Hand and Fingers (metacarpophalangeal, proximal and distal interphalangeal joints)

Question 1

Extension of the Second through Fifth fingers (antagonists on flexion)

Answer 1

• Extensor digitorum
• Lumbricals
• Dorsal interossei (2nd-4th, assists)
• Palmar interossei (2nd, 4th, 5th, assists)
• Extensor indicis (2nd)

Question 2

Flexion of the Second through Fifth fingers (antagonists on extension)

Answer 2

• Flexor digitorum superfacialis
• Flexor digitorum profondus
• Flexor digiti minimi brevis (5th)
• Lumbricals
• Dorsal interossei (2nd-4th, assists)
• Palmar interossei (2nd, 4th, 5th, assists)

Question 3

Abduction of the Second through Fifth fingers (antagonists on adduction of fingers)

Answer 3

• Dorsal interossei (2nd-4th)
• Abductor digiti minimi (5th)

Question 4

Adduction of the Second through Fifth fingers (antagonists on abduction of fingers)

Answer 4

• Palmar interossei (2nd, 4th, 5th)
• Extensor indicis (2nd)

Question 5

Opposition of the Fifth finger

Answer 5

• Opponens digiti minimi
• Abductor digiti minimi (assists)
• Flexor digiti minimi brevis (1st, assists)