From Embryology

Original file(610 × 853 pixels, file size: 110 KB, MIME type: image/jpeg)

Figure 8 and 9. Lateral Views of left membranous labyrinth human fetus 130 mm

Lateral view of a wax-plate reconstruction of the left membranous labyrinth and the periotic spaces in a human fetus, 130 mm. CR length (Carnegie Collection, No. 1018) enlarged 9 diameters. The cartilagenous stapes was removed from this model and the oval impression that it makes on the cistern can be plainly seen. The cistern has spread over the top of the utricle and along the lateral canal. The scala vestibuli extends to the tip of the cochlear duct where it communicates with the scala tympani, thus forming the helicotrema.

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.

Historic Disclaimer - information about historic embryology pages 
Mark Hill.jpg
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, February 22) Embryology Streeter1917-fig08.jpg. Retrieved from

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

File history

Click on a date/time to view the file as it appeared at that time.

current15:36, 17 September 2015Thumbnail for version as of 15:36, 17 September 2015610 × 853 (110 KB)Z8600021 (talk | contribs)
15:35, 17 September 2015Thumbnail for version as of 15:35, 17 September 20151,200 × 853 (218 KB)Z8600021 (talk | contribs)
15:35, 17 September 2015Thumbnail for version as of 15:35, 17 September 20151,200 × 1,391 (409 KB)Z8600021 (talk | contribs)