The development of the heart in shad (Alosa sapadissima, Wilson) : with a note on the classification of teleostean embryos from a morphological standpoint / by H.D. Senior.

  • Senior, H.D.
Date:
1909
Catalogue details

Licence: In copyright

Credit: The development of the heart in shad (Alosa sapadissima, Wilson) : with a note on the classification of teleostean embryos from a morphological standpoint / by H.D. Senior. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    THE DEVELOPMENT OF SHAD (Alosa Sapadissima, WusdnJT With a Note on the Classification of Teleostean Embryos FROM A Morphological Standpoint. BY II. D. SENIOR. (From The Wistar Institute of Anatomy and Biology, Philadelphia, and the Department of Anatomy in the College of Medicine, Syracuse University). With 27 Figures. CONTENTS. PAGE. Introduction—A brief description of the heart and great venous chan- nels of a recently hatched shad 212 Contrast drawn between embryos of the shad type and those in which a vitelline vessel-network occurs. Suggested classifica- tion of teleostean embryos into morphological types depending on the relation of the ventral vessel system to the yolk 215 Statement of the object in investigating the development of the heart in shad, and of the scope of this investigation 219 Material and Methods 219 Development of the Heart 222 Period 1. Formation of the heart anlage 222 Review of the evidence bearing on the relation of the endo- cardium to the vascular endothelium of the head in gen- eral 232 Period 2. Lasting untii rhythmical contraction begins in the par- * tially formed heart-tube 237 Period 3. In which the heart-tube is completed, to form conus, ventricle, and atrium; and assumes the adult position. Stage of G.2 mm 249 Correlation of the stages estimated by the number of somites with those designated by the length of the embryo 244 Mechanism of the circulation in different stages of develop- ment 244 Stage of G.2 mm 24G Stage of 7.3 mm 249 Stage of 8.75 mm., and a comparison of the heart with that of the stage described in the introduction 250 Period 4. Formation of the sinus venosus and hepatic vein 252