This document outlines the stages of human embryonic development from fertilization through implantation and formation of the placenta and germ layers. It begins with fertilization of an egg by sperm to form a zygote, followed by cell division and formation of a morula and blastocyst. The blastocyst implants into the uterine wall and develops into an embryo as the germ layers form. The placenta and associated structures develop to facilitate nutrient exchange between the mother and developing embryo.

1. Indicate different parts.
Indicate unusual spotting.
0
hCG
Matured sperm Matured egg
FERTILIZATION Zygote Mitosis Formation of Morula
IMPLANTATIONBlastocyst Embryo
Formation of the germ
layers
Syncytiotrophoblast /
Chorionic villi
Placenta begins to form
Chorionic membrane
ETIOLOGY
 Matured sperm
 Matured egg
CONTRIBUTING FACTORS
 Lack of proper sex education
 Environment
 Normal reproductive organ
PREDISPOSING FACTORS
 Estrogen
 Pogesterone
Amniotic membrane
Vaginal spotting
Appears
EmbryoblastTrophoblast
Cytotrophoblast
A
 Estrogen
 Pogesterone
Connective tissue, Bones, Cartilage, Muscle, Ligaments, and Tendons.
Kidneys and Ureters. Reproductive System.
Heart,Lymph, and Circulatory Systems and Blood Cells.
Ectoderm
Mesoderm
Endoderm
CNS, PNS, Skin, Hair, Nails, and tooth enamel.
Sense Organ, Mucous membrane of the anus, mouth, and nose.
Mammary gland
Embryonic development
continues.
VIII. PATHOPHYSIOLOGY
Lining of Pericardial, Pleura,and Peritoneal Cavities.
Lining of the GI, Respiratory Tract, Tonsils, Parathyroid, Thyroid
and Thymus Glands. Bladder and Urethra.
Nausea and Vomiting
Umbilical veins
Umbilical artery
Cotyledon
Septa
Matured Placenta
32
 Estrogen
 Pogesterone

2. Indicate different parts.
Indicate unusual spotting.
Umbilical vein
Umbilical arteries
Cotyledon
Septa