Semicircular canals
This image
is part of a series which can be scrolled interactively with the mousewheel or mouse dragging. This is done by using Template:Imagestack. The series is found in the category Temporal bone in computertomography case 001. Felsenbein in der Computertomographie. Bilder für scrollbaren Stapel.
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{{Information |description = |Other fields 1 = {{Information field|Name={{Ucfirst:{{Plate}}}}|Value=901}} |date = {{Other date|before|1858}} |source = *{{cite book |year=1918 |author=[[:en:Henry Gray|Henry Gray]] |title=Anatomy of the Human Body }} (See "{{Section header|Book}}" section below) *{{Gray"s Anatomy/link|901}} |author = {{Creator:Henry Vandyke Carter}} |other_versions = |permission = }} == {{Section header|Book}} == {{Gray"s Anatomy}} =={{int:license-header}}== {{PD-scan|PD-old-100-1923}} [[Category:Gray"s Anatomy plates|0901]] [[Category:Anatomical plates and drawings of the
Position of
the right bony labyrinth of the ear in the skull, viewed from above. The temporal bone is considered transparent and the labyrinth drawn in from a corrosion preparation. (Spalteholz.)
Right human
membranous labyrinth, removed from its bony enclosure and viewed from the antero-lateral aspect. (G. Retzius.)
The same from
the postero-medial aspect. 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). (G. Retzius.)
Transverse
section of a human semicircular canal and duct (after Rüdinger).
Petrous part
of temporal bone • Normal petrous temporal bone CT - Ganzer Fall bei Radiopaedia
Inner ear •
Inner and middle ear anatomy - Ganzer Fall bei Radiopaedia
The three semicircular canals (SCCs) are components of the bony labyrinth within the petrous temporal bone, along with the cochlea and vestibule. They contain the semicircular ducts, part of the membranous labyrinth which are responsible for kinetic balance.
Gross anatomy
There are three semicircular canals on each side, the superior, posterior and lateral canals, each forming two-thirds of a full circle, which are oriented perpendicular (at right angles) to each other.
The lateral semicircular canal opens directly into the vestibule, whilst the superior and posterior semicircular canals form a common crus before entering the vestibule. They have differing and variable lengths but uniform diameters of ~1 mm.
Superior (anterior) semicircular canal (SSCC)
- oriented in the vertical plane perpendicular (transverse) to the long axis of the petrous temporal bone
- it lies under the arcuate eminence on the anterior surface of the petrous temporal bone
- hair cells of the superior semicircular duct supplied by the superior division of the vestibulocochlear nerve (CN VIII)
Posterior semicircular canal (PSCC)
- oriented in the vertical plane parallel to the long axis of the petrous temporal bone
- hair cells of the posterior semicircular duct supplied by the inferior division of CN VIII
Lateral (horizontal) semicircular canal (LSCC)
- oriented 30° to the horizontal
- shortest of the semicircular canals
- hair cells of the lateral semicircular duct supplied by the superior division of CN VIII
Related pathology
- benign paroxysmal positional vertigo
- semicircular canal dehiscence
- superior semicircular canal dehiscence syndrome
- posterior semicircular canal dehiscence syndrome
- lateral semicircular canal dehiscence syndrome
Siehe auch:
und weiter:
Assoziationen und Differentialdiagnosen zu Semicircular canal (SCC):
