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Hamburger and Hamilton Stage 38

HH38 (12 days).
Primordia of scales marked off over entire surface of leg; ridges not yet grown out to overlap surface.
Tips of toes with ventral centre of cornification and more extensive dorsal one.
Main plantar pad ridged in profile.
Length of 3rd toe: 8.4 0.3 mm.
Labial groove marked off by deep furrow at end of each jaw.
Length of beak (anterior angle of nostril to tip of bill): 3.1 mm.
Feather germs: coverts of web of wing becoming conical.
External auditory meatus surrounded by germs.
Sternum covered except midline.
Upper eyelid covered with newly formed germs; lower lid naked except for 2-3 rows at its edge.
Lower eyelid covers 2/3-3/4 of cornea.
Opening between lids much reduced.


  1. TXT - Text Format
    The ABSTRACT ONTOLOGY (NOT Staged/Timed) with all pathways to child nodes materialised, in Plain Text only, as a Tree Report.

  2. OBO - OBO Format
    The ABSTRACT ONTOLOGY (NOT Staged/Timed) in OBO Flat File Format, version 1.2, available for viewing/editing using OBO-Edit.


  1. H. Eyal-Giladi and S. Kochav
    From cleavage to primitive streak formation: A complementary normal table and a new look at the first stages of the development of the chick : I. General morphology
    Developmental Biology, Volume 49, Issue 2, April 1976, Pages 321-337

  2. V. Hamburger and H.L. Hamilton
    A series of normal stages in the development of the chick embryo
    Journal of Morphology, 1951, Volume 88, Pages 49-92 (reprinted in Developmental Dynamics, December 1992, Volume 195, Issue 4, pages 231-72)

  3. R. Bellairs and M. Osmond
    The Atlas of Chick Development
    Academic Press, ISBN 0-12-084790-6, 1998

  4. C.D. Stern and P.W.H. Holland (Ed.s)
    Essential Developmental Biology: A Practical Approach
    Oxford University Press, ISBN 0-19-963423-8, 1993

  5. M.A.J. Selleck and C.D. Stern
    Fate mapping and cell lineage analysis of Hensen's node in the chick embryo
    Development, Volume 112, Pages 615-626, 1991