Paper - Stapes, fissula ante fenestram and associated structures in man 5

Embryology - 26 Apr 2024 Expand to Translate
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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 26) 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

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