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Fig. 20 to 23. Photomicrographs of sections from H951 (17 somites)

The levels arr indicated in figure 5. Zciss obj. C. X 100.

20 Section 28 passing through rhombomere 2 and the Vth crest.

21 Section 33 passing through the Vth neural crest and showing its relation to the arca V. The deeply staining mass of cells on the observer’s right (cr..neur.P 1) is continuous with the large mass of ‘Vth ganglion’ which adjoins the neural tube.

22 Section 35 at the level of the tip of the forebrain, the prcchordal plate and the caudal end of the Vth crest.

23 Section 57, showing the VII-VIII crest, the VII epibranchial placode (disc. VII) the thyroid anlage, and the ‘gill rudiment.’


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, June 25) Embryology Wen1928-Fig23.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Wen1928-Fig23.jpg

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