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Human Embryo Placental Blood Vessels

Small image of embryo (upper left) red line shows approximate level of transverse cross-section.

Small histology image (upper left) shows transverse section of embryo body. Black box indicates enlarged region from ventral body wall.

Histology image shows the placental vein and paired arteries lying inside the peritoneal cavity of the embryo ventral body wall. Shows cord vessels before the cord leaves the embryo at the umbilicus.

Note - the relative size of the vessels and the surrounding connective tissue; attachment to ventral body wall.

Historic Embryology - Placenta
1883 Embryonic Membranes \| 1907 Development Atlas \| 1909 \| 1910 Textbook \| 1917 Textbook \| 1921 Textbook \| 1921 Foetal Membranes \|1921 human \| 1921 Pig implantation \| 1922 Single placental artery \| 1923 Placenta Review \| 1939 umbilical cord \| 1943 human and monkey \| 1944 chorionic villus and decidua parietalis \| 1946 placenta ageing \| 1960 first trimester placenta \| 1960 monkey \| 1972 Placental circulation \| Historic Disclaimer

Selected Embryo Histology - Week 8 (Stage 22)
Selected Human Embryo Histology - Stage 22 (week 8) developing cortex labeled central nervous system and ventricles central nervous system and ventricles measured image nose and eyes eye optic nerve lens lens and pigmented epithelium lens and pigmented epithelium head region measured developing cochlea pituitary pituitary measured pituitary vertebra and spinal cord mesonephric ducts and bladder developing testis developing testis labeled developing testis developing testis labeled midgut herniation pelvic region - rectum and bladder pelvic region - rectum and bladder labeled pelvic region - rectum pelvic region - rectum labeled Aorta filled with red blood cells Lungs and thymus Dorsal aorta Placental blood vessels
Links: Carnegie stage 22 \| Week 8