Embryology Review Flashcards
2 weeks
Hgb Production
3 weeks
“Heart” Beat
Liver bud present
Mesentery is forming
3 to 4 weeks
Blood Cells Appear
Circulation is established
Primary neurulation
4 weeks
Intestine is present
Esophagus & stomach become distinct
4 to 5 weeks
Intraventricular Septum Begins to Form
5 weeks
Fusion of the endocardial Cushions
6 weeks
Midgut Into Umbilical Cord
Urinary Bladder Develops
6 to 7 weeks
Gonads Develop
Closure of Ventricular Septum
Formation of Coronary Arteries
7 weeks
Anal Canal Formed & Testosterone Released
Midgut Into Umbilical Cord
Urorectum Septum Fuses with Cloacal Membrane-separting rectum from developing urinary bladder
7 to 12 weeks
Maturation of Specific Immune Response
8 weeks
CV System Complete
& Nephrogenesis Begins
9 weeks
External Genitalia Form
10 weeks
Insulin Secretion Starts
Intestines reenter abdominal cavity and continue counterclockwise rotation around the axis of the superior mesenteric artery
9 to 10 weeks
Urine production & Glomerular Filtration
11 weeks
Thyroid Gland - TH synthesis
12 weeks
Able to see External Genitalia on Maternal Vaginal U/S Antigen recognition is demonstratable
Muscular layers of intestine are present
Active transport of amino acids begins
Pancreatic islet cells appear, bile appears
12 to 13 weeks
Formation of the urethra complete
13 weeks
Graft vs. Host reactivity is present
14 to 15 weeks
Vascular pattern of kidney resembles that of the adult kidney
16 weeks
Meconium is present
Swallowing is observed
16 to 20 weeks
Chordee Occurs in the penis
17 Weeks
Serum IgM levels can be detected
24 weeks
Ganglion cells are detected in the rectum
26 weeks
Random Peristalsis Begins
34 to 36 weeks
Sucking & swallowing become coordinated
36 to 38 weeks
Maturity of the GI system completed
5 to 40 weeks
Intestine elongates approximately 100 fold
35 weeks to years postnatal
Organization of neural function
24 weeks to adult
Myelination of nerves
24 weeks to term
Proencephalic Development
