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Fig. 903. Cochlear Duct and Ganglia

Transverse section of the cochlear duct of a fetal cat. (After Boettcher and Ayres.)

The mesodermal tissue surrounding the various parts of the epithelial labyrinth is converted into a cartilaginous ear-capsule, and this is finally ossified to form the bony labyrinth. Between the cartilaginous capsule and the epithelial structures is a stratum of mesodermal tissue which is differentiated into three layers, viz., an outer, forming the periosteal lining of the bony labyrinth; an inner, in direct contact with the epithelial structures; and an intermediate, consisting of gelatinous tissue: by the absorption of this latter tissue the perilymphatic spaces are developed. The modiolus and osseous spiral lamina of the cochlea are not preformed in cartilage but are ossified directly from connective tissue.

Links: Inner Ear Development | Cat Development

Categories: Hearing | Outer Ear | Middle Ear | Inner Ear | Balance

Historic Embryology - Hearing
Historic Embryology: 1880 Platypus cochlea \| 1892 Vertebrate Ear \| 1902 Development of Hearing \| 1906 Membranous Labyrinth \| 1910 Auditory Nerve \| 1913 Tectorial Membrane \| 1918 Human Embryo Otic Capsule \| 1918 Cochlea \| 1918 Grays Anatomy \| 1922 Human Auricle \| 1922 Otic Primordia \| 1931 Internal Ear Scalae \| 1932 Otic Capsule 1 \| 1933 Otic Capsule 2 \| 1936 Otic Capsule 3 \| 1933 Endolymphatic Sac \| 1934 Otic Vesicle \| 1934 Membranous Labyrinth \| 1934 External Ear \| 1938 Stapes - 7 to 21 weeks \| 1938 Stapes - Term to Adult \| 1940 Stapes \| 1942 Stapes - Embryo 6.7 to 50 mm \| 1943 Stapes - Fetus 75 to 150 mm \| 1946 Aquaductus cochleae and periotic (perilymphatic) duct \| 1946 aquaeductus cochleae \| 1948 Fissula ante fenestram \| 1948 Stapes - Fetus 160 mm to term \| 1959 Auditory Ossicles \| 1963 Human Otocyst \| Historic Disclaimer

Historic Disclaimer - information about historic embryology pages
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
	iTunes link \| iBooks Store Description - an extract of the embryology content from Anatomy of the Human Body By Henry Gray Philadelphia: Lea & Febiger, 1918. Releases First Edition - Jan 2012 Second Edition - March 2012 Repaired formatting and image display issues related to Pad rotated display and minor editing issues. Print length 169 pages, 41.6 MB, Language English. The current website also includes numerous images from this textbook, see Anatomy of the Human Body by Henry Gray and Category:Gray's 1918 Anatomy. Note the also Historic Disclaimer.

Reference

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

Cite this page: Hill, M.A. (2024, April 18) Embryology Gray0903.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Gray0903.jpg

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