Leonardo on the Human Body (Dover Fine Art, History of Art) by Leonardo da Vinci
Author:Leonardo da Vinci [Vinci, Leonardo da]
Language: eng
Format: epub
Publisher: Dover Publications
Published: 2012-03-14T23:00:00+00:00
102 ventricles of the heart
The page was originally part of a single sheet, the other half being 107-8. The arguments presented here are consequently similar since they date from the same time.
fig 1. Sketch of the ventricles of the heart to show coronary vessels.
The accompanying note is self-explanatory. The three veins mentioned are probably the great, middle and small cardiac veins.
The heart has its surface divided into 3 parts by 3 veins descending from its base. Of these veins, two [great cardiac and small cardiac] delimit the boundaries of the right ventricle and have two arteries [right and left coronary] in contact beneath them. Of the 3rd vein [middle cardiac], I have not yet seen whether it has an accompanying artery, wherefore I am going to flay it to vouch for its presence. However, the surface interval of the heart enclosed between these arteries occupies half of the outer circular boundary of the heart and forms the external wall of the right ventricle, etc.
fig 2. Diagram to illustrate the area occupied by the right ventricle on the surface of the heart.
In this figure the base of the heart is represented by a rough circle a n b (or S) c, at the center of which is the apex d, so that the heart is being viewed from its apex. The letters n, and m, indicate the right and left coronary vessels with their interventricular branches delimiting the area on the surface occupied by their interventricular branches.
Let a n b c, be the circumference of the heart. The two veins and arteries which surround the lateral borders of the right ventricle are a S. The external wall of this ventricle will be a n S and the interval or area of the ventricle will be a n m S. d is the apex (cuspide) or point of the heart.
fig 3. Preliminary outline of a dissection of the right ventricle drawn in detail in fig. 4.
fig 4. The right ventricular cavity and tricuspid valve.
The lateral wall of the atrium has been resected so as to expose the tricuspid orifice from above. Below is the remaining portion of the auricle exhibiting the musculi pectinati. In the middle of the figure is a papillary muscle a b c, seen through the orifice. From it extend the radially disposed chordae tendinae f e d n m o p q r, passing to the cusp. At the base of the papillary muscle a moderator band is shown. The dissection is based upon the heart of an ox.
fig 5. The right ventricle and tricuspid valve.
We are informed that this is the right ventricle, and that A is united with A, which indicates that the heart was opened by means of a transverse incision and the two halves hinged back upon one another. The three papillary muscles and their chordae tendinae passing to the tricuspid valve are revealed, as well as the beginning of the infundibulum. Further notes read: If you inflate the auricles of the heart, you will see the shape of its cells.
Download
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.
Administration & Medicine Economics | Allied Health Professions |
Basic Sciences | Dentistry |
History | Medical Informatics |
Medicine | Nursing |
Pharmacology | Psychology |
Research | Veterinary Medicine |
Tuesdays with Morrie by Mitch Albom(4401)
Yoga Anatomy by Kaminoff Leslie(4100)
Science and Development of Muscle Hypertrophy by Brad Schoenfeld(3971)
Bodyweight Strength Training: 12 Weeks to Build Muscle and Burn Fat by Jay Cardiello(3779)
Introduction to Kinesiology by Shirl J. Hoffman(3626)
How Music Works by David Byrne(2964)
Sapiens and Homo Deus by Yuval Noah Harari(2843)
The Plant Paradox by Dr. Steven R. Gundry M.D(2425)
Insomniac City by Bill Hayes(2395)
Churchill by Paul Johnson(2362)
Coroner's Journal by Louis Cataldie(2358)
The Chimp Paradox by Peters Dr Steve(2224)
Hashimoto's Protocol by Izabella Wentz PharmD(2199)
The Universe Inside You by Brian Clegg(2048)
The Immune System Recovery Plan by Susan Blum(1965)
Don't Look Behind You by Lois Duncan(1915)
The Hot Zone by Richard Preston(1909)
Endure by Alex Hutchinson(1872)
Woman: An Intimate Geography by Natalie Angier(1841)
