Template:Hamburger Hamilton Stages

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Hamburger Hamilton Stages  
Hamburger Hamilton Stages
Age
Identification of Stages
Before Laying
Early cleavage
3.5-4.5 hr Shell membrane of egg formed in isthmus of oviduct
During cleavage
Germ wall formed from marginal periblast
Late cleavage
4.5-24.0 hr Shell of egg formed in uterus
After Laying
1
Preprimitive streak (embryonic shield)
2
6-7 hr Initial primitive streak, 0.3-0.5 mm long
3
12-13 hr Intermediate primitive streak
4
18-19 hr Definitive primitive streak, ±1.88 mm long
5
19-22 hr Head process (notochord)
6
23-25 hr Head fold
7
23-26 hr 1 somite; neural folds
7 to 8-
ca. 23-26 hr 1-3 somites; coelom
8
26-29 hr 4 somites; blood islands
9
29-33 hr 7 somites; primary optic vesicles
9+ to 10-
ca. 33 hr 8-9 somites; anterior amniotic fold
10
33-38 hr 10 somites; 3 primary brain vesicles
11
40-45 hr 13 somites; 5 neuromeres of hindbrain
12
45-49 hr 16 somites; telencephalon
13
48-52 hr 19 somites; atrioventricular canal
13+ to 14-
ca. 50-52 hr 20-21 somites; tail bud
14
50-53 hr 22 somites; trunk flexure; visceral arches I and II, clefts 1 and 2
14+ to 15-
ca. 50-54 hr 23 somites; premandibular head cavities
15
50-55 hr 24-27 somites; visceral arch III, cleft 3
16
51-56 hr 26-28 somites; wing bud; posterior amniotic fold
17
52-64 hr 29-32 somites; leg bud; epiphysis
18
3 da 30-36 somites extending beyond level of leg bud; allantois
19
3.0-3.5 da 37- 40 somites extending into tail; maxillary process
20
3.0-3.5 da 40-43 somites; rotation completed; eye pigment
21
3.5 da 43-44 somites; visceral arch IV, cleft 4
22
3.5-4.0 da Somites extend to tip of tail
23
4 da Dorsal contour from hindbrain to tail is a curved line
24
4.5 da Toe plate
25
4.5-5.0 da Elbow and knee joints
26
5 da 1st 3 toes
27
5.0-5.5 da Beak
28
5.5-6.0 da 3 digits, 4 toes
29
6.0-6.5 da Rudiment of 5th toe
30
6.5-7.0 da Feather germs; scleral papillae; egg tooth
31
7.0-7.5 da Web between 1st and 2nd digits
32
7.5 da Anterior tip of mandible has reached beak
33
7.5-8.0 da Web on radial margin of wing and 1st digit
34
8 da Nictitating membrane
35
8.5-9.0 da Phalanges in toes
36
10 da Length of 3rd toe from tip to middle of metatarsal joint = 5.4 ±0.3 mm; length of beak from anterior angle of nostril to tip of bill = 2.5mm; primordium of comb; labial groove; uropygial gland
37
11 da Length of 3rd toe = 7.4 ±0.3mm; length of beak = 3.0 mm
38
12 da Length of 3rd toe = 8.4 ± 0.3 mm; length of beak = 3.1 mm
39
13 da Length of 3rd toe = 9.8 ± 0.3 mm; length of beak = 3.5 mm
40
14 da Length of beak = 4.0 mm; length of 3rd toe = 12.7 ± 0.5 mm
41
15 da Length of beak from anterior angle of nostril to tip of upper bill = 4.5 mm; length of 3rd toe = 14.9 ± 0.8 mm
42
16 da Length of beak = 4.8 mm; length of 3rd toe = 16.7 ± 0.8 mm
43
17 da Length of beak = 5.0 mm; length of 3rd toe = 18.6 ± 0.8 mm
44
18 da Length of beak = 5.7 mm; length of 3rd toe = 20.4 ± 0.8 mm
45
19-20 da Yolk sac half enclosed in body cavity; chorio-allantoic membrane contains less blood and is "sticky" in living embryo
46
20-21 da Newly-hatched chick
Original paper (and all data) was republished in 1992.

<pubmed>1304821</pubmed>| PDF