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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 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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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


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 22) Embryology Anson1934 plate02.jpg. Retrieved from

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