File:Streeter1906 fig04.jpg

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Fig.4. Diagram representing the growth and stages of differentiation of the human membranous labyrinth

A resume of the development of the labyrinth is presented in the form of a diagram in the adjacent Fig. 4, which illustrates the successive steps by which the simple ear vesicle enlarges and becomes differentiated into the group of connected individual compartments which characterize the adult ear.

3.5 weeks 4 weeks 5 weeks 6 weeks 10 weeks
(6-7 mm) the ear vesicle consists of two simple pouches, into the upper of which opens the endolymphatic appendage. (9 mm) there is at the base of the vestibular pouch an atrium, the space destined to form the utricle and saccule. (12 mm) this space is circumscribed from the cochlear pouch below by a constriction corresponding to the ductus reuniens, and above from the rest of the vestibular pouch by the formation of the semicircular canals. (20 mm) an ingrowth of the wall of the atrium divides it into an upper part (utricle) and lower part (saccule). (30 mm) this partition between the utricle and saccule is complete and extends inward in such a way as to split the orifice of the endolymphatic duct.



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Pages where the terms "Historic Textbook" and "Historic Embryology" 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 and interpretations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)
Mall 1906 Links: Fig 1. 14mm Embryo | Fig 2. 30mm Embryo | Fig 3. Semicircular canal | Fig 4. Membranous Labyrinth | Fig 5. Acoustic nerve complex | Fig 6. Facial-acoustic Complex | Fig 7. Facial Nerve Pig Embryo 20 cm | Fig 8. Geniculate Ganglion | Plate 1. Human Embryo 4 to 20 mm | Plate 2. Human Embryo 30 mm | Membranous Labyrinth and Nerves

Reference

Streeter GL. On the development of the membranous labyrinth and the acoustic and facial nerves in the human embryo. (1906) Amer. J Anat. 6:139-165.


Cite this page: Hill, M.A. (2019, March 26) Embryology Streeter1906 fig04.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Streeter1906_fig04.jpg

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© Dr Mark Hill 2019, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G

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