Cusp
In reference to heart valves, one of the triangular segments of the valve which opens and closes with the flow of blood. In reference to teeth, a raised area of the biting surface.
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1. In dentistry, a conical elevation arising on the surface of a tooth from an independent calcification center. SEE ALSO: dental tubercle. 2. A leaflet of one of the heart's valves. SYN: cuspis [TA]. [L. cuspis, point]
- anterior c. of mitral valve [TA] the ventrally placed and larger of the two leaflets that come together during ventricular systole to close the left atrioventricular orifice; it attaches to the septal aspect of the orifice. SYN: cuspis anterior valvae atrioventricularis sinistrae [TA], anterior c. of left atrioventricular valve, cuspis anterior valvae mitralis.
- anterior c. of tricuspid valve [TA] the largest and most ventrally placed of the three leaflets that come together during ventricular systole to close the right atrioventricular orifice. SYN: cuspis anterior valvae atrioventricularis dextrae [TA], anterior c. of right atrioventricular valve, cuspis anterior valvae tricuspidalis.
- c. of Carabelli a fifth c. found on the maxillary first molars, usually located lingual to the mesiolingual c..
- posterior c. of mitral valve [TA] the dorsally placed and smaller of the two leaflets that come together during ventricular systole to close the left atrioventricular orifice; it attaches to the mural aspect of the orifice. SYN: cuspis posterior valvae atrioventricularis sinistrae [TA], cuspis posterior valvae mitralis, posterior c. of left atrioventricular valve.
- posterior c. of tricuspid valve [TA] the medium-sized and most dorsally placed of the three leaflets that come together during ventricular systole to close the right atrioventricular orifice. SYN: cuspis posterior valvae atrioventricularis dextrae [TA], cuspis posterior valvae tricuspidalis, posterior c. of right atrioventricular valve.
- semilunar c. one of the three semilunar segments serving as the three cusps of a valve preventing regurgitation at the beginning of the aorta; a similar valve guards the entrance of the pulmonary trunk; the segments are named, respectively, anterior, right, and left in the pulmonary valve, and posterior, right, and left in the aortic valve.
- septal c. of tricuspid valve [TA] the leaflet of the tricuspid valve located adjacent to the interventricular septum. SYN: cuspis septalis valvae atrioventricularis dextrae [TA], cuspis septalis valvae tricuspidalis, septal c. of right atrioventricular valve.
- talon c. an anomalous c. that projects lingually from the cingulum of permanent incisors. [Eng. claw, heel, fr. O.Fr., fr. L. talus, ankle]
- c. of tooth [TA] an elevation or mound on the crown of a tooth making up a part of the occlusal surface. SYN: cuspis dentis [TA], cuspis coronae.

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cusp 'kəsp n
1) a point on the grinding surface of a tooth
2) a fold or flap of a cardiac valve
cus·pal 'kəs-pəl adj

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n.
1. any of the cone-shaped prominences on teeth, especially the molars and premolars.
2. a pocket or fold of the membrane (endocardium) lining the heart or of the layer of the wall of a vein, several of which form a valve. When the blood flows backwards the cusps fill up and become distended, so closing the valve.

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(kusp) [L. cuspis point] 1. a tapering projection; see cuspis and valvula. 2. cuspis dentis.

Cusps of the heart valves.


Medical dictionary. 2011.

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  • Cusp — may refer to: Beach cusps, a pointed and regular arc pattern of the shoreline at the beach Behavioral cusp (psychology) an important behavior change with far reaching consequences Cusp catastrophe Cusp (astrology), a boundary between zodiac signs …   Wikipedia

  • cusp — [kʌsp] n [Date: 1500 1600; : Latin; Origin: cuspis point ] 1.) technical the point formed where two curves join 2.) be on the cusp of sth [singular] to be at the time when a situation or state is going to change ▪ The country was on the cusp of… …   Dictionary of contemporary English

  • cusp — [ kʌsp ] noun count 1. ) TECHNICAL the point where two curves meet 2. ) a time when one situation or stage ends and another begins: the problems confronting Africa on the cusp of the millennium on the cusp someone who was born on the cusp was… …   Usage of the words and phrases in modern English

  • Cusp — Cusp, v. t. [imp. & p. p. {Cusped} (k[u^]spt); p. pr. & vb. n. {Cusping}.] To furnish with a cusp or cusps. [1913 Webster] …   The Collaborative International Dictionary of English

  • cusp — [kusp] n. [L cuspis (gen. cuspidis), point, pointed end, spear] 1. a point or pointed end; apex; peak 2. Anat. a) any of the elevations on the chewing surface of a tooth b) any of the triangular flaps of a heart valve 3. Archit. a projecting… …   English World dictionary

  • Cusp — (k[u^]sp), n. [L. cuspis, idis, point, pointed end.] [1913 Webster] 1. (Arch.) A triangular protection from the intrados of an arch, or from an inner curve of tracery. [1913 Webster] 2. (Astrol.) The beginning or first entrance of any house in… …   The Collaborative International Dictionary of English

  • cusp — cusp·ing; cusp; …   English syllables

  • cusp — ► NOUN 1) a pointed end where two curves meet. 2) each of the pointed ends of a crescent, especially of the moon. 3) a cone shaped prominence on the surface of a tooth. 4) Astrology the initial point of an astrological sign or house. 5) a point… …   English terms dictionary

  • cusp — 1580s, from L. cuspis point, spear, pointed end, head, of unknown origin. Astrological use is earliest …   Etymology dictionary

  • cusp — UK [kʌsp] / US noun [countable] Word forms cusp : singular cusp plural cusps 1) in mathematics, for example, the point where two curves meet 2) a time when one situation or stage ends and another begins the problems confronting Africa on the cusp …   English dictionary

  • Cusp — Cette page d’homonymie répertorie les différents sujets et articles partageant un même nom. Le terme cusp est un terme mathématique anglais recouvrant plusieurs notions distinctes. Parfois employé tel quel dans les textes mathématiques français,… …   Wikipédia en Français

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