Sheaths and mesotendons of the tendons of the extensor carpi radialis longus and brevis muscles and of the tendon of the extensor pollicis longus muscle.
D000328:Adult; D000368:Aged; D005260:Female; D006225:Hand / Q000033:anatomy & histology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009132:Muscles / Q000033:anatomy & histology*; D013710:Tendons / Q000033:anatomy & histology*