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. 2012 Mar 19;220(6):580–590. doi: 10.1111/j.1469-7580.2012.01496.x

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© 2012 The Authors. Journal of Anatomy © 2012 Anatomical Society

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Fig. 1 — (A) Human embryo: G.G.-1 (16 mm), O’Rahilly stage 18. Transverse section (8 μm thick). AR, apical ridge; CM, carpal mass formed by very condensed mesenchyme; FB, cartilage mold for the future bones of the forearm; MN, median nerve; MV, vascular traces of marginal vein; TE, future thenar eminence. (12) Second metacarpal bone in a very immature chondrogenic phase. (13) Third metacarpal bone in a very immature chondrogenic phase. Scale bar: 125 μm. (B) Human embryo: P.E.-8 (23 mm), O’Rahilly stage 22. Transverse section (8 μm thick). OC, os central. (1) Distal epiphysis of the radius. (3) Capitate bone. (4) Scaphoid. (8) Trapezium bone. (9) Trapezoid bone. (11) First metacarpal bone. (12) Second metacarpal bone. (13) Third metacarpal bone. (16) Phalanx. Scale bar: 125 μm.