File:O'Rahilly1957 fig01.jpg

Fig. 1. Frontal section of hand of embryo, Carnegie no. 8789

Carnegie no. 8789 11.7 mm.11.7 mm., horizon xvii. X56. Senior's stage 1. lilastemal condensations of digits 2 to 5. Radius and ulna are chondrifying. Carpus is blastemal, except very early chondrification in metacarpals 3 and 4, barely suggested in this figure by lighter-staining areas (arrows).

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Reference

O'Rahilly R. Gray DI. and Gardner E. Chondrification in the hands and feet of staged human embryos. (1957) Carnegie Instn. Wash. Publ. 611, Contrib. Embryol., 36:

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