File:Gray0928.jpg: Difference between revisions

From Embryology
No edit summary
 
(2 intermediate revisions by the same user not shown)
Line 1: Line 1:
==Cross-section of Cochlea==
==Cross-section of Cochlea==


{{Template:Grays Anatomy}}
Ductus Cochlearis (membranous cochlea; scala media)
 
* ductus cochlearis consists of a spirally arranged tube enclosed in the bony canal of the cochlea and lying along its outer wall. 
* osseous spiral lamina extends only part of the distance between the modiolus and the outer wall of the cochlea
* basilar membrane stretches from its free edge to the outer wall of the cochlea, and completes the roof of the scala tympani.
* vestibular membrane (Reissneri), a second and more delicate membrane, extends from the thickened periosteum covering the osseous spiral lamina to the outer wall of the cochlea
** it is attached at some little distance above the outer edge of the basilar membrane.
* ductus cochlearis or scala media (Fig. 928) is the canal thus shut off between the scala tympani below and the scala vestibule above
** triangular on transverse section, its roof being formed by the vestibular membrane
** outer wall by the periosteum lining the bony canal
** floor by the membrana basilaris and the outer part of the lamina spiralis ossea.
** extremities are closed; the upper is termed the lagena and is attached to the cupula at the upper part of the helicotrema; the lower is lodged in the recessus cochlearis of the vestibule.
* canalis reuniens of Hensen (Fig. 924) a narrow, short canal, located at the lower end the ductus cochlearis brought into continuity with the saccule.
* On the membrana basilaris is situated the spiral organ of Corti.
* The vestibular membrane is thin and homogeneous, and is covered on its upper and under surfaces by a layer of epithelium.
* The periosteum, forming the outer wall of the ductus cochlearis, is greatly thickened and altered in character, and is called the spiral ligament.
** projects inward below as a triangular prominence, the basilar crest, which gives attachment to the outer edge of the basilar membrane
** immediately above the crest is a concavity, the sulcus spiralis externus.
** stria vascularis forms the upper portion of the spiral ligament contains numerous capillary loops and small bloodvessels.
 
 
{{Template:Gray Anatomy}}


[[Category:Historic Embryology]] [[Category:Gray's 1918 Anatomy]] [[Category:Cartoon]]
[[Category:Historic Embryology]] [[Category:Gray's 1918 Anatomy]] [[Category:Cartoon]]
[[Category:Senses]] [[Category:Hearing]]
[[Category:Senses]] [[Category:Hearing]]

Latest revision as of 10:39, 28 October 2011

Cross-section of Cochlea

Ductus Cochlearis (membranous cochlea; scala media)

  • ductus cochlearis consists of a spirally arranged tube enclosed in the bony canal of the cochlea and lying along its outer wall.
  • osseous spiral lamina extends only part of the distance between the modiolus and the outer wall of the cochlea
  • basilar membrane stretches from its free edge to the outer wall of the cochlea, and completes the roof of the scala tympani.
  • vestibular membrane (Reissneri), a second and more delicate membrane, extends from the thickened periosteum covering the osseous spiral lamina to the outer wall of the cochlea
    • it is attached at some little distance above the outer edge of the basilar membrane.
  • ductus cochlearis or scala media (Fig. 928) is the canal thus shut off between the scala tympani below and the scala vestibule above
    • triangular on transverse section, its roof being formed by the vestibular membrane
    • outer wall by the periosteum lining the bony canal
    • floor by the membrana basilaris and the outer part of the lamina spiralis ossea.
    • extremities are closed; the upper is termed the lagena and is attached to the cupula at the upper part of the helicotrema; the lower is lodged in the recessus cochlearis of the vestibule.
  • canalis reuniens of Hensen (Fig. 924) a narrow, short canal, located at the lower end the ductus cochlearis brought into continuity with the saccule.
  • On the membrana basilaris is situated the spiral organ of Corti.
  • The vestibular membrane is thin and homogeneous, and is covered on its upper and under surfaces by a layer of epithelium.
  • The periosteum, forming the outer wall of the ductus cochlearis, is greatly thickened and altered in character, and is called the spiral ligament.
    • projects inward below as a triangular prominence, the basilar crest, which gives attachment to the outer edge of the basilar membrane
    • immediately above the crest is a concavity, the sulcus spiralis externus.
    • stria vascularis forms the upper portion of the spiral ligament contains numerous capillary loops and small bloodvessels.



Gray's Images: Development | Lymphatic | Neural | Vision | Hearing | Somatosensory | Integumentary | Respiratory | Gastrointestinal | Urogenital | Endocrine | Surface Anatomy | iBook | Historic Disclaimer
Historic Disclaimer - information about historic embryology pages 
Mark Hill.jpg
Pages where the terms "Historic" (textbooks, papers, people, recommendations) 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, interpretations and recommendations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)
iBook - Gray's Embryology  
Grays Anatomy Embryology cover.jpg

Reference

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


Cite this page: Hill, M.A. (2024, March 30) Embryology Gray0928.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Gray0928.jpg

What Links Here?
© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current01:18, 28 September 2009Thumbnail for version as of 01:18, 28 September 2009600 × 408 (56 KB)S8600021 (talk | contribs)