| MCC | mean corpuscular hemoglobin concentration; medial cell column; Medical Council of Canada; metacerebr... |
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| MCT | manual cervical traction; mean cell thickness; mean cell threshold; mean circulation time; mean corp... |
| ME-BH | medial eminence of basal hypothalamus |
| med | medial; median; medication; medicine, medical; medium |
| MFB | medial forebrain bundle; metallic foreign body |
| medial inguinal fossa | A depression on the peritoneal surface of the anterior abdominal wall between the ridges formed by the inferior epigastric artery and the medial umbilical ligament; it corresponds to the position of the superficial inguinal ring and is the site of a direct inguinal hernia. Synonym: fossa inguinalis medialis, fovea inguinalis interna. (05 Mar 2000) |
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| medial lacunar lymph node | A lymph node of the external iliac group located medial to the external iliac vein at the vascular lacuna. Synonym: nodus lacunaris medialis, medial lacunar node. (05 Mar 2000) |
| medial lacunar node | A lymph node of the external iliac group located medial to the external iliac vein at the vascular lacuna. Synonym: nodus lacunaris medialis, medial lacunar node. (05 Mar 2000) |
| medial lamina of cartilaginous auditory tube | The broad medial portion of the cartilaginous part of the auditory tube. Synonym: lamina medialis cartilaginis tubae auditivae, lamina cartilaginis medialis tubae auditivae, medial cartilaginous layer, medial layer of cartilaginous auditory tube. (05 Mar 2000) |
| medial layer of cartilaginous auditory tube | The broad medial portion of the cartilaginous part of the auditory tube. Synonym: lamina medialis cartilaginis tubae auditivae, lamina cartilaginis medialis tubae auditivae, medial cartilaginous layer, medial layer of cartilaginous auditory tube. (05 Mar 2000) |
| medial lemniscus | A band of white fibres originating from the gracile and cuneate nuclei and decussating in the lower medulla; thence it passes upward through the centre of the medulla oblongata, close to the median raphe; on entering the pons it spreads out laterally to form a flat band ascending over the dorsal border of the pontine nuclei; in the mesencephalon it passes over the dorsal border of the substantia nigra and is displaced laterally by the red nucleus; passing medial to the medial geniculate body, the bundle enters and terminates in the ventral posterior nucleus of the thalamus. Throughout their course, the fibres retain a somatotopic order such that those originating from the gracile nucleus and representing the lower extremity lie lateral to those originating in the cuneate nucleus and representing the arm. The medial lemniscus conveys somatic-sensory information involved in tactile discrimination (two-point discrimination), position sense, and vibration sense. Synonym: lemniscus medialis, medial fillet, Reil's band, Reil's ribbon. (05 Mar 2000) |
| medial limb | Limb or leg-like portion of a structure closest to the midline. Synonym: crus mediale, medial limb. (05 Mar 2000) |
| medial lip of linea aspera | The medial margin of the linea aspera of the femur that provides attachment for part of the vastus medialis muscle. Synonym: labium mediale lineae asperae. (05 Mar 2000) |
| medial longitudinal arch of foot | Formed by the calcaneus, talus, navicular, three cuneiform bones, and the three medial metatarsals. Synonym: arcus pedis longitudinalis pars medialis. (05 Mar 2000) |
| medial longitudinal bundle | A longitudinal bundle of fibres extending from the upper border of the mesencephalon into the cervical segments of the spinal cord, located close to the midline and ventral to the central gray matter; it is composed largely of fibres from the vestibular nuclei ascending to the motor neurons innervating the external eye muscles (abducens, trochlear, and oculomotor nuclei), and descending to spinal cord segments innervating the musculature of the neck. Synonym: fasciculus longitudinalis medialis, Collier's tract, medial longitudinal bundle, posterior longitudinal bundle. (05 Mar 2000) |
| medial longitudinal fasciculus | A longitudinal bundle of fibres extending from the upper border of the mesencephalon into the cervical segments of the spinal cord, located close to the midline and ventral to the central gray matter; it is composed largely of fibres from the vestibular nuclei ascending to the motor neurons innervating the external eye muscles (abducens, trochlear, and oculomotor nuclei), and descending to spinal cord segments innervating the musculature of the neck. Synonym: fasciculus longitudinalis medialis, Collier's tract, medial longitudinal bundle, posterior longitudinal bundle. (05 Mar 2000) |
| medial longitudinal stria | A thin longitudinal band of nerve fibres accompanied by gray matter, running along the surface of the corpus callosum on either side of the median line. Together with the lateral longitudinal stria it forms part of a thin layer of gray matter on the dorsal surface of the corpus callosum, the indusium griseum, a rudimentary component of the hippocampus. Synonym: stria longitudinalis medialis. (05 Mar 2000) |
| medial lumbar intertransversarii muscles | 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) |
| medial lumbar intertransverse muscles | 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) |
| medial lumbocostal arch | <anatomy> One of Haller's arches; a tendinous thickening of the psoas fascia that extends from the body of the first lumbar vertebra to its transverse process on either side. A portion of the diaphragm arises from it. Synonym: ligamentum arcuatum mediale, arcus lumbocostalis medialis, medial lumbocostal arch. (05 Mar 2000) |