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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    derm (compare Figs. 20 and 24). The shrinkage of the yolk has had an effect on the shape of the future hepatic veins; the latter are now semilunar rather than crescentic in section. The ventral position of Fig. 25 position 0^ Fig. 24 Ventricle position of Fig. 23 Otocyst Branchial cleft 3 Branchial cleft 2''. Ventral aorta Branchial a. 3^ Conus Dorsal parietal pericardium/ Atrium Anterior wall of sinus venosus Ectoderm Left jugular vein L. cardinal v. CEsophagus Posterior wall of sinus venosus ij^Arrow in L. hepatic vein (head of arrow rests on yolk) Left wall of L. hepatic vein Parietal peritoneum [cut] Ectoderm Ventral parietal pericardium (mostly removed) Fig. 22.—The left side of a reconstructiou from the posterior gill region of shad, stage of KJG hours. X 100 diams. Suflicient body-wall lias been removed to open the pericardial coelom laterally and venti’ally and the peritoneal coelom laterally. The anterior pole of the yolk is intact, the ventricle and atrium have been opened. The vein imme- diately ventral to the left jugular is the left inferior jugular. part of the pericardial ccelom has extended backward, so that the endocardium linins; the anterior wall of the sinus venosus assists in the formation of the hepatic veins (see Fig. 24). The expansion