File:Anson1934 fig13.jpg

Fig. 13. Auditory Vesicle Model from Harvard Embryological Collection

Auditory vesicle in human embryos Figures 9 to 14. Models prepared from transverse series in the Harvard Embryological Collection. In figures 9, 10, and 11 an arbitrary patch of ectoderm, in the region of the auditory placode, is included in the model. The levels which represent the sections shown in the text figure are indicated by horizontal lines. X 130.

• 9 - 2.4-mm. embryo, H.E.C., 40. The cavity of the auditory pit is still in communication with the exterior through the hollow placodal stalk. See section 28, figure 1.
• 10 - 4 mm., 2302. The auditory vesicle has lengthened; the stalk of communi- cation between the epidermis and the vesicle, although still persistent, no longer contains a lumen. See section 12, figure 4.
• 11 - 6.3 mm., 2300. The initial indication of the constriction which is destined to separate the endolymphatic appendage from the vestibular portion of the vesicle is now apparent. The epidermis overlying the endolymphatic appendage is still thickened, but no remnant of the original placodal stalk of continuity remains. See section 67, figure 5.
• 12 - The same model, viewed from behind. The arrow points to the constricting crease between the developing endolymphatic appendage and the more pro- tuberant vestibule.
• 13 - 6.7 mm., 2285 (viewed from the front). The arrow indicates the deepen- ing crease which limits the endolymphatic appendage and marks the site of the future ‘valve.’
• 14 - The same model (viewed from the side). The endolymphatic appendage at this stage is readily distinguishable from the vestibular part of the auditory vesicle. The epidermis and the appendage carry tubercles which represent parts of the now discontjnuous placodal stalk (see section 71,fig. 6).

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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

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, April 19) Embryology Anson1934 fig13.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Anson1934_fig13.jpg

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