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Figure 9. Medial Views of left membranous labyrinth human fetus 130 mm

Median View of the same model shown in figure 8. The oval impression on the proximal end of the scala tympani corresponds to the fenestra cochleae. As yet there is no communication at this point between the scala tympani and the subaraehnoid spaces corresponding to the aquaeductus cochleae. The spaces making up the cistern cover almost the whole of the utricle and saecule excepting the places at which the nerves enter and a small part of the medial surface near the attachment of the appendage.

At this time the periotic cistern has spread over the vestibular part of the membranous labyrinth, covering it nearly everywhere excepting at the macular portions where the nerves terminate. In figure 9 it can be seen that the mesial surface of the saccule is not covered; this lies closely against the wall of the cartilagenous vestibule. The uppermost division of the cistern situated between the crus commune and the ampulla of the posterior canal does not yet open into the general cavity. It has formed separately and owing to the position in which it lies its coalescence with the other parts of the cistern is retarded. Otherwise free communication exists between all divisions of the cistern.

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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)
Links: Streeter 1917 | Historic Embryology Papers | George Streeter


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 19) Embryology Streeter1917-fig09.jpg. Retrieved from

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G

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