DECIDUAS

 DECIDUA:-

The decidua is the endometrium of pregnant uterus.

DECIDUAL REACTION:-

After implantation influence of progestron ↑endometrium structure and secretion is called decidual reaction.

LAYER OF DECIDUA OR ENDOMETRIUM:-

(i) superficial compact layer

(ii) intermediate spongy layer                                                

                        (iii) thin basal layer

SPECIAL POINT:-

⦁ Placenta Implantation in spongy layer

⦁ Placenta seperation in spongy layer

⦁ Mucosa regeneration in basal layer

After implantation known these layer in name--------

⦁ superficial compact- decidua capsularis or reflexa

⦁ spongy layer -decidua vera or parietalis

⦁ basal layer decidua basalis or serotina

FUNCTION OF DECIDUS:-

⦁ Necessary for implantation

⦁ Nutrition to the early stage of growing ovum (Glycogens  fat)

⦁ Decidus basalis is formation of placenta

PLACENTA :-

Human placenta is discoid - because of its shape

Hemochorial- because of direct  contact of chorion and maternal blood .

Deciduate- because of maternal tissue is shed following delivery (shedding after delivery)

Blastocyst differentiate in to :-

(i)outer trophoblast  ectodesm      (ii) inner cell mass 

↓ ↓

just before implantation        differentiate into embryo

Further Differentiate in to

↓

      ↓

                cytotrophoblast syncytotrophoblast

(inner layer) (outer layer)

DEVELOPMENT OF PLACENTA:-

 (i) Syncytio trophoblast

(ii) Cytotropho blast

(iii)Basement membrane

(iv) EEM

(v) Fetal Capillaries

(vi) Basement membrane 

STRUCTURE OF PLACANTA:-

2. PLATES IN PLACENTA  -:

(i) Chorionic plate 

(ii)Basal plate

(i)basal plate:- lies to the maternal aspect

(ii) chorionic plate:-

⦁ lies internally

⦁ umbilical card is attached to this plate

⦁ lined by amniotic membrane

between these lies intervillous space.

2 PLACENTAL SURFACE:-

(i) fetal surface

(ii) maternal surface

(I) FETAL SURFACE:-  

⦁ The origins 4/5 from fetal origins 

⦁ Smooth & covered by amnion 

⦁ Attach umbilical card fetal surface.

(II) MATERNAL SURFACE:-

⦁ origins 1/5 from maternal origins 

⦁ rough & spongy

⦁ formed by deciduas basal is (compact &spongy)

THE TERM PLACENTA:-

⦁ ALMOST A CIRCULAR DISK 

⦁ Diameter 15-20 CM (THICKNESS 2.5 CM & CENTRE 3 CM)

⦁ WEIGHT 500GM

⦁ PLACANTAL WEIGHT : FETUS WEIGHT  = 1:6                                        500: 3000

SPECIAL POINTS:-

NITABUCH  LAYER :-

⦁ 2ND LAYER (Basal Plate)

⦁ ITS MEAT TO TROHOBLAST FROM DECIDUA.

PLACENTA  ACCRETA  :- 

PLACENTA INCRETA    :-

PLACANTA PERCRETA  :-