File:Stage11 sem4.jpg: Difference between revisions

Revision as of 14:12, 22 April 2014

Human Embryo Carnegie stage 11

This is a ventral view of the Week 4 embryo head, showing the stomodeum (stomatodeum or stomatodaeum) region with the floor of this region occupied by the degenerating buccopharyngeal membrane. Loss of buccopharyngeal membrane opens the gastrointestinal and respiratory tract to amniotic fluid for the remainder of development. A bright field version of this image is also available.

Relative to the stomodeum:

Cranial (above) lies brain bulge covered in thin layer of surface ectoderm (surface crack is processing artefact).
Lateral (beside) lie the primordia of the first pharyngeal arch.
Inferior (below) lies the developing heart (lower left of image), ventral body wall removed to show heart tube.

Carnegie stage 11 25 days, 20 somite pairs

Stage 11 Facts: Week 4, 23 - 26 days, 2.5 - 4.5 mm, Somite Number 13 - 20. View: This is a scanning EM ventral view of the embryo head. Features: brain folds, heart, first pharyngeal arch, buccopharyngeal membrane

Stage 11 Links: bright field image | Detail - buccopharyngeal membrane

Image version links: Large 1000px | 800px | Medium 600px

Human Embryo (stage 11)
dorsolateral whole embryo
dorsal embryo
lateral embryo
lateral head
lateral head with overlay
embryo cross-section
embryo cross-section label
neural cross-section label
ventrolateral head
ventrolateral head with overlay
ventral head
buccopharyngeal membrane
neural crest
posterior neuropore
anterior neuropore

Image Source: Scanning electron micrographs of the Carnegie stages of the early human embryos are reproduced with the permission of Prof Kathy Sulik, from embryos collected by Dr. Vekemans and Tania Attié-Bitach. Images are for educational purposes only and cannot be reproduced electronically or in writing without permission.

Embryonic Development