File:Wen1928-Fig06.jpg

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Fig. 6 A midsagittal projection reconstruction of the 22-somite embryo

H1093, showing most of the head. ‘ ?’ indicates the probable remains of the oral membrane.

In the 22-somite embryo, as in Davis’ 20-somite specimen, the closure of the anterior neuropore is completed, but its site on the external surface can still be recognized. The head ectoderm at that region is attached to the underlying brain wall in a small area probably representing the last point where the tissues separate (fig. 6).


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 30) Embryology Wen1928-Fig06.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Wen1928-Fig06.jpg

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