. The American journal of anatomy. most decided lengthening accom-panied by more marked convolutions. A similar condition is not foundin the human embryo, nor to such marked extent in the mouse of thisstage. Microscopic sections demonstrate the capsular artery branching witha certain definite regularity on the surface of the gland, and sendingminute arteries into the substance of the testis. A thick section showsthese vessels entering perpendicularly and giving off branches whichform capillary anastomoses around the medullary cords. Clark, J. G.: The Origin, Development, and Degeneration of th
. The American journal of anatomy. most decided lengthening accom-panied by more marked convolutions. A similar condition is not foundin the human embryo, nor to such marked extent in the mouse of thisstage. Microscopic sections demonstrate the capsular artery branching witha certain definite regularity on the surface of the gland, and sendingminute arteries into the substance of the testis. A thick section showsthese vessels entering perpendicularly and giving off branches whichform capillary anastomoses around the medullary cords. Clark, J. G.: The Origin, Development, and Degeneration of the BloodVessels of the Human Ovary. Johns Hop. Hosp. Rept., Vol. IX. Eben C. Hill 449 When-the embryo has attained a length of eighty-seven mm. (Fig. 3)several of the anterior Wolffian arteries have disappeared and there isa decided atrophy of the organ itself. The capsular artery, a name whichmay be applied to that portion of the spermatic artery which suppliesthe albuginea and glandular substance proper, is .seen to give off many. Fig. 3. Cleared specimen of the right testis. Wolffian body and kidney ofan embryo pig 87 mm. long, showing descent of testis and atrophy of the an-terior Wolffian arteries. X 6. A., dorsal aorta; K., right kidney, length; S. A., spermatic artery; W. B., Wolffian body, mm. in length;W. D., Wolffian and Miillerian ducts; /. A., iliac artery; U. A., umbilicalartery. small branches, soine of which are growing over the surface of the organwhile others are penetrating deeply into the substance of the gland. Inseveral specimens of this and later stages the capsular artery is foundto divide into two main branches immediately after reaching the attachment of the sex gland to the Wolffian body is quite firm atthis time. 450 Development and Vascularization of the Testis Fig. 4 (128 mm.) shows a marked increase in the diameter of thespermatic artery, and also greater tortuosity of this vessel. The sexgland is seen to have assumed a diff
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