File:Anson1948 fig15.jpg

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Fig. 15. Drawings of a reconstruction of the stapes in a 275 mm

(30 week) fetus (Wisconsin series 4) ; X 7: (a) the reconstruction entire, viewed from above (superior, or cranial, aspect); (b) the neck and adjacent portions of the crura, in lateral (tympanic) view; (c) the base of the ossicle seen in medial (vestibular) view.

The stapes has attained adult form; of the crura, now deeply channeled, the posterior is longer and larger (as); the base is flatter on the posterior than on the anterior margin (c) ; the head and neck are hollowed (b). In this fetal specimen, as in some adult ossicles, a ledge of bone partially closes the space of the neck toward the obturator foramen.


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. (2019, June 18) Embryology Anson1948 fig15.jpg. Retrieved from

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© Dr Mark Hill 2019, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G

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