. The American journal of anatomy. Fig. 6. Submaxillary gland of pigs embryo 12 centimeters long. Same methodof preparation as Fig. .5. x 10 diameters. In this specimen only the arteriesaccompanying the ducts and the terminal alveolar plexus are visible. over the summit of the alveoli and are collected into venules whichreturn to the point of junction of the ducts and alveoli, and there uniteinto little terminal veins that accompany the ultimate arterioles. x\tthis period an occasional branch from one of the terminal arteriespasses out from between the buds and joins the small plexus that isbe
. The American journal of anatomy. Fig. 6. Submaxillary gland of pigs embryo 12 centimeters long. Same methodof preparation as Fig. .5. x 10 diameters. In this specimen only the arteriesaccompanying the ducts and the terminal alveolar plexus are visible. over the summit of the alveoli and are collected into venules whichreturn to the point of junction of the ducts and alveoli, and there uniteinto little terminal veins that accompany the ultimate arterioles. x\tthis period an occasional branch from one of the terminal arteriespasses out from between the buds and joins the small plexus that isbeing formed on the capsule of the gland. As yet septal arteries arenot found. Fig. G shows an injected silver preparation of a pig atthis stage. Except in certain points the mass has not passed over intothe veins, for the most part leaving the arteries and capillary plexusaround the alveoli the single visible portion of the vascular system. Thegreater regularity of the alveolar plexus is now clearly shown. Joseph Marshall Flint 431. Fig. 7. Submaxillarj- gland of pigs embryo 18centimeters long. Same method of preparationand magnification as Fig. 5. The arteries andvenae comites are distinctly seen. These mayfollow as far as the terminal arterioles whichare now forming those of the lobular capillary clusters with their arteriolesand venules represent the secondary or ulti-mate lobules. The plexus about the ducts isnot injected. In a pig 18 ccntiniotors long the main submaxillary vessels and submaxillary duct are now some-what separated. Arteries andveins are distineth^ seen in theplexus embracing the ductussubmaxillaris. These are de-rived from its vasa comites. Theramification has not increasedso much in number of orders asin the number of branches. Thearteries still preserve their in-dividualit}^ but a duplication ofveins is observed as ducts in-crease in size. Here and thereone finds not infrequently avein looping around the arteriesand even embracing the
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectanatomy, bookyear1901
