premaxilla


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premaxilla

 [pre-mak´sĭ-lah]
a separate element derived from the median nasal processes in the embryo, which later fuses with the maxilla.

pre·max·il·la

(prē'mak-sil'ă),
1. ☆ official atlternate term for incisive bone
2. The central isolated bony part in a complete bilateral cleft of the lip.
[pre- + L. maxilla, jawbone]

premaxilla

/pre·max·il·la/ (-mak-sil´ah)
2. the embryonic bone that later fuses with the maxilla to form the incisive bone.

premaxilla

(prē′măk-sĭl′ə)
n. pl. pre·maxillae (-măk-sĭl′ē)
Either of two bones located in front of and between the maxillary bones in the upper jaw of vertebrates.

pre·max′il·lar′y (-măk′sə-lĕr′ē) adj.

pre·max·il·la

(prē'mak-sil'ă)
1. Synonym(s): incisive bone.
2. Central isolated bony part in a complete bilateral cleft of the lip.
[pre- + L. maxilla, jawbone]

premaxilla (prē´maksil´ə),

n the embryonic structure that forms the anterior part of the maxillae.
premaxilla, floating,
n See premaxilla, loose.
premaxilla, loose,
n 1. (floating premaxilla) the nonunion of the premaxillary process with the lateral maxillary segments, so that the premaxilla is loose, or floating. The position of the loose premaxilla in relation to the lateral maxillary segments varies among patients.
n 2. the administration of a tranquilizing drug, a drug that influences blood clotting time or any other drug that produces a preplanned set of conditions and is administered preceding any dental procedures.

premaxilla

the incisive bone, the bone which bears the upper incisor teeth.

cleft premaxilla
see cleft lip.
References in periodicals archive ?
66 in SL (two largest specimens); preventral area flattened, with pelvic spines reaching to half pectoral fin length, under skin; trunk scales 7/38/5; anal fin iii,20; anterior part of head Deuterodon-like, with multicuspid teeth, but the snout not very elongate, shorter than eye diameter, equal to the maxilla in projection; maxilla reaching to vertical through anterior margin of eye; premaxilla 2/5, broadest tooth with up to 9 cusps; maxilla with 3 multicuspid teeth; mandible with 67 teeth, anteriormost with 7-9 cusps; a humeral spot, a longitudinal band from dorsal fin to end of middle caudal fin rays, enlarged on peduncle.
The dentary, maxilla, premaxilla, opercle, and cleithrum were dissected from the left side of each fish and measured to the nearest 0.
The two species could be distinguished by the placement of the first process of the premaxilla, which is perpendicular to the premaxilla in the Argentine sandperch, and backinclined in the Brazilian sandperch, drawing an acute angle with the premaxilla (Herrera and Cousseau, 1996).
5): anterior arm of suspensorium consisting of palatine, relatively broad dorsally, tapering to point about midway along ectopterygoid; ectopterygoid articulating with quadrate along its anterodorsal edge; metapterygoid very thin, "needle-like", not articulating with quadrate or its small cartilaginous posterior edge; no symplectic process on preopercle; ascending process of premaxilla extending dorsally to anterodorsal edge of rostral cartilage; maxilla narrow, lacking process along shaft, with ventral tip curved anteriorly; dentary reduced, lacking large pocket typically receiving anguloarticular; anguloarticular articulating with dentary along ventral groove in dentary and in small anterior pocket near symphysis of dentary.
Premaxilla with series of conical teeth laterally and band of villiform teeth medially; at anterior end of jaw one or two canine(s) adjacent to patch of very small teeth; symphysis edentate.
Upper jaw with outer row of curved, enlarged, spaced canines along length of premaxilla, gradually decreasing in size posteriorly until not much larger than inner rows; two to three irregular inner rows of smaller teeth almost reaching distal tip of premaxilla, innermost row of slender, slightly curved, spaced teeth almost as long as outer row, from symphysis to bend of jaw in males and some females.
In juveniles premaxilla anteriorly with three rows of small teeth, outer row teeth slightly larger; teeth absent from horizontal arm: lower jaw with one row laterally and broad band of teeth anteriorly.
4% HL); mouth small, premaxilla with fleshy lips and prominent, broad-based posterior lobe, maxilla extending to anterior rim of ventral orbit, ocular-side maxilla shorter than blind-side maxilla, ocular-side maxilla length 20.
Premaxilla and dentary with many irregularly distributed unicuspid, slightly curved teeth of different sizes and small number of larger teeth in outer row of upper and lower jaws.