From Embryology

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Right Human Membranous Labyrinth

Right human membranous labyrinth, removed from its bony enclosure and viewed from the antero-lateral aspect. (G. Retzius.)

(G. Retzius.)


1. Lateral semicircular canal 1’, its ampulla

2. Posterior canal 2’, its ampulla.

3. Superior canal; 3’, its ampulla.

4. Conjoined limb of superior and posterior canals (sinus utriculi superior).

5. Utricle. 5’. Recessus utriculi. 5”. Sinus utriculi posterior.

6. Ductus endolymphaticus.

7. Canalis utriculosaccularis.

8. Nerve to ampulla of superior canal.

9. Nerve to ampulla of lateral canal.

10. Nerve to recessus utriculi (in Fig. 925, the three branches appear conjoined). 10’. Ending of nerve in recessus utriculi.

11. Facial nerve.

12. Lagena cochleæ.

13. Nerve of cochlea within spiral lamina.

14. Basilar membrane.

15. Nerve fibers to macula of saccule.

16. Nerve to ampulla of posterior canal.

17. Saccule.

18. Secondary membrane of tympanum.

19. Canalis reuniens.

20. Vestibular end of ductus cochlearis.

23. Section of the facial and acoustic nerves within internal acoustic meatus (the separation between them is not apparent in the section).

The Semicircular Ducts

(ductus semicirculares; membranous semicircular canals), (Fig. 925, Fig. 926).—The semicircular ducts are about one-fourth of the diameter of the osseous canals, but in number, shape, and general form they are precisely similar, and each presents at one end an ampulla. They open by five orifices into the utricle, one opening being common to the medial end of the superior and the upper end of the posterior duct. In the ampullæ the wall is thickened, and projects into the cavity as a fiddle-shaped, transversely placed elevation, the septum transversum, in which the nerves end.

The utricle, saccule, and semicircular ducts are held in position by numerous fibrous bands which stretch across the space between them and the bony walls.

(Text modified from Gray's 1918 Anatomy)

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Gray H. Anatomy of the human body. (1918) Philadelphia: Lea & Febiger.

Cite this page: Hill, M.A. (2024, June 13) Embryology Gray0925.jpg. Retrieved from

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current07:41, 19 August 2012Thumbnail for version as of 07:41, 19 August 2012693 × 500 (84 KB)Z8600021 (talk | contribs)Right human membranous labyrinth, removed from its bony enclosure and viewed from the antero-lateral aspect. (G. Retzius.)

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