae; insertion, into the spinous processes of all the vertebrae up to and including the axis; action, rotates vertebral column; nerve supply, dorsal primary rami of spinal nerves. Synonym: musculus multifidus, intermediate layer of the transversospinalis muscles, musculus multifidus spinae. (05 Mar 2000) |
| musculus multipennatus | <anatomy> A muscle with several central tendons toward which the muscle fibres converge like the barbs of feathers. Synonym: musculus multipennatus. (05 Mar 2000) |
| musculus mylohyoideus | <anatomy> Pertaining to, or in the region of, the lower jaw and the hyoid apparatus; as, the mylohyoid nerve. <anatomy, muscle> Origin, mylohyoid line of mandible; insertion, upper border of hyoid bone and raphe separating muscle from its fellow; action, elevates floor of mouth and the tongue, depresses jaw when hyoid is fixed; nerve supply, nerve to mylohyoid from mandibular division of trigeminal. Synonym: musculus mylohyoideus, mylohyoideus. Origin: Gr. The molar teeth + E. Hyoid. (05 Mar 2000) |
| musculus mylopharyngeus | See: superior constrictor muscle of pharynx. (05 Mar 2000) |