yogabook / muscles / hand / flexor pollicis brevis
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M. flexor pollicis brevis
the short thumb flexor located in the thenar
Origin: caput superficiale: retinaculum flexorum; caput profundum: os trapezium, os trapezoideum, os capitatum
Attachment: radial sesamoid bone of the metacarpophalangeal joint of the thumb
Innervation: Nervus medianus from Plexus brachialis from C8 with fibres from C7 and Th1
Antagonists:
Movement: Flexion of the metacarpophalangeal joint of the thumb, abduction or adduction, brings the thumb into opposition