labial groove


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labial groove

A furrow that develops in each of the embryonic jaws and that will give rise to the vestibule separating the lips from the gums.
See also: groove
References in periodicals archive ?
Two (or four) of the COSp are on the external distal edge of the II segment, and one is placed internally closer to the labial groove (Figure 21(f)).
(4) chaetica sensilla (CH1, CH2, and CH3) present and placed in groups or rows distributed along the labium near the labial groove on the dorsal side and also several chaetica sensilla unevenly scattered on the surface of that segment;
The labial groove is narrow and deep, projecting towards the base; the trigonid is angularly V-shaped with narrow and short paralophid and a right-angled metalophid.