Extraembryonic organs
MARCELA BUCHTOVA
30. 3. 2023
Extraembryonic organs
Yolk sack
Placenta
2
Yolk sack
5
Yolk sack
6
Yolk placenta
7
Amnion
8
Amnion
9
Chorion
10
Extraembryonic membranes
Allantois
11
Fetal blood circulation
12
Umbilical cord
13
Birds
14
15
16
Placenta
17
Chorion frondosum
Chorion laeve
Placenta diffusa (Eq, Su)
Placenta cotyledonata (Bo)
Placenta zonaria (Ca, Fe)
Placenta discoidea (Mu, Ho)
Placenta types
18
Placenta diffusa
19
Placentom:
- caruncle (M)
- cotyledon (F)
Placenta cotyledonata
20
Placenta zonaria
21
Placenta discoidea
22
Pars fetalis: endothelium of chorium vessels, mesenchyme, superficial
epithelium of chorium
Pars materna: epithelium of endometrium, lamina propria mucosae,
endothelium of vessels of endometrium
semiplacenta x placenta vera
Typys of placentas – number of layers
23
A – placenta epitheliochorialis (F-3, M-3)
– Su, Eq
B – placenta syndesmochorialis (F-3, M-2)
– Bo, Ov
C – placenta endotheliochorialis (F-3, M-1)
– Fe, Ca
D – placenta haemochorialis (F-3)
– Ho, rodents
pars fetalis x pars materna
24
Placenta epitheliochorialis
25
26
Placenta haemochorialis
27
Placenta haemochorialis
28
Placenta haemochorialis
29
30
31