Fig. 5
From: Diminution of pharyngeal segmentation and the evolution of the amniotes
Pharyngeal pouch morphology in mouse and human embryos. a Confocal section through the pharyngeal region, at the segmental phase, of a TS17 (E10.5) mouse embryo. Neural crest (Wnt1::cre+) structures are labelled with membrane GFP, while non-neural crest tissues express membrane RFP. It is noticeable that the fourth pouch, highlighted by an arrow, does not contact the ectoderm. b HREM section through the pharyngeal region, at the segmental phase, of a CS15 human embryo. The fourth pouch, highlighted by an arrow, does contact the ectoderm. Scale bar = 0.25 mm