| lateral medullary syndrome | <syndrome> A syndrome due usually to thrombosis, characterised by dysarthria, dysphagia, staggering gait, and vertigo, and marked by hypotonia, incoordination of voluntary movement, nystagmus, Horner's syndrome on the ipsilateral side, and loss of pain and temperature senses on the side of the body opposite to the lesion. Synonym: lateral medullary syndrome, Wallenberg's syndrome. (05 Mar 2000) |
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| lateral meniscus | A flat disc-shaped ligament which stabilises and supports the outer aspect of the knee joint. Not as commonly injured as the medical meniscus ligament in knee sprains. (27 Sep 1997) |
| lateral mesoderm | The peripheral thinned-out portion of intraembryonic mesoderm which is continuous with the extraembryonic mesoderm beyond the margins of the embryonic disk; in it develops the intraembryonic celom. Synonym: lateral mesoderm. (05 Mar 2000) |
| lateral midpalmar space | The more lateral (radial) of the central palmar spaces, bounded laterally by the thenar compartment; related distally to the synovial tendon sheath of the index finger and proximally to the common flexor sheath. Synonym: lateral midpalmar space. (05 Mar 2000) |
| lateral movement | In dentistry, movement of the mandible to the side. (05 Mar 2000) |
| lateral myocardial infarction | Infarction involving only the lateral wall of the heart, producing indicative electrocardiographic changes confined to leads I, aVL, V5, and V6. (05 Mar 2000) |
| lateral nucleus of medulla oblongata | A group of cells in the medulla oblongata, located between the inferior olive and the descending trigeminal nucleus, receiving fibres from the spinal cord and motor cortex and projecting to the cerebellum. Synonym: nucleus lateralis medullae oblongatae, lateral reticular nucleus. (05 Mar 2000) |
| lateral nucleus of thalamus | The largest of the major subdivisions of the thalamus; the composite lateral nucleus includes, from before backward, the nucleus lateralis anterior or dorsalis, nucleus lateralis intermedius, nucleus lateralis posterior, and pulvinar; together, these cell groups form most of the free dorsal surface of the posterior half of the thalamus and project to a very large region of parietal, occipitoparietal, and temporal cortex; its afferent connections are largely obscure, but the nucleus lateralis posterior and the pulvinar receive a projection from the superior colliculus. Synonym: nucleus lateralis thalami. (05 Mar 2000) |
| lateral oblique radiograph | A radiographic view of the mandible, revealing one side of the mandible from symphysis to condyle by displacing the other side upwards. (05 Mar 2000) |
| lateral occipital artery | <anatomy, artery> One of the terminal branches of the posterior cerebral artery; it supplies, by several named branches, the lateral portions of the temporal lobe. Synonym: arteria occipitalis lateralis. (05 Mar 2000) |
| lateral occipital sulcus | One of several variable sulci on the lateral aspect of the occipital lobe of each cerebral hemisphere, bounding the lateral occipital convolutions. Synonym: sulcus occipitalis lateralis. (05 Mar 2000) |
| lateral occipitotemporal gyrus | An extremely long convolution extending lengthwise over the inferior aspect of the temporal and occipital lobes, demarcated medially by the collateral sulcus from the lingual gyrus and the anterior part of the parahippocampal gyrus, laterally by the inferior temporal sulcus from the inferior temporal gyrus. Synonym: gyrus occipitotemporalis lateralis, gyrus fusiformis, lateral occipitotemporal gyrus, lobulus fusiformis. (05 Mar 2000) |
| lateral occlusion | Malposition of a tooth or an entire dental arch in a direction away from the midline. (05 Mar 2000) |
| lateral orbitofrontal branch | <anatomy, artery> A branch of the insular part of the middle cerebral artery distributed to the cortex of the lateral, inferior part of the frontal lobe. Synonym: arteria frontobasalis lateralis, ramus orbitofrontalis lateralis, lateral orbitofrontal branch, orbitofrontal artery. (05 Mar 2000) |
| lateral palpebral commissure | The union of the upper and lower eyelids adjacent to the lateral angle. Synonym: commissura palpebrarum lateralis. (05 Mar 2000) |