| nucleus masticatorius | <anatomy, nerve> A group of motor neurons innervating the muscles of mastication (masseter, temporalis, internal and external pterygoid muscles) and the musculi tensor tympani and tensor veli palatini. The nucleus lies in the upper pontine tegmentum medial to the main sensory nucleus of the trigeminus. Synonym: nucleus motorius nervi trigemini, masticatory nucleus, motor nucleus of trigeminus, nucleus masticatorius. (05 Mar 2000) |
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| spasmus | Synonym: spasm. Origin: L. Fr. G. Spasmos, spasm (05 Mar 2000) |
| spasmus caninus | The semblance of a grin caused by facial spasm especially in tetanus. Synonym: canine spasm, cynic spasm, risus sardonicus, sardonic grin, spasmus caninus, trismus sardonicus. Origin: L. Risus, laugh + caninus, doglike (05 Mar 2000) |
| spasmus coordinatus | Compulsive movements, such as imitative or mimic tics, festination, etc. (05 Mar 2000) |
| spasmus glottidis | A spasmodic closure of the glottis, lasting a few seconds, followed by a noisy inspiration. Compare: laryngitis stridulosa. Synonym: pseudocroup, spasmus glottidis. (05 Mar 2000) |
| spasmus nictitans | Involuntary spasmodic winking. Synonym: spasmus nictitans, winking spasm. (05 Mar 2000) |
| spasmus nutans | A fine nystagmus, sometimes rotary, sometimes monocular, associated with head-nodding movements. Synonym: nodding spasm. (05 Mar 2000) |
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