File:Mall1912-fig02.jpg

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).

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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, April 27) Embryology Mall1912-fig02.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Mall1912-fig02.jpg

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