| skeleton thoracicus | An alternate term for thoracic cage. (05 Mar 2000) |
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| fibrous skeleton of heart | A complex framework of dense collagen forming four fibrous rings (annuli fibrosi), which surround the ostia of the valves, a right and left fibrous trigone, formed by connecting the rings, and the membranous portions of the interatrial and interventricular septa; it is found in association with the base of the ventricles, i.e., at the level of the coronary sulcus; its functions include: 1) contributing reinforcement of the valvular ostia while providing attachment for the leaflets and cusps of the valves; 2) providing origin and insertion for the myocardium; and 3) serving as a sort of electrical "insulator," separating the electrically conducted impulses of the atria and ventricles and providing passage for the common atrioventricular bundle of conductive tissue through the right fibrous trigone and membranous interventricular septum. Synonym: cardiac fibrous skeleton, cardiac skeleton, skeleton of heart. (05 Mar 2000) |
| angle of jaw | <anatomy> The angle formed by the lower margin of the body and the posterior margin of the ramus of the mandible. Synonym: angulus mandibulae, angle of jaw. (05 Mar 2000) |
| parrot jaw | A condition caused by protrusion of incisor teeth. (05 Mar 2000) |
| centric jaw relation | The most retruded physiologic relation of the mandible to the maxillae to and from which the individual can make lateral movements; it is a condition which can exist at various degrees of jaw separation, and it occurs around the terminal hinge axis, the most posterior relation of the mandible to the maxillae at the established vertical relation See: eccentric relation. Synonym: median retruded relation, median relation. (05 Mar 2000) |
| rest jaw relation | The postural relation of the mandible to the maxillae when the patient is resting comfortably in the upright position and the condyles are in a neutral unstrained position in the glenoid fossa. Synonym: rest jaw relation, unstrained jaw relation. (05 Mar 2000) |
| crackling jaw | Chronic subluxation with clicking on motion. (05 Mar 2000) |
| Hapsburg jaw | Prognathism and pouting lower lip, characteristic of the Hispano-Austrian imperial dynasty. (05 Mar 2000) |
| progonoma of jaw | A benign neoplasm of neuroectodermal origin that most often involves the anterior maxilla of infants in the first year of life. It presents clinically as a rapidly growing blue-black lesion producing a destructive radiolucency; histologically, it is characterised by small round undifferentiated tumour cells interspersed with larger polyhedral melanin-producing cells arranged in an alveolar configuration. Synonym: melanoameloblastoma, pigmented ameloblastoma, pigmented epulis, progonoma of jaw, retinal anlage tumour. (05 Mar 2000) |
| protrusive jaw relation | A jaw relation resulting from a protrusion of the mandible. (05 Mar 2000) |
| inversed jaw-winking syndrome | <syndrome> When there are supranuclear lesions of the trigeminal nerve, touching the cornea may produce a brisk movement of the mandible to the opposite side. (05 Mar 2000) |
| terminal jaw relation record | A record of the relationship of the mandible to the maxillae made at the vertical relation of occlusion and at the centric position. (05 Mar 2000) |
| jaw | 1. <anatomy> One of the bones, usually bearing teeth, which form the framework of the mouth. Hence, also, the bone itself with the teeth and covering. In the plural, the mouth. 2. Anything resembling the jaw of an animal in form or action; especially, pl, the mouth or way of entrance; as, the jaws of a pass; the jaws of darkness; the jaws of death. 3. <machinery> A notch or opening. A notched or forked part, adapted for holding an object in place; as, the jaw of a railway-car pedestal. See Axle guard. One of a pair of opposing parts which are movable towards or from each other, for grasping or crushing anything between them, as, the jaws of a vise, or the jaws of a stone-crushing machine. 4. The inner end of a boom or gaff, hollowed in a half circle so as to move freely on a mast. 5. Impudent or abusive talk. Jaw bit, a bar across the jaws of a pedestal underneath an axle box. Jaw breaker, a word difficult to pronounce. Jaw rope, a rope which holds the jaws of a gaff to the mast. Jaw tooth, a molar or grinder; a back tooth. Origin: A modification of chaw, formed under the influence of F. Joue the cheek. See Chaw, Chew. Source: Websters Dictionary (01 Mar 1998) |
| jaw abnormalities | Congenital absence of or defects in structures of the jaw. (12 Dec 1998) |
| jaw bone | The jaw bone. (27 Sep 1997) |