primitive furrow
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primitive groove — n a depression or groove in the epiblast of the primitive streak that extends forward to the primitive knot * * * a lengthwise median furrow in the primitive streak of the embryo; in human embryos it is clearly visible during the third week.… … Medical dictionary
Primitive streak — Infobox Embryology Name = Primitive streak Latin = GraySubject = 6 GrayPage = 47 Caption = Surface view of embryo of a rabbit. arg. Embryonic disk. pr. Primitive streak. Caption2 = Width = 215 System = CarnegieStage = 6b Days = 15 Precursor =… … Wikipedia
Primitive ventricle — Infobox Embryology Name = PAGENAME Latin = GraySubject = 135 GrayPage = 512 Caption = Heart of human embryo of about fourteen days. Caption2 = Interior of dorsal half of heart from a human embryo of about thirty days. System = CarnegieStage = 11… … Wikipedia
furrow — A groove or sulcus. [A.S. furh] digital f. SYN: digital crease. genital f. a groove on the genital tubercle in the embryo, appearing toward the end of the second month. gluteal f. SYN: gluteal … Medical dictionary
groove — A narrow, elongate depression or furrow on any surface. SEE ALSO: sulcus. alveolobuccal g. the upper and lower half of the buccal vestibule on each side. SYN: alveolobuccal sulcus, gingivobuccal g., gingivobuccal sulcus. alveololabial g. 1. the… … Medical dictionary
Insect morphology — Legend of body parts Tagmata : A Head, B Thorax, C Abdomen. 1. antenna 2. ocelli (lower) 3. ocelli (upper) 4. compound eye 5. brain (cerebral ganglia) 6. prothorax … Wikipedia
Insect wing — Original veins and wing posture of a dragonfly. Hoverflies hovering to mate … Wikipedia
Sulcus — From the Latin for a groove, furrow, or trench. In medicine, there are many sulci (plural of sulcus) as, for example, the superior pulmonary sulcus. * * * 1. [TA] One of the grooves or furrows on the surface of the brain, bounding the several… … Medical dictionary
orthopteran — /awr thop teuhr euhn/, adj. 1. orthopterous. n. 2. an orthopterous insect. [1895 1900; < NL Orthopter(a) (see ORTHOPTERON) + AN] * * * ▪ insect Introduction broadly, any member of one of four insect orders. Orthopteran has come to be regarded… … Universalium
Cleavage (embryo) — In embryology, cleavage is the division of cells in the early embryo. The zygotes of many species undergo rapid cell cycles with no significant growth, producing a cluster of cells the same size as the original zygote. The different cells derived … Wikipedia
