Carpenter's principles of human physiology (1881) (14595065039)

Identifier: carpentersprinci00carp (find matches)
Title: Carpenter's principles of human physiology
Year: 1881 (1880s)
Authors: Carpenter, William Benjamin, 1813-1885 Meneses, Henry Power
Subjects: Human physiology Physiology
Publisher: London : J. & A. Churchill
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School



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some degree by the time that it arrives at the Heart. In theright auricle, which it then enters, it would be also mixed with the venousblood brought thither by the descending Cava; were in not that a verycurious provision exists to prevent (in great degree, if not entirely) any suchfurther dilution. The Eustachian valve, which is situated at the lowermargin of the vena cava inferior at the point where it opens into the right * See the elaborate Memoirs Od the Development of the Great Anterior Veins of Manand Mammalia ( Phil. Trans., 1850), by Mr. J. Marshall; who has further shown thatsome vestiges of the original arrangement may be traced even in the normal condition of thevenous system in the adult. t It does not seem probable that the depurating action of the Liver can be energeticallyperformed during foetal life; and its large dimensions and copious supply of blood appearrather to be referable to its function as a blood-making gland. 3 o 930 OF GENERATION : EMBRYONIC DEVELOPMENT.
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■I\2Q/ auricle, has been found, by theexperiments of Dr. J. Reid,*to serve the purpose of direct-ing the arterial blood, whichflows upwards from the ascend-ing Cava, through the foramenovale, into the left auricle,whence it passes into the leftventricle ; whilst it also directsthe venous blood, that has beenreturned by the descendingCava, into the right ventricle.When the ventricles contract,the arterial blood which theleft contains is propelled intothe ascending Aorta, and sup-plies the branches that proceedto the head and upper extre-mities, before it undergoes anyadmixture ; whilst of the venousblood contained in the rightventricle, part is transmittedby the Pulmonary artery tothe lungs, but another (andprobably by far the larger)part finds its way through theDuctus Arteriosus or DuctusBotalli into the descendingAorta, mingling with thearterial current which thatvessel previously conveyed, andpassing thus to the trunk andlower extremities. Hence thehead and superior extremities,w