Fig. 6
From: MR microscopy of the human fetal upper extremity – a proof-of-principle study
Development of the muscles and tendons at different developmental ages. a Axial T2w image of the left forearm of 8-week GA specimen at the mid-diaphyseal level demonstrates the characteristic organization of the muscles along the dorsoventral axis. The ossification centers of radius and ulna appear hypointens compared to the muscles. d = dorsal; v = ventral; u = ulnar; r = radial; white arrow = flexor digitorum muscles. b Coronal T2w image of a 9-week GA specimen demonstrates the course of the flexor digitorum tendons. c Axial T2w image of a 10-week GA specimen at the level of the thenar demonstrates the course of the short palmar muscles of the thumb. d Sagittal T2w image of early 9-week GA specimen with the course of the extensor carpi radialis longus tendon (black arrow) to the base of the second metacarpal bone. White arrow indicates ossification center of the radius; white arrowhead indicates scaphoid