Z8600021 at 15:24, 27 Ocak 2013

2013-01-27T15:24:12Z

← Older revision		Revision as of 02:24, 28 Ocak 2013
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	Fig. 28. No. 1535, 28 mm.		<gallery>
	Fig. 29. No. 2163, 36 mm.		File:Streeter1922-fig28.jpg\|Fig. 28. Embryo No. 1535, 28 mm.
	Fig. 30. No. 1980, 37 mm.		File:Streeter1922-fig29.jpg\|Fig. 29. Embryo No. 2163, 36 mm.
	Fig. 31. No. 1840a, 38.5 mm. (R.)		File:Streeter1922-fig30.jpg\|Fig. 30. Embryo No. 1980, 37 mm.
	Fig. 32. No. 2075, 40 mm. (R.)		File:Streeter1922-fig31.jpg\|Fig. 31. Embryo No. 1840a, 38.5 mm. (R.)
	Fig. 33. No. 2144, 45.5 mm. (R.)		File:Streeter1922-fig32.jpg\|Fig. 32. Embryo No. 2075, 40 mm. (R.)
	Fig. 34. No. 642, 49 mm.		File:Streeter1922-fig33.jpg\|Fig. 33. Embryo No. 2144, 45.5 mm. (R.)
	Fig. 35. No. 2170, 50 mm.		File:Streeter1922-fig34.jpg\|Fig. 34. Embryo No. 642, 49 mm.
	Fig. 36. No. 2095, 52 mm. (R.)		File:Streeter1922-fig35.jpg\|Fig. 35. Embryo No. 2170, 50 mm.
	Fig. 37. No. 2095, 52 mm.		File:Streeter1922-fig36.jpg\|Fig. 36. Embryo No. 2095, 52 mm. (R.)
	Fig. 38. No. 2066, 53 mm. (R.)		File:Streeter1922-fig37.jpg\|Fig. 37. Embryo No. 2095, 52 mm.
	Fig. 39. No. 2079, 56.5 mm.		File:Streeter1922-fig38.jpg\|Fig. 38. Embryo No. 2066, 53 mm. (R.)
	Fig. 40. No. 1561, 57 mm.		File:Streeter1922-fig39.jpg\|Fig. 39. Embryo No. 2079, 56.5 mm.
	Fig. 41. No. 218, 62.5 mm. (R.)		File:Streeter1922-fig40.jpg\|Fig. 40. Embryo No. 1561, 57 mm.
			File:Streeter1922-fig41.jpg\|Fig. 41. Embryo No. 218, 62.5 mm. (R.)
			</gallery>


	{{Streeter1922}}		{{Streeter1922}}

Z8600021: ==Plate 4. Photographs of the auricle of the human fetus during the third month== The photographs on plate 4 are specimens from the third month of intrauterine life. The first two (figs. 28 and 29) overlap the oldest stage shown on plate 3; most of the p

2013-01-27T15:09:22Z

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==Plate 4. Photographs of the auricle of the human fetus during the third month==

The photographs on plate 4 are specimens from the third month of intrauterine life. The first two (figs. 28 and 29) overlap the oldest stage shown on plate 3; most of the parts of the auricle can here be clearly recognized, although they are still very simple in form. Derived from the mandibular bar are the tragus and the crus helicis; as derived from the hyoid bar, one can recognize the anti tragus and the ridge-like primitive ear-fold or scapha-helix. The incisura intertragica, at the entrance of the concha, still bears a resemblance to the hyoid cleft from which it was derived. The concha does not acquire its concave, shell-like character until later in development, due to the relatively thick and swollen character of the surrounding parts. Figures 30 to 32 differ from the preceding ones only in the increasing prominence of the ear-fold. At this time there is very little surface evidence of the anthelix as distinct from the scapha-helix. However, if sections through this region are examined microscopically, it will be found that the cartilaginous auricle is already characteristically folded into a helix, scapha, anthelix, and concha, the free edge of the helix coming into close contact with the surface of the auricle.

All being taken at an enlargement of 10 diameters. In some cases the right ear was selected and reversed for convenience in comparison.

These are indicated by the letter R. All specimens are from the Carnegie Collection, and length given is crown-rump.

Fig. 28. No. 1535, 28 mm.
Fig. 29. No. 2163, 36 mm.
Fig. 30. No. 1980, 37 mm.
Fig. 31. No. 1840a, 38.5 mm. (R.)
Fig. 32. No. 2075, 40 mm. (R.)
Fig. 33. No. 2144, 45.5 mm. (R.)
Fig. 34. No. 642, 49 mm.
Fig. 35. No. 2170, 50 mm.
Fig. 36. No. 2095, 52 mm. (R.)
Fig. 37. No. 2095, 52 mm.
Fig. 38. No. 2066, 53 mm. (R.)
Fig. 39. No. 2079, 56.5 mm.
Fig. 40. No. 1561, 57 mm.
Fig. 41. No. 218, 62.5 mm. (R.)

{{Streeter1922}}

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[[Category:Human]] [[Category:Hearing]]

File:Streeter1922-fig28.jpg - Revision history

Z8600021 at 15:24, 27 Ocak 2013

Z8600021: ==Plate 4. Photographs of the auricle of the human fetus during the third month== The photographs on plate 4 are specimens from the third month of intrauterine life. The first two (figs. 28 and 29) overlap the oldest stage shown on plate 3; most of the p