File:Streeter1922-fig52.jpg

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Fig. 52. Embryo No. 9526, 114 mm CRL

Figures 51 and 52 represent flattened types of auricles, such as that depicted in figure 46 (plate 5). One might think that this was due to flattening of the ear by handling of the specimen, but such is not the case; the specimens were in good condition and had not been subjected to any mechanical damage. In my opinion they can be interpreted only as early exhibitions of a poorly marked helix so commonly seen in the adult. Both of these specimens show a tendency toward a double tragus. In one the larger segment is above and in the other below.

Plate 6. Photographs showing the form of the human auricle during the fifth month of intrauterine life

The photographs shown on plate 6 are taken from specimens in the fifth month of development, with the exception of the last, which has a menstrual age of 23 weeks. Figures 51 and 52 represent flattened types of auricles, such as that depicted in figure 46 (plate 5). One might think that this was due to flattening of the ear by handling of the specimen, but such is not the case; the specimens were in good condition and had not been subjected to any mechanical damage. In my opinion they can be interpreted only as early exhibitions of a poorly marked helix so commonly seen in the adult. Both of these specimens show a tendency toward a double tragus. In one the larger segment is above and in the other below. The specimen shown in figure 53 is similar to the type shown in figure 49 and is characterized by a marked development of the transverse ridges across the anthelix.


With the exception of specimen shown in figure 59, which has a menstrual age of 23 weeks.

The photographs are all shown at an enlargement of 4 diameters. Specimens are from the Carnegie Collection, and length given is crown-rump.


In-text Figures: Figure 1 and 2 | Figure 3 and 4 | Figure 5 | Figure 6 and 7 | Figure 8 | Text | Glossary
Plates: Plate 1 | Plate 2 | Plate 3 | Plate 4 | Plate 5 | Plate 6 | Plates | Glossary
Figures: 1. Auricle cartilage | 2. External ear | 3. Agnathia | 4. Agnathia+cyclopia | 6. Auricular cartilage embryo 21, 32 and 43 mm | 7. Auricular cartilage 50 mm fetus | 9. Embryo 6 mm | 10. Embryo 12 mm | 11. Embryo 14 mm | 12. Embryo 18 mm | 13. Embryo 1380, 5 mm | 14. Embryo 1767, 11 mm | 15. Embryo 1461, 10 mm | 16. Embryo 562, 13 mm | 17. Embryo 1232, 14 mm | 18. Embryo 475, 15 mm | 19. Embryo 899, 13 mm | 20. Embryo 434, 15 mm | 21. Embryo 492, 16.8 mm | 22. Embryo 576, 17 mm | 23. Embryo 547, 18 mm | 24. Embryo 955, 17 mm | 25. Embryo 1584, 18 mm | 26. Embryo 1134e, 21.3 mm | 27. Embryo 1358b, 33.2 mm | 28. Embryo 1535, 28 mm | 29. Embryo 2163, 36 mm | 30. Embryo 1980, 37 mm | 31. Embryo 1840a, 38.5 mm | 32. Embryo 2075, 40 mm | 33. Embryo 2144, 45.5 mm | 34. Embryo 642, 49 mm | 35. Embryo 2170, 50 mm | 36. Embryo 2095, 52 mm | 37. Embryo 2095, 52 mm | 38. Embryo 2066, 53 mm | 39. Embryo 2079, 56.5 mm. | 40. Embryo 1561, 57 mm | 41. Embryo 218, 62.5 mm. (R.) | 42. Embryo 1724, 66.2 mm | 43. Embryo 2328, 65 mm | 44. Embryo 2118, 69 mm | 45. Embryo 981, 85 mm | 46. Embryo 1845, 87 mm | 47. Embryo 1449, 87.3 mm | 48. Embryo 2003, 103.5 mm | 49. Embryo 1858, 100 mm | 50. Embryo 2274, 113 mm | 51. Embryo 2185, 113.5 mm. | 52. Embryo 9526, 114 mm. | 53. Embryo 1811, 114 mm | 54. Embryo 1716, 119 mm. Fig. 59. 1742, 191.2 mm | 55. Embryo 19576, 119 mm. | 56. Embryo 1782, 135.6 mm | 57. Embryo 1702, 150 mm | 58. Embryo 1708, 154 mm | 59. Embryo 1742, 191.2 mm | Figures


Related Notes: Outer Ear Development | Carnegie Contributions to Embryology

Reference

Streeter GL. Development of the auricle in the human embryo. (1922) Carnegie Instn. Wash. Publ. 277, Contrib. Embryol., 14: 111-138.



Cite this page: Hill, M.A. (2024, April 15) Embryology Streeter1922-fig52.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Streeter1922-fig52.jpg

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current08:27, 28 January 2013Thumbnail for version as of 08:27, 28 January 2013586 × 774 (83 KB)Z8600021 (talk | contribs) ==Plate 6. Photographs showing the form of the human auricle during the fifth month of intrauterine life== The photographs shown on plate 6 are taken from specimens in the fifth month of development, with the exception of the last, which has a menstrual