Body-stalk

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Body-stalk

Diagram showing the expansion of amnion and delimitation of the umbilical cord

Section through the embryo
Latin	Pedunculus truncalis
Gray's	p.53

The body-stalk is a band of mesoderm that first connect the caudal end of the embryo to the chorion With the formation of the caudal fold the body-stalk assumes a ventral position; a diverticulum of the yolk-sac extends into the tail fold and is termed the hind-gut.

The function of the body-stalk is later replaced by the umbilical cord.

Additional images

Human embryo—length, 2 mm. Dorsal view, with the amnion laid open. X 30.
Human embryo of 2.6 mm.
Diagram showing later stage of allantoic development with commencing constriction of the yolk-sac.
Model of human embryo 1.3 mm. long.
Section through ovum imbedded in the uterine decidua.
Embryo between eighteen and twenty-one days.
Human embryo about fifteen days old. Brain and heart represented from right side. Digestive tube and yolk sac in median section.

External links

Swiss embryology (from UL, UB, and UF) hdisqueembry/triderm0

Developmental biology > Human embryogenesis (development of embryo) and development of fetus (TE E2.0)

First three
weeks

Week 1

Week 2
(Bilaminar)

Week 3
(Trilaminar)

Germ layers	Archenteron/Primitive streak Primitive pit Primitive knot/Blastopore Primitive groove Gastrula/Gastrulation Regional specification Embryonic disc

Ectoderm	Surface ectoderm Neuroectoderm Somatopleuric mesenchyme Neurulation Neural crest

Endoderm	Splanchnopleuric mesenchyme

Mesoderm	Chorda- Paraxial (Somite/Somitomere) Intermediate Lateral plate Intraembryonic coelom Splanchnopleuric mesenchyme/Somatopleuric mesenchyme

M: OBS

phys/devp/memb

mthr/fetu/infc, epon

proc, drug (2A/G2C)

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