The document summarizes the normal process of a spontaneous vaginal delivery for a 27 year old female in her first pregnancy. It describes fertilization and the development of the zygote and morula. It explains that the morula enters the uterus on day 3 and separates into trophoblast and embryoblast layers by day 4, with the trophoblast implanting into the endometrium on day 6 to begin the embryonic development stages through week 8. Fetal development then continues from week 9 until birth, when the newborn is delivered vaginally.

1. PATHOPHYSIOLOGY (Normal Spontaneous Vaginal Delivery)
HOST AGENT ENVIRONMENT
Female Therapeutic Environment
27 years old Fertilization
G1P1001 ( Union of sperm and ovum )
Zygote - Unicellular
( Intermingling of haploid paternal 23 X or Y and maternal 23 X chromosomes )
Series of Mitotic Cell division - Cleavage
( In 24 hours become two cell organism )
In 72 hours become 16 cell organism called Morula
Morula enters the uterus on the 3rd
day through peristaltic movement
Separate into two parts by fluid from the uterus on the 4th
day
The outer layer gave rise to the placenta The inner layer gave rise to the embryo
( trophoblast ) ( embryoblast )
blastocytes ataches to endometrium on the 6th
day
Implantation
Embryonic development begins during second week continues through

2. the eighth week
3 Stages
• 1st
stage – increase in cell number and with Fetal Development is from ninth week to birth
elaboration of cell products
• 2nd
stage – morphogenesis / includes mass cell Newborn baby via Vaginal Delivery
movement
• 3rd
stage – differentiation or maturation of
physiologic processes