Inner Ear - Anatomical Details

Anatomical Details

Top image is antero-lateral and bottom image is postero-medial.

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 top image, 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
21. Section of the facial and acoustic nerves within internal acoustic meatus (the separation between them is not apparent in the section)
22. (No entry)
23. Vestibulocochlear nerve (auditory or acoustic, cranial nerve VIII)