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Copyright © 1995 to the
"Frontiers in Bioscience"

DAY

STAGE ACTION

CARNEGIE STAGE

ORIENTATION

IMAGE

LENGHT (mm)

26

27-Somite.
Three pairs of branchial (pharyngeal) arches.
Mandibular prominence of the first arch form the caudal boundary.

12

Cranial

Caudal

Lateral view

3,0-5,0

Embryo, lateral view, 27-somite embryo, Carnegie stage 12, ~day26

Curvatrue of embryo
Three pairs of branchial (pharyngeal) arches
Mandibular prominence of the first arch primordium of the lower jaw)
Lens placode (primordium of the lens)
Otic pit
Closure of rostral neuropore