prenasal


Also found in: Medical, Wikipedia.

prenasal

(priːˈneɪzəl)
n
(Anatomy) a bone in the front of the nose
adj
(Anatomy) in front of the nose or nasal region
Mentioned in ?
References in periodicals archive ?
They all arise from a lack of regression of a dural diverticulum in the prenasal space that extends through the embryologic foramen cecum or the fonticulus frontalis.
On MRI, nasal dermal sinus tracts will present as T1hypointense linear tract extending from the foramen cecum through the subcutaneous soft tissues of the midline nasal bridge to the prenasal space.
Our enthusiasm about things like screening for Down syndrome with sophisticated techniques such as nuchal translucency, nasal bone measurement and tricuspid incompetence, as well as the new additions like prenasal thickness measurement, must therefore be tempered by the knowledge that the majority of women do not even have a dating scan.
25 shorter than (DR); nasals divided, each nostril located between prenasal and postnasal edges; prenasals smaller than postnasals, with the later also being higher; horizontal length of eye 1.
Characters studied without reference to region were distribution of denticles on the dorsal (DZ) and ventral (DVS) surfaces of the rostrum (both measured from the distal tip), length (P) from the distal tip of the rostrum to the distal extremity of the prenasal bone, presence or absence of denticles on the prenasal bone, and length from the tip along the ventral surface where the fused premaxillae divide (VSPM) into separate bones.
The underlying form of the second stem in each two stem sequence does not have an initial nasal component because there is no contrast in this context between stems beginning with a voiced stop or affricate and ones beginning with a prenasal.
Characters studied without reference to region were: distribution of denticles on the dorsal surface of the rostrum measured from the distal tip (DZ); length from distal tip where denticles are absent from the ventral mid-line (DVS); length from the distal tip to the distal extremity of t he prenasal (P); length from tip where fused premaxillae divide into separate bones (VSPM); and presence or absence of denticles on the prenasal.
m]f] with a constraint I refer to here and below as PRENASAL in (8).