File:Streeter1917-fig06-07.jpg

Fig. 6 Lateral View of reconstruction of the left membranous labyrinth and the periotic spaces in a human fetus 85 mm. CR length (Carnegie Collection, No. 1400-30) enlarged 9 diameters. Although the greater part of the cistern abuts against the stapes it will be noted that it also is beginning to spread over the dorsal surface of the utricle and along the inner border of the lateral canal. The scala vestibuli communicates freely with the cistern and extends downward along the apical surface of the cochlear duct throughout nearly two turns, show- ing the characteristic sacciilatcd appearance near its tip where the coalescence of the spaces is less complete.

Fig. 7 Median view of same model shown in figure 6. The oval indentation in the proximal end of the scala tympani corresponds to the fenestra cochleae. This space extends along the cochlear duct about the same distance as the scala vestibuli; the two however do not communicate with each other as yet. The peripheral border of the scala tympani is characterized by sacculations cor- responding to spaces that are coalescing with the main space. This indicates the direction of the growth of the" scala at this time.

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Reference

Streeter GL. The development of the scala tympani, scala vestibuli and perioticular cistern in the human embryo. (1917) Amer. J Anat. 21: 300-320.

Cite this page: Hill, M.A. (2024, April 25) Embryology Streeter1917-fig06-07.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Streeter1917-fig06-07.jpg

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