2.下列何組答案之肌肉群是可協助手部做一打開手（opening hand）的動作？
(A)flexor carpi radialis、extensor indicis、palmar interossei、lumbricals
(B)abductor pollicis、flexor pollicis brevis、opponens digiti minimi、lumbricals
(C)palmaris longus、extensor pollicis longus、dorsal interossei、flexor digitorum superficialis
(D)extensor digitorum、abductor pollicis longus、extensor pollicis brevis、extensor digiti minimi

(A)

flexor carpi radialis-手腕flex.

extensor indicis-食指ext.

palmar interossei-手指add&MP flex.

lumbricals-IP ext. &MP flex.

(B)

abductor pollicis-拇指abd.

flexor pollicis brevis-拇指flex.&add.

opponens digiti minimi-對掌

lumbricals-MP flex.&IP ext.

(C)

palmaris longus-手腕 flex.

extensor pollicis longus-拇指flex.

dorsal interossei-手指abd.&MP flex.

flexor digitorum superficialis-手指flex.

(D)

extensor digitorum-手指ext.

abductor pollicis longus-拇指abd.

extensor pollicis brevis-拇指ext.

extensor digiti minimi-小指flex. & 手腕ext.