File:Anson1948 fig13.jpg

Fig. 13. Drawings of a reconstruction of the stapes in a 210 mm

Drawings of a reconstruction of the stapes in a 210 mm. (23 week) fetus (Wisconsin series 51) ; X 7: (a) reconstruction entire, seen from a superclateral position; (b) basal portion of the posterior crus and the adjacent posterior third of the base, seen as though from the obturator space.

Almost all of the obturator wall has been resoi-bed; that portion which remains is foraminous (arrow through a foramen in a). The obturator surface of the base is irregularly eroded; a portion of it persists as the crista stapedis (beneath which crest an arrow passes in a and b). The cartilage. which remains on the articular surface of the head is permanent (a); on the base not only does it cover the vestibular surface, but also is carried over the periphery of the base along the surface related to the vestibular window (I), at cut edge). A remnant portion of the original periosteal bone (encircled by ring in b) is fusing with the newly formed endochondral plate on the vestibular aspect of the base.

Reference

Anson BJ. and Cauldwell EW. Stapes, fissula ante fenestram and associated structures in man: V . From the fetus of 160 mm to term. (1948) 48(3): 263-300.

Cite this page: Hill, M.A. (2024, April 19) Embryology Anson1948 fig13.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Anson1948_fig13.jpg

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