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Fig. 16. Auditory Vesicle Model from Harvard Embryological Collection

Auditory vesicle and endolymphatic appendage in human embryos Figures 15 and 16, models prepared froiii a transverse series; figures 17, 18, and 19, from frontal series in the Harvard Embryological Collection. Figures 15 and 16, X 130; 17, 18, and 19, X 45.

  • 15 - 8 mm., 2066. The endolymphatic appendage has lengtliened, and is now pyramidal in outline. It no longer bears any remnant of the stalk by which the otocyst arose.
  • 16 - The same model viewed from the front. Note the demarcating crease at the arrow, and the atiscvice of a nodule on the endolymphatic appendage.
  • 17 - 12 mm., 816. Frontal series. Model, viewed froin behind; cut surface black. Compare the 8-mm. stage. At 12 mm., the appendage is not only considerably lengthened, but the two primary portions, the enlarged saccus and narrower ductus, are readily distiiiguisliablc from each other; these together are marked off sharply from the utricle by a crease (at the arrow) which constitutes the utricular fold or ‘valve.’
  • 18 and 19 - Models from the 29-mm. and tlie 40-mnn. human embryos (frontal series, 914 and 1917 respectively). In the model of the 40-mm. embryo the proximal two-thirds of the endolymphatic duct is omitted. Lateral views. The view distal projection of the endolymphatic sac is well defined; this appendage is a separate growth, and not a derivative of the original stalk of connection between the vesicle and the ectoderm.


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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)
Otic Vesicle Links: Fig. 1-8 | Plate 1 | 9 | 10 | 11 | 12 | 13 | 14 | Plate 2 | 15 | 16 | 17 | 18 | 19 | Anson 1934 | Harvard Collection | Inner Ear | Hearing

Reference

Anson BJ. and Black WT. The early relation of the auditory vesicle to the ectoderm in human embryos. (1934) Anat. Rec. 58: 127-137.


Cite this page: Hill, M.A. (2024, June 12) Embryology Anson1934 fig16.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Anson1934_fig16.jpg

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current15:37, 23 July 2015Thumbnail for version as of 15:37, 23 July 2015691 × 985 (47 KB)Z8600021 (talk | contribs)==Plate 2. Auditory Vesicle Models from Harvard Embryological Collection== Auditory vesicle and endolymphatic appendage in human embryos Figures 15 and 16, models prepared froiii a transverse series; figures 17, 18, and 19, from frontal series in the...

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