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Hamburger and Hamilton Stage 30

HH30 (6.5-7 days).
The three segments of wing and leg clearly demarcated, bent at elbow and knee joints.
Distinct grooves between digits 1 and 2.
Webs between digits 1/2 and between all toes slightly curved, concave lines.
Mandibular process approaches beak, but gap between the two still conspicuous.
Lengthening of neck between 'collar' and mandible very conspicuous.
'Collar' begins to flatten.
Two dorsal rows of feather germs to either side of spinal cord at brachial level.
Three rows at level of legs; indistinct at thoracic level.
None on thigh.
Scleral papillae: one on either side of choroid fissure; never more than two.
Egg tooth distinct, slightly protruding.


  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