| lateral popliteal nerve | <anatomy, nerve> One of the terminal divisions of the sciatic nerve, diverging from the tibial nerve at the upper end of the popliteal fossa, then coursing with the biceps tendon along the lateral portion of the popliteal space to wind around the neck of the fibula where it divides into the superficial and deep peroneal nerves. The common peroneal nerve, or its deep branch, is the most commonly injured nerve, being located in a lateral subcutaneous position at the fibular neck; a lesion causes a loss of ability to dorsiflex the foot ("foot drop"). Synonym: nervus fibularis communis, nervus peroneus communis, common fibular nerve, lateral popliteal nerve. (05 Mar 2000) |
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| lateral preoptic nucleus | A vaguely defined group of nerve cells in the lateral zone of the preoptic region. Synonym: nucleus preopticus lateralis. (05 Mar 2000) |
| lateral process of calcaneal tuberosity | The lateral projection from the posterior part of the calcaneus. Synonym: processus lateralis tuberis calcanei. (05 Mar 2000) |
| lateral process of malleus | A short projection from the base of the manubrium of the malleus, attached firmly to the drum membrane. Synonym: processus lateralis mallei, processus brevis, short process of malleus, tuberculum mallei. (05 Mar 2000) |
| lateral process of talus | A projection on the lateral side of the talus below the malleolar articular surface. Synonym: processus lateralis tali. (05 Mar 2000) |
| lateral projection | Radiographic projection with the X-ray beam in a coronal plane. (05 Mar 2000) |
| lateral proprius bundle | lateral proprius bundle |
| lateral pterygoid | <anatomy, muscle> Origin, inferior head from lateral lamina of pterygoid process; superior head from infratemporal crest and adjacent greater wing of the sphenoid; insertion, into pterygoid pit of mandible and articular disk; action, brings jaw forward, opens jaw; nerve supply, nerve to lateral pterygoid from mandibular division of trigeminal. Synonym: musculus pterygoideus lateralis, external pterygoid muscle, musculus pterygoideus externus. (05 Mar 2000) |
| lateral pterygoid plate | The larger and more lateral of the two bony plates extending downward from the point of union of the body and greater wing of the sphenoid bone on either side; forms medial wall of intfratemporal fossa and gives origin to pterygoi muscles. Synonym: lamina lateralis processus pterygoidei, lateral plate of pterygoid process. (05 Mar 2000) |
| lateral puboprostatic ligament | See: puboprostatic ligament. Synonym: lateral puboprostatic ligament. (05 Mar 2000) |
| lateral pyramidal fasciculus | Those fibres of the pyramidal tract that cross to the opposite side in the pyramidal decussation and descend in the dorsal half of the lateral funiculus of the spinal cord; they are distributed throughout the length of the spinal cord to interneurons of the zona intermedia of the spinal gray matter. See: pyramidal tract. Synonym: tractus corticospinalis lateralis, tractus pyramidalis lateralis, crossed pyramidal tract, fasciculus corticospinalis lateralis, fasciculus pyramidalis lateralis, lateral corticospinal tract, lateral pyramidal fasciculus. (05 Mar 2000) |
| lateral pyramidal tract | Those fibres of the pyramidal tract that cross to the opposite side in the pyramidal decussation and descend in the dorsal half of the lateral funiculus of the spinal cord; they are distributed throughout the length of the spinal cord to interneurons of the zona intermedia of the spinal gray matter. See: pyramidal tract. Synonym: tractus corticospinalis lateralis, tractus pyramidalis lateralis, crossed pyramidal tract, fasciculus corticospinalis lateralis, fasciculus pyramidalis lateralis, lateral corticospinal tract, lateral pyramidal fasciculus. (05 Mar 2000) |
| lateral ramus radiograph | A radiographic view of the mandibular ramus and condyle. (05 Mar 2000) |
| lateral recess of fourth ventricle | The narrow recess of the ventricle that extends laterally over, and down along the side of, the inferior cerebellar peduncle and the overlying cochlear nuclei; at its tip it opens by way of Luschka's foramen into the interopeduncular cistern of the subarachnoid space. By way of this recess, part of the choroid plexus of the fourth ventricle protrudes into the subarachnoid space. Synonym: recessus lateralis ventriculi quarti. (05 Mar 2000) |
| lateral recumbent position | A position to facilitate a vaginal examination, the patient lying on the side with the under arm behind the back, the thighs flexed, the upper one more than the lower. Synonym: English position, lateral recumbent position, semiprone position. (05 Mar 2000) |