NP: The amniotic cavity is sealed off with now three cavities - amniotic, exocoelom and ectoplacental cleft. The neural plate is defined anteriorly and the head process is developing. In the midline, sub-adjacent to the neural groove, the notochodal plate is visible.

LNP: The allantoic bud elongates.

EHF: The rostral of the neural plate begins to enlarge to form the head folds.

LHF: Head folds continue to enlarge and the foregut pocket begins to form.

7.5 dpc (range(7.25-8)  
Downs & Davies  OB-EB/LB-EHF-LHF: - no All. bud to late All. bud to early head fold to late head fold 
Witschi Stage 12 -13 (rat) 
Carnegie Stage 9 (human - stage table)

Scale bar in microns.