File:Mall1912-fig02.jpg

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Fig. 2. From the reconstruction of a heart of an embryo 3.5 mm long

Embryo (No. 164). X 66. View from the left side.

In the embryo 3.5 mm. long (No. 164) the completed heart tube is seen, which is S-shaped and twisted upon itself so that the arterial and venous ends are brought close together. At the venous end the muscle wall is slightly dilated which marks the atrium; this is lined closely with endothelium which encircles the cavity within. No delicate fibrils are here seen between the muscle wall and its endothelial lining. Then follows an upper bend to the heart after which there is a dilatation projecting towards the left side, the former marking the atrial: canal and the latter the left ventricle. The lower connecting piece unites the left ventricle with the bulb which later on gives rise to the right ventricle. In the atrial canal (Haller’s auricular canal) the endothclial tube is seen as a solid strand of cells suspended freely in the muscle wall by the delicate fibrils already mentioned. In the left ventricle the tube shows a distinct cavity, while throughout the rest of the heart tube the cavity is irregular but not pronounced. The form of the endothelial tube is shown in fig. 2 and again in a semi-diagrammatic figure of a transverse section through the atrium, ventricle and bulb in fig. 3. The delicate fibrils, which no doubt belong to the endothelial cells are present in large number throughout the whole heart tube, excepting in that which forms the atrium. In another embryo (No. 384, 2 mm. long), considerably smaller than the one just described and probably pathological, the degree of development of the heart is practically identical with the one 3.5 mm. long (No. 164).


Mall Figure Legend 
  • A - atrium
  • A.C. - atrial canal
  • A.Cu. - anterior endocardial cushion
  • A.F. - annulus fibrosus
  • A.O. - aorta
  • A.P. - anterior papillary muscle
  • B.S. - bulbo-spiral band
  • A.V.B. - atria-ventricular bundle
  • B. - bulb
  • C.S. - coronary sinus
  • I.V.C. - interventricular canal
  • F.O.1 - foramen ovale I
  • F.O.2 - foramen ovale II
  • L.A. - left atrium
  • L.Cu. - left endocardial cushion
  • L.0. - left venous ostium
  • L.P. - large papillary muscle of the right ventricle
  • L.R.V. - longitudinal bundle of the right; ventricle
  • L.V. - left. ventricle
  • M.p.m. - medial papillary muscle
  • P. - pulmonary artery
  • P.Cu. - posterior endocardial cushion
  • P.P. - posterior papillary muscle
  • R.A. - right atrium
  • R.Cu. - right endocardial cushion
  • R.O - right venous ostium
  • R.V. - right ventricle
  • S.A. - septum of the atria
  • S.S. - sino-spiral band
  • S.V. - septum of the ventricle
  • V. - ventricle
Historic Disclaimer - information about historic embryology pages 
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Pages where the terms "Historic" (textbooks, papers, people, recommendations) appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms, interpretations and recommendations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)
Links: Fig 1 | Fig 2 | Fig 3 | Fig 4 | Fig 5 | Fig 6 | Fig 7 | Fig 8 | Fig 9 | Fig 10 | Fig 11 | Fig 12 | Fig 13 | Fig 14 | Fig 15 | Fig 16 | Fig 17 | Fig 18 | Fig 19 | Fig 20 | Fig 21 | Fig 22 | Fig 23 | Fig 24-25 | Fig 26 | Fig 27 | Fig 28 | Fig 31-33 | Mall 1912 | Historic Papers | Carnegie Collection | Franklin Mall | Cardiovascular Development
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This paper by Franklin Mall uses his human embryo collection that will eventually form the beginning of the Carnegie Collection.
Franklin Mall Links: Franklin Mall | 1891 26 Day Human Embryo | 1905 Blood-Vessels of the Brain | 1906 Human Ossification | 1910 Manual of Human Embryology 1 | 1912 Manual of Human Embryology 2 | 1911 Mall Human Embryo Collection | 1912 Heart Development | 1915 Tubal Pregnancy | 1916 Human Magma in Normal and Pathological Development | 1917 Frequency Human Abnormalities | 1917 Human Embryo Cyclopia | 1918 Embryo Age | 1918 Appreciation | 1934 Franklin Mall biography PDF | Mall photograph | Mall painting | Mall painting | Carnegie Stages | Carnegie Embryos | Carnegie Collection | Category:Franklin Mall
Cardiovascular Links: cardiovascular | Heart Tutorial | Lecture - Early Vascular | Lecture - Heart | Movies | 2016 Cardiac Review | heart | coronary circulation | heart valve | heart rate | Circulation | blood | blood vessel | blood vessel histology | heart histology | Lymphatic | ductus venosus | spleen | Stage 22 | cardiovascular abnormalities | OMIM | 2012 ECHO Meeting | Category:Cardiovascular
Historic Embryology - Cardiovascular 
1902 Vena cava inferior | 1905 Brain Blood Vessels | 1909 Cervical Veins | 1909 Dorsal aorta and umbilical veins | 1912 Heart | 1912 Human Heart | 1914 Earliest Blood-Vessels | 1915 Congenital Cardiac Disease | 1915 Dura Venous Sinuses | 1916 Blood cell origin | 1916 Pars Membranacea Septi | 1919 Lower Limb Arteries | 1921 Human Brain Vascular | 1921 Spleen | 1922 Aortic-Arch System | 1922 Pig Forelimb Arteries | 1922 Chicken Pulmonary | 1923 Head Subcutaneous Plexus | 1923 Ductus Venosus | 1925 Venous Development | 1927 Stage 11 Heart | 1928 Heart Blood Flow | 1935 Aorta | 1935 Venous valves | 1938 Pars Membranacea Septi | 1938 Foramen Ovale | 1939 Atrio-Ventricular Valves | 1940 Vena cava inferior | 1940 Early Hematopoiesis | 1941 Blood Formation | 1942 Truncus and Conus Partitioning | Ziegler Heart Models | 1951 Heart Movie | 1954 Week 9 Heart | 1957 Cranial venous system | 1959 Brain Arterial Anastomoses | Historic Embryology Papers | 2012 ECHO Meeting | 2016 Cardiac Review | Historic Disclaimer

Some of the numbered embryo used in this paper:

  • Embryo 391 - 8 somites - Stage 10
  • Embryo 470 - 17 somites - Stage 11

Reference

Mall FP. On the development of the human heart. (1912) Amer. J Anat. 13: 249-298.


Cite this page: Hill, M.A. (2024, May 24) Embryology Mall1912-fig02.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Mall1912-fig02.jpg

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G

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