Category:Somite

From Embryology

This Embryology category shows content related to somite development. In human development, somites form in pairs from week 3 in a rostrocaudal direction and contribute to the body axial skeleton, skeletal muscle and dermis of the skin.


Links: Somitogenesis | Mesoderm | Axial Skeleton Development | Muscle Development | Integumentary Development


Human Embryo Somite Number
Week Days Carnegie Stage Somite Number (pairs)
Week 3 19 - 21 9    image 1 - 3
Week 4 22 - 23 10   image 4 - 12
Week 4 23 - 26 11   image 13 - 20
Week 4 26 - 30 12   image 21 - 29
Week 5 28 - 32 13   image 30
Week 5 31 - 35 14   image 30+


Mouse Somitogenesis
Theiler Stages
Age E
(range dpc)
Somite
Number
Rat Witschi
Stage
Human Stage
12 8 1 - 7 14-15 9
13 8.5 (8 - 9.25) 8 - 12 15 10
14 9 (8.5 - 9.75) 13 - 20 16 11
15 9.5 (9 - 10.25) 21 - 29 17 - 19 12
16 10 (9.5 - 10.75) 30 - 34 20 - 21 13 - 15
17 10.5 (10 - 11.25) 35 - 39 24 - 25 13 - 15
18 11 (10.5 - 11.25) 40 - 44 25 - 26 13 - 15
19 11.5 (11 - 12.25) 45 - 47 26 - 27 16
20 12 (11.5 - 13) 48 - 51 28 17
21 13 (12.5-14) 52 - 55 29 - 30 18 - 19
22 14 (13.5-15) 56 - 60 31 20 - 23
23 15 60 + 32 Fetal period
Mouse Somitogenesis  
Theiler
Stages
Age E
(range dpc)
Somite
Number
Rat Witschi
Stage
Human Stage
12 8 1 - 7 14-15 9
13 8.5 (8 - 9.25) 8 - 12 15 10
14 9 (8.5 - 9.75) 13 - 20 16 11
15 9.5 (9 - 10.25) 21 - 29 17 - 19 12
16 10 (9.5 - 10.75) 30 - 34 20 - 21 13 - 15
17 10.5 (10 - 11.25) 35 - 39 24 - 25 13 - 15
18 11 (10.5 - 11.25) 40 - 44 25 - 26 13 - 15
19 11.5 (11 - 12.25) 45 - 47 26 - 27 16
20 12 (11.5 - 13) 48 - 51 28 17
21 13 (12.5-14) 52 - 55 29 - 30 18 - 19
22 14 (13.5-15) 56 - 60 31 20 - 23
23 15 60 + 32 Fetal period
Chicken Somitogenesis
HH Stages
Age
Somite Number
7
23-26 hr 1 somite
7 to 8-
ca. 23-26 hr 1-3
8
26-29 hr 4
9
29-33 hr 7
9+ to 10-
ca. 33 hr 8-9
10
33-38 hr 10
11
40-45 hr 13
12
45-49 hr 16
13
48-52 hr 19
13+ to 14-
ca. 50-52 hr 20-21
14
50-53 hr 22
14+ to 15-
ca. 50-54 hr 23
15
50-55 hr 24-27
16
51-56 hr 26-28
17
52-64 hr 29-32
18
3 da 30-36
19
3.0-3.5 da 37- 40 extending into tail
20
3.0-3.5 da 40-43
21
3.5 da 43-44
22
3.5-4.0 da Somites extend to tip of tail
Hamburger Hamilton Stages | Chicken Development
Chicken Somitogenesis  
HH Stages
Age
Somite Number
7
23-26 hr 1 somite
7 to 8-
ca. 23-26 hr 1-3
8
26-29 hr 4
9
29-33 hr 7
9+ to 10-
ca. 33 hr 8-9
10
33-38 hr 10
11
40-45 hr 13
12
45-49 hr 16
13
48-52 hr 19
13+ to 14-
ca. 50-52 hr 20-21
14
50-53 hr 22
14+ to 15-
ca. 50-54 hr 23
15
50-55 hr 24-27
16
51-56 hr 26-28
17
52-64 hr 29-32
18
3 da 30-36
19
3.0-3.5 da 37- 40 extending into tail
20
3.0-3.5 da 40-43
21
3.5 da 43-44
22
3.5-4.0 da Somites extend to tip of tail
Hamburger Hamilton Stages | Chicken Development

Subcategories

This category has only the following subcategory.

Media in category ‘Somite’

The following 45 files are in this category, out of 45 total.