File:Anson1934 fig19.jpg: Difference between revisions

Fig. 19. 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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Links: fig 1-7 | fig 1 | fig 2 | fig 3 | fig 4 | fig 5 | fig 6 | fig 7 | fig 8-21 | fig 22-33 | 1934 Anson | Historic Papers | Inner Ear Development

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  fig 1 Human 22.8 mm

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  fig 2 Human 29 mm

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  fig 3 Human 34 mm

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  fig 4 Human 40 mm

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  fig 5 Infant 4 months

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  fig 6 Child 3 years

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  fig 7 embryo 36 mm

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  8 Cat 7 mm

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  9 Cat 10.6 mm

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  10 Cat 14 mm

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  11 Cat 15 mm

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  12 Cat 24.1 mm

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  13 Cat 32.6 mm

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  14 Cat 39 mm

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  15 Cat 39 mm

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  16 Cat 31 mm

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  17 Guinea-pig 18.5 mm

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  18 Dog 12.5 mm

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  19 Rabbit 21 mm

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  20 Rabbit 25 mm

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  21 Rabbit 29 mm

Reference

Anson BJ. The early development of the membranous labyrinth in mammalian embryos, with special reference to the endolymphatic duct and the utriculo—endolymphatic duct. (1934) Anat. Rec. 59: 15-25.

Cite this page: Hill, M.A. (2024, May 20) Embryology Anson1934 fig19.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Anson1934_fig19.jpg

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