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== Carnegie Stage Table ==
== Carnegie Stage Table ==
Weeks shown in the table below are post ovulation age, for Gestational age (GA) measured from last menstrual period, add 2 weeks.
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Revision as of 14:01, 5 October 2012

Carnegie Stage Table

Weeks shown in the table below are post ovulation age, for Gestational age (GA) measured from last menstrual period, add 2 weeks.

Stage
Days (approx)
Size
(mm)
Images
(not to scale)
Events
1
1
(week 1)
0.1 - 0.15
Link=Carnegie_stage_1
fertilized oocyte, zygote, pronuclei
2
2 - 3
0.1 - 0.2
Link=Carnegie_stage_2
morula cell division with reduction in cytoplasmic volume, blastocyst formation of inner and outer cell mass
3
4 - 5
0.1 - 0.2
Link=Carnegie_stage_3
loss of zona pellucida, free blastocyst
4
5 - 6
0.1 - 0.2
Link=Carnegie_stage_4
attaching blastocyst
5
7 - 12
(week 2)
0.1 - 0.2
Link=Carnegie_stage_5
implantation
6
13 - 15
0.2
Link=Carnegie_stage_6
extraembryonic mesoderm, primitive streak, gastrulation
7
15 - 17
(week 3)
0.4
Link=Carnegie_stage_7
gastrulation, notochordal process
8
17 - 19
1.0 - 1.5
Link=Carnegie_stage_8
primitive pit, notochordal canal
9
19 - 21
1.5 - 2.5
Link=Carnegie_stage_9
Somitogenesis Somite Number 1 - 3 neural folds, cardiac primordium, head fold
10
22 - 23
(week 4)
2 - 3.5
Link=Carnegie_stage_10
Somite Number 4 - 12 neural fold fuses
11
23 - 26
2.5 - 4.5
Link=Carnegie_stage_11
Somite Number 13 - 20 rostral neuropore closes
12
26 - 30
3 - 5
Link=Carnegie_stage_12
Somite Number 21 - 29 caudal neuropore closes
13
28 - 32
(week 5)
4 - 6
Link=Carnegie_stage_13
Somite Number 30 leg buds, lens placode, pharyngeal arches
Stage 13/14 shown in serial embryo sections series of Embryology Program
14
31 - 35
5 - 7
Link=Carnegie_stage_14
lens pit, optic cup
15
35 - 38
7 - 9
Link=Carnegie_stage_15
lens vesicle, nasal pit, hand plate
16
37 - 42
(week 6)
8 - 11
Link=Carnegie_stage_16
nasal pits moved ventrally, auricular hillocks, foot plate
17
42 - 44
11 - 14
Link=Carnegie_stage_17
finger rays
18
44 - 48
(week 7)
13 - 17
Link=Carnegie_stage_18
ossification commences
19
48 - 51
16 - 18
Link=Carnegie_stage_19
straightening of trunk
20
51 - 53
(week 8)
18 - 22
Link=Carnegie_stage_20
upper limbs longer and bent at elbow
21
53 - 54
22 - 24
Link=Carnegie_stage_21
hands and feet turned inward
Stage 22 shown in serial embryo sections series of Embryology Program
22
54 - 56
23 - 28
Link=Carnegie_stage_22
eyelids, external ears
23
56 - 60
27 - 31
Link=Carnegie_stage_23
rounded head, body and limbs
Following this stage Fetal Development occurs until birth (approx 40 weeks)

The embryos shown in the table are from the Kyoto and Carnegie collection and other sources.