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Fig 3 Photographs of the right side of a model of the head of the 17 somite embryo

Reduced in reproduction to 66% diameters. The ectodermal areas were projected from the model on which they had been plotted from measurements on the photomicrographs of the sections. The thickness of the ectoderm is indicated by the stippling, which is closer in the thicker parts. The coarse dots in area 17 pram. mark the location of cells emigrating from the placode; the spot marked * is illustrated in ﬁgure 11. The broken lines mark the areas over which deeply staining laminae of cells, probably of neural-crest origin, are closely applied to the overlying ectoderm. The visceral membranes are marked by parallel lines; sac.br.III indicates the position of the third pharyngeal pouch, which has not yet reached the ectoderm.

Abbreviations for all Figures
A.car.int., internal carotid artery A.seg.dor., dorsal segmental arteries A.urnb.d.-s., umbilical artery, right, left All., allantois Am., amnion An.ao., aortic anastomosis Ao.dor.d.-s., dorsal aorta, right, left Ar.ao.d.-s.,I, II, aortic arches, right, left, I, II Area br.III,IV, ectodermal areas of third or fourth visceral pouches Area hy., ectodermal area of hyoid arch Area P prin., principal trigeminal area (or the ectodermal area of placodal contributions) Area mand., mandibular area Area ophth, ophthalmic area Atr.d.s., atrium, right, left Atr.canal., atrial canal Br.int.d.-s., internal gill rudiment, right, left Bulb.ao., aortic bulb Bulb.cor., bulbus cordis Ch.dor., chorda dorsalis Ch.sp., chorda spinalis Coel., coelom Coel.epith., coelomic epithelium Coel.per., pericardial coelom Cor, site of heart Cr.neur.V, trigeminal neural crest Cr.neur.VII—VIII, acousticofacial neural crest Cr.neur.IX—X, glossopharyngeal vagal neural crest Dien., diencephalon Disc.inc., discus incepts Disc.V, trigeminal area where the ectoderm fused with the underlying tissue (neural crest?) Disc.VII, facial epibranchial placode Disc.IX, glossopharyngeal epibranchial placode Disc.X, vagal epibranchial placode Duct.proneph., pronephric duct, primary excretory duct Ect., ectoderm Endocard., endocardium Ent., entoderm Pos.pre-op., preoptic fossa Hep, primordium of liver (both medial and lateral thickening) Inf., infundibulum Int.caud., hindgut Int.atr.sul., interatrial sulcus Isth., isthmus	Memb.br.I, II, III, first, second or third branchial membranes. Memb.buc., buccopharyngeal membrane Memb.cl., cloacal membrane Meschy., mesenchyme Mesen, mesencephalon Myocard., myocardium Neph., nephrostome Neu.ant., anterior neuropore Ph., pharynx Pli.ph.vent.d.-s.1,2, ventral pharyngeal fold, right, left, first, or second Port.int.ant., anterior intestinal portal Pr.pul., primordium of lung Prec-h.pl., prechordal plate Prosen., prosencephalon Proc.mand., mandibular process Prom.cor., heart swelling (Davis) R.ao.d0r.1, 2, etc., first, second, etc., presegmental aortic branch R.ao.lat., lateral aortic branch R.ao.vent., ventral aortic branch Res.pre.op., preoptic recess (Johnston) Rh.1, .9, 3, 4, 5, 6, 7, rhombomere 1, 2, 3, 4, 5, 6, 7 S.1,2, etc., first, second, etc., somite S.ven., sinus vesous Sac.br.I, II, III, first, second, third pharyngeal pouch Sac.vit., yolk sac Sect, section Sept.tr., septum transversum Sul.di-mesen., dimesencephalic boundary Sul.la., laryngotracheal sulcus Sul.op., optic sulcus Tel., telencephalon Thy;., primordium of thyroid gland Tor.op., torus opticus (Froriep) Tub.proneph., pronephric tubule V.cap.prim., primitive head vein V.card.ant., anterior cardinal vein V.card.com., common cardinal vein Vent.cord., ventricle of heart Ves.mesoneph., mesonephric vesicle Ves.op., optic vesicle Ves.ot., otic vesicle Ves.proneph., pronephric vesicle

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