File:Streeter1906 fig03.jpg

FIG.4. Diagram representing the growth and stages of differentiation of the human membranous labyrinth. At 31h weeks (6-7 mm.) the ear vesicle consists of two simple pouches, into the upper of which opens the endolymphatic appendage. At 4 weeks sac.endolymph. ,sac, endolymph. duct. endolymph., (9 mm.) there is at the base of the vestibular pouch an atrium, the space destined to form the utricle and saccule. At 5 weeks (12 mm.) this space is circumscribed from the cochlear pouah below by a constriction corresponding to the ductus reuniens, and above Prom the rest of the vestibular pouch by the formation of the semicircular canals. At 6 weeks (20 mm.) an ingrowth of the wall of the atrium divides it intoanupper part (utricle) and lower part (saccule). At 10 weeks (30 mm.) this partition between the utricle and saccule is complete and extends inward .in such a way asto split the orifice of the endolymphatic duct.

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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

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  Fig 1 Membranous Labyrinth Human Embryo 14 mm

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  Fig 2 30mm Embryo

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  Fig 3 Semicircular canal

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  Fig 4 Membranous Labyrinth Growth

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  Fig 5 Acoustic nerve complex

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  Fig 6 Facial-acoustic Complex Human Embryo 7 mm

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  Fig 7 Facial Nerve Pig Embryo 20 cm

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  Fig 8 Geniculate Ganglion Human Embryo 30 mm

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  Plate 1. Membranous Labyrinth Human Embryo 4 to 20 mm

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  Plate 2. Membranous Labyrinth Human Embryo 30 mm

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. (2026, October 4) Embryology Streeter1906 fig03.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Streeter1906_fig03.jpg

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© Dr Mark Hill 2026, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G