File:Wen1928-Fig02.jpg

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Fig 2 Photographs of the left 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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Reference

Wen IC. The anatomy of human embryos with seventeen to twenty-three pairs of somites (1928) J. Comp. Neural., 45: 301-376.


Cite this page: Hill, M.A. (2024, May 29) Embryology Wen1928-Fig02.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Wen1928-Fig02.jpg

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