Embryology - 30 Apr 2024 Expand to Translate
Google Translate - select your language from the list shown below (this will open a new external page)
العربية \| català \| 中文 \| 中國傳統的 \| français \| Deutsche \| עִברִית \| हिंदी \| bahasa Indonesia \| italiano \| 日本語 \| 한국어 \| မြန်မာ \| Pilipino \| Polskie \| português \| ਪੰਜਾਬੀ ਦੇ \| Română \| русский \| Español \| Swahili \| Svensk \| ไทย \| Türkçe \| اردو \| ייִדיש \| Tiếng Việt These external translations are automated and may not be accurate. (More? About Translations)

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)

Online Editor

This 1943 paper by Anson describes human fetal development of the middle ear.

The fissula ante fenestram is a small connective tissue-filled cleft located where the tendon of tensor tympani turns laterally toward the malleus.
Modern Notes:

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

Fetal Development

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)

Stapes, Fissula ante fenestram and Associated Structures in man: V . From the Fetus of 160 mm to Term

Previous studies traced the development of these structures from the 6.7mm. to the 150mm. stages (CR length).

A solitary basal osteogenetic center appears in the 150mm. fetus. In sucoesaive developmentd stages it encroaches on posterior cruq anterior cru~, and neck, in that order; no secondary centers of ossification occur. Progressive invasion (180 mm., 183mm., 190 mm.) results in destruction of cartilage, with the exception of articular surfaces, and replacement by bone; the periosteal shell is filled with intra- and endochondral bone and primitive marrow. The internal bony wall of crura, base and head are then entirely removed (205 mm, 210 mm, 240 mm.), leaving a flattened bilaminar basal plate, guttered crura, and excavated cylindrical neck; marrow is completely absorbed, except in the neck. At 275 mm. the capital extremity is still massive, but active osteoclasis reduces its bulk to that of the “adult ” pattern, observed at 290 mm. By 345 mm. the stapes is virtually in- distinguishable from that of the adult.

Like the articular surfaces of the stapes, the fissula ante fenestram represents an area of retarded histogenesis. Hyalin capsular cartilage envelops the fibrous fissula until the 210 mm. stage; thereafter, the fissula itself is chondrified and persists indefinitely as an unstable zone of cartilage in the petrous bone. The osseous structure of the stapes is identical with that of the otic capsule.

Cite this page: Hill, M.A. (2024, April 30) Embryology Paper - Stapes, fissula ante fenestram and associated structures in man 5. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Paper_-_Stapes,_fissula_ante_fenestram_and_associated_structures_in_man_5

What Links Here?