1. Hand
Bones
Joints
Muscles
Vessels & Nerves

2. Muscles of the hand
Extrinsic muscles - flexors of fingers - extensors of fingers - long muscles of the thumb
Intrinsic muscles - thenar region - hypothenar region - intermediate region

3. Extrinsic muscles
flexors of fingers: - Flexor digitorum superficialis - Flexor digitorum profundus
extensors of fingers: - Extensor digitorum - Extensor digiti minimi - Extensor indicis
long muscles of the thumb: - Flexor pollicis longus - Abductor pollicis longus - Extensor pollicis brevis - Extensor pollicis longus

4. Intrinsic muscles
Thenar region: - Abductor pollicis brevis - Flexor pollicis brevis - Opponens pollicis
Hypothenar region: - Abductor digiti minimi - Flexor digiti minimi brevis - Opponens digiti minimi
Intermediate region: - Lumbricals - Adductor pollicis - Interossei

5. Extrinsic muscles (flexors)

6. Long flexors of fingers

7. Flexor tendon insertion
Action:
flexion in MP&IP joints
How can we flex just MP?

8. Muscles of the Anterior Compartment of the Forearm
Superficial:
Pronator Teres Flexor Carpi Radialis Palmaris Longus Flexor Digitorum Superficialis Flexor Carpi Ulnaris
Deep:
Flexor Digitorum Profondus Flexor Pollicis Longus Pronator Quadratus

9. Extrinsic muscles (extensors)

10. Extrinsic muscles

11. Anatomic snuffbox

12. Anatomic Snuffbox Extensor pollicis brevis/Abductor pollicis longus
Extensor pollicis longus
Scaphoid
Radial a

13. Extensor tendon insertion

14. Superficial: Deep: Post.Compartment m. Brachioradialis
Extensor Carpi Radialis Longus
Extensor Carpi Radialis Brevis
Extensor Digitorum
Extensor Digiti Minimi
Extensor Carpi Ulnaris
Anconeus
Deep:
Supinator
Abductor Pollicis Longus
Extensor Pollicis Brevis
Extensor Pollicis Longus
Extensor Indicis

15. Intrinsic muscles
Thenar region: - Abductor pollicis brevis - Flexor pollicis brevis - Opponens pollicis
Hypothenar region: - Abductor digiti minimi - Flexor digiti minimi brevis - Opponens digiti minimi
Intermediate region: - Lumbricals - Adductor pollicis - Interossei

16. Intrinsic muscles

17. henar & hypothenar muscles
Insertion: 1- deep attaches to Metacarpal 2- superficial to P. Phalanx
origin:
1. flex. retinaculum

18. thenar & hypothenar muscles
2. Origin of thenar & hypothenar muscles
Trap. tubercle
Ham. hook
Scapho. tubercle
Pisifo.

19. Intrinsic muscles
Thenar region: - Abductor pollicis brevis - Flexor pollicis brevis - Opponens pollicis
Hypothenar region: - Abductor digiti minimi - Flexor digiti minimi brevis - Opponens digiti minimi
Intermediate region: - Adductor pollicis -Lumbricals -Interossei

20. Intermediate region
Adductor pollicis

21. Intermediate region
Dorsal Interossei
Function: Dab

22. Intermediate region
Palmar Interossei
Function: Pad

23. Intermediate region
lumbricals
Function: MP flex. !

24. Intermediate region muscles insertion: Extensor hood

26. Extensor & flexor mechanism
The extensor mechanism is the name for the tendon complex (green) that extends the finger. It is much more complex than the flexor mechanism (brown). The two systems interact in a complex manner.

27. Tendon insertion Action: pad/dab
Function: MP flex.
Action:
pad/dab
Flexion in MP and extension in IP joints
How can we flex just MP?