Talk:Book - Contributions to Embryology Carnegie Institution No.20 part 2
Table of Specimen
Crown-
Direction of
rump
length.
Catalogue
No.
section and
thickness in
Section
photographed.
State of development of the pcriotic tissues.
millimeters.
microns
4
588
Coronal . . .
15
6-6-7
Beginning condensation of periotic mesenchyme.
9
721
Tranverse .
15
5-2-1
Distinct condensation of periotic mesenchyme.
11 ^
1121
Coronal . . .
40
6-3-4
11
353
Coronal . . .
10
16-3-4
Definite capsules of mesenchyme surrounding labyrinth.
13
485
C'oronal . . .
40
10-1-3
Membranous canals begin to separate off from main pouch.
12.5
317
Coronal . . .
20
13 5
695
Transverse.
10
16
406
Sagittal . . .
20
Condensed mesenchyme becomes precartilage.
15
719
Transverse.
40
3-7-3
14
144
Sagittal . . .
40
4-1-3
Differentiation of precartilage into permanent and tem-
porary types.
16
409
Transverse.
20
6-3-5
17.2
424
Transverse.
50
3^-4
17
296
Coronal . . .
20
Distinct capsules forming around precartilage nuclei in
some areas.
17
576
Sagittal . . .
15
21
460
Transverse.
40
14-1-1
23
966
Coronal . . .
40
30-3
23
453
Sagittal . . .
20
24
455
Transverse.
30
26.4
1008
Sagittal . . .
40
10-2-2
26
1199
Coronal . . .
40
39-1-3
27
756a
Coronal . . .
50
47-2
Beginning formation of definite periotic reticulum around
canals.
27
875
Sagittal . . .
40
Precartilage becomes true cartilage.
30
86
Coronal . . .
50
46-2
Reticular area surrounds epithelical canals.
33
145
Sagittal . . .
50
7-1-3
33
211
Sagittal . . .
50
14-3
35
199
Sagittal . . .
50
68-2
Beginning space-formation in vestibular region.
37
1318
Coronal . . .
100
42-1
37
972
Sagittal . .
50
20-1
DedifTerentiation of true cartilage into precartilage in
region of canals.
3!l
362
Sagittal . .
50
43
886
Coronal . . .
100
42-3
Rudimentary periotic cistern present and scula tympani
can be recognized.
50
84
Transverse.
50
146-2
Scala vcstibuli can be recognized.
46
95
Sagittal . . .
100
72-1
50
224
Sagittal . . .
50
20-1
50
184
Sagittal . . .
50
23-2
Rapid dcdiffcrentiation of precartilage around canals into
reticulum.
52
448
Sagittal . . .
25;
100)
3.3-2
Vascular network established around canals.
50
96
Sagittal . . .
100
12-2
51t
267
Sagittal . . .
20
29-1-2
73
1373
Transverse.
10
9-3-1
Perichondrium and nicmliraiia propria present in their
early form.
80
172
Transverse.
100
191
86
1400-30
Transverse.
100
4.5-2
130
1018
Transverse.
50
30-1
Beginning formation of i>eriotic spaces in region of canals.
