Actions Of Limbs

Question 1

Reaching for glass

Answer 1

Scapula stabilised by pectoralis minor medial pectoral nerve
Slightly protracted via serratus anterior by long thoracic nerve

Glenohumeral joint has flexed
Pectoralis major claivular head pectoral nerves
Deltoid (anterior fibres) axillary nerve

Elbow is flexion
Brachioradialis by radial
Brachial and biceps musculocutaneous

Question 2

Grasping glass

Answer 2

Thumb adducted via abductor policis longus (radial) and brevis (median)

Wrist is extended and supported against gravity
Extensor carpi radialis longus radial nerve
Extensor carpi radialis brevis and extensor carpi ulnaris by radial

Fingers extend
Extensor digitorum, indices and digiti minimi by radial
Abducted by dorsal interosseous by ulnar

Question 3

Clasping tumbler

Thumb and fingers

Answer 3

Thumb adducted
Adductor policis by ulnar

Thumb flexed
Flexor policis longus by median
Flexor policis brevis by median

Fingers adducted
Palmar interossei by ulnar

Fingers flexed
Flexor digitorum superficialis by median
Flexor digitorum profundus by median (index and middle) and ulnar (ring and little)