File:Journal of morphology (1909) (14750681366).jpg

Identifier: journalofmorphol20wist (find matches)
Title: Journal of morphology
Year: 1909 (1900s)
Authors: Wistar Institute of Anatomy and Biology
Subjects: Morphology Physiology
Publisher: Boston : Ginn & Co.
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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nd pseudoblastodermicnuclei are here well illustrated, a, invagination which will give rise tostomodeum. x 60. Fig. 34. Transverse section through posterior depression in ventral groove,Fig. 32 (Stage F). a, flask-shaped depression in ventral groove, x 105. Fig. 35. Transverse section near the end of the tail-fold of an embryo ofLeptinotarsa similar to Stage H, position 35. The pole-cells are creeping fromthe posterior amniotic cavity through the pole-cell canal, x 140. Fig. 36. Sagittal section through the posterior end of an egg of Leptinotarsalike Stage H, position 36. One pole-cell is part way through the pole-cellcanal, x 105. Fig. 37. Sagittal section through the tail-fold of an embryo in Stage J,position 37. Mesoderm has appeared. A few pseudoblastodermic nuclei showsigns of disintegration, x 105. Fig. 38. Transverse section of tail-fold of embryo in Stage J, (38), showingpassage of pole-cells through pole-cell canal, a, flask-shaped depression inventral groove, x 105. PLATE HI
Text Appearing After Image:
R. W HEGNER, DEL EXPLANATION OF TLATE lY. Figs. 39 to 45. Sagittal sections tlirougli the tail-fold or posterior end ofembryos, showing the migration of the germ-cells within the body, and theircrowding together to form the germ-glands. Figs. 39 and 42, x 1^5; theothers, x 140. Fig. 39. Embryo to Stage K (39). Almost all of the pole-cells have pene-trated into the embryo. Fig. 40. Embryo in Stage L (40). a, two pole-cells lying in the muchshortened pole-cell canal. Fig. 41. Embryo in Stage M (41). The germ-cells are closer together thanin a younger embryo (Fig. 40). Fig. 42. Embryo in Stage N (42). The germ-cells form a distinct germ-gland with epithelium of mesoderm-cells. Fig. 43. Embryo in Stage O (43). One of the germ-glands lies at the sideof the median line near ventral surface of embryo. Fig. 44. Embryo of 86 hours slightly older than Stage O. Germ-gland hasbeen carried near dorsal surface by lateral growth of embryo around the yolk. Fig. 45. Embryo of 105 hours (male). The ger

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