. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. ent object {Vimler and mlclc of third ventriele M. B, mid-bi«in: C.», d *llt; Clfii. V, audilorr It, MRoad, etc., viiceru DpharrngMl mnre; Pg, M Indlcatiid: eh, noto- lind-limb. The aronion of fomatlo atalk SS. osidered, either in nent in the body n to throw light imc nr lered, hut it is of and pathological, ' a vertebrate the I derived from the after paoring for- THE DEVELO
. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. ent object {Vimler and mlclc of third ventriele M. B, mid-bi«in: C.», d *llt; Clfii. V, audilorr It, MRoad, etc., viiceru DpharrngMl mnre; Pg, M Indlcatiid: eh, noto- lind-limb. The aronion of fomatlo atalk SS. osidered, either in nent in the body n to throw light imc nr lered, hut it is of and pathological, ' a vertebrate the I derived from the after paoring for- THE DEVELOPMENT OF THE EMBRYO ITSELF. 109 ward, bends round to the dorsal side of the pharynx, each giving off at right angles to the yelk-sao a mteUine artery ; the aortie un'*<< dorsally, then again separate and become lost in the pos- ter, md of the embryo. The so-called arohea of the aorta are large branches in the anterior end of the embryo derived from the aorta itself. The venous system corresponding to the above is composed of anterior and posterior pairs of longitudinal (cardinal) veins, the former (jugular, cardinal) uniting with the posterior to form a common trunk (duc(tM Cuvieri) by which the venous blood is returned to the heart The blood from the posterior part of the yelk-sao is collected by the viteiline veins, which terminate in the median m'ntM venoaus. TlM Lator BtagM of th* Festal Oironlatioii.âCorresponding to the number of visceral arches Ave pairs of aortic arches arise; but they do not exist together, the first two having undergone more or less complete atrophy before the others appear. Figs. 115,116 convey an idea of how the permanent forms (indicated by darker shading) stand related to the entire system of vessels in different groups of animals. Thus, in birds the right (fourth) aortic aroh only remains in connection with the aorta, the left forming the subclavian artery, while the reverse occurs in mammals. The fifth arch (pulmonary) always su
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Keywords: ., bookauthormillswes, bookcentury1800, bookdecade1890, bookyear1890
