Previous Stage Stage Index Anatomy Reference Next Stage

Hamburger and Hamilton Stage 25

HH25 (4.5-5 days).
Elbow and knee joints distinct.
Digital plate in wing distinct, but no digits.
Faint grooves demarcate the third toe on leg.
Maxillary process lengthened, meeting wall of nasal groove (notice the notch at point of fusion).
Three protuberances on each side of 1st visceral cleft.
In dorsal view, 'a,' 'b,' and 'd' appear as round knobs, and 'c' as a flat ridge.
Part 'f' ('collar') conspicuous and projects distinctly over the surface.
Dorsal part of 3rd arch still visible.
3rd and 4th clefts reduced to small pits.


  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