Slideshow: Forearm Deep Flexors The Funky Professor videos can be viewed here; www.thefunkyprofessor.com

1. The Forearm
Deep Flexor Compartment

2. The forearm is the region of the upper limb between
the elbow joint proximally and wrist joint distally
Deep Forearm Flexors

3. The forearm is the region of the upper limb between
the elbow joint proximally and wrist joint distally
Elbow Joint
Deep Forearm Flexors

4. Deep Forearm Flexors
The forearm is the region of the upper limb between
the elbow joint proximally and wrist joint distally
Elbow JointWrist Joint

5. Deep Forearm Flexors
The forearm is the region of the upper limb between
the elbow joint proximally and wrist joint distally
Elbow JointWrist Joint
Forearm

6. Deep Forearm Flexors
There are two long bones in the forearm

7. Deep Forearm Flexors
There are two long bones in the forearm
Radius lies Laterally

8. Deep Forearm Flexors
There are two long bones in the forearm
Radius
Ulna lies Medially

9. Deep Forearm Flexors
The forearm is divided into 2 compartments by the
Interosseous membrane and the Deep Fascia

10. Deep Forearm Flexors
The forearm is divided into 2 compartments by the
Interosseous membrane and the Deep Fascia
Anterior Compartment contains the
• Superficial Flexors
• Deep Flexors

11. Deep Forearm Flexors
The forearm is divided into 2 compartments by the
Interosseous membrane and the Deep Fascia
Anterior Compartment contains the
• Superficial Flexors
• Deep Flexors
Posterior Compartment contains the
• Extensors
• Mobile Wad of Three

12. Deep Forearm Flexors
There are
3 Deep Flexors

13. Deep Forearm Flexors
Deep Flexors
1.Flexor Digitorum Profundus
2.Flexor Poliicis Longus
3.Pronator Quadratus

14. Deep Forearm Flexors
Deep Flexors
1.Flexor Digitorum Profundus
2.Flexor Poliicis Longus
3.Pronator Quadratus
In contrast to the superficial flexors,
all of these muscles arise distal to the elbow joint and
hence do not cause movement at the elbow joint

15. Deep Forearm Flexors
Deep Flexors
1.Flexor Digitorum Profundus
Arises from the proximal ¾ of the Ulna and the Interosseous Membrane
It inserts via slender tendons onto the distal phalanges of the fingers
It flexes the Distal Interphalangeal Joints
(DIPJ)

16. Deep Forearm Flexors
Deep Flexors
2. Flexor Pollicis Longus
Arises from the Radius and the Interosseous
Membrane
It inserts onto the distal phalanx of the thumb
It flexes the thumb Interphalangeal Joint (IPJ)

17. Deep Forearm Flexors
Deep Flexors
3. Pronator Quadratus
Arises from the Distal ¼ of Ulna
It inserts onto Distal ¼ of Radius
It pronates the forearm

18. Deep Forearm Flexors
Cross section through middle of forearm

19. Deep Forearm Flexors
Anterior or Volar Surface

20. Deep Forearm Flexors
Anterior or Volar Surface
Posterior or Dorsal Surface

21. Deep Forearm Flexors
Anterior or Volar Surface
Posterior or Dorsal Surface
Lateral

22. Deep Forearm Flexors
Anterior or Volar Surface
Posterior or Dorsal Surface
Lateral Medial

23. Deep Forearm Flexors
Anterior or Volar Surface
Posterior or Dorsal Surface
Lateral Medial
Subcutaneous Fat

24. Deep Forearm Flexors
Anterior or Volar Surface
Posterior or Dorsal Surface
Lateral Medial

25. Deep Forearm Flexors
Anterior or Volar Surface
Posterior or Dorsal Surface
Lateral Medial
Ulna

26. Deep Forearm Flexors
Anterior or Volar Surface
Posterior or Dorsal Surface
Lateral Medial
Ulna

27. Deep Forearm Flexors
Anterior or Volar Surface
Posterior or Dorsal Surface
Lateral Medial
Ulna
Radius

28. Deep Forearm Flexors
Anterior or Volar Surface
Posterior or Dorsal Surface
Lateral Medial
Ulna
Radius

29. Deep Forearm Flexors
Anterior or Volar Surface
Posterior or Dorsal Surface
Lateral Medial
Ulna
Radius
Extensor
Compartment

30. Deep Forearm Flexors
Anterior or Volar Surface
Posterior or Dorsal Surface
Lateral Medial
Ulna
Radius
Extensor
Compartment
Mobile
Wad

31. Deep Forearm Flexors
Anterior or Volar Surface
Posterior or Dorsal Surface
Lateral Medial
Ulna
Radius
Extensor
Compartment
Deep
Flexor
Mobile
Wad
Superficial Flexors
Deep
Flexor

32. Deep Forearm Flexors
Anterior or Volar Surface
Posterior or Dorsal Surface
Lateral Medial
Ulna
Radius
Extensor
Compartment
Flexor Digitorum Profundus
Mobile
Wad
Superficial Flexors
Deep
Flexor

33. Deep Forearm Flexors
Anterior or Volar Surface
Posterior or Dorsal Surface
Lateral Medial
Ulna
Radius
Extensor
Compartment
Mobile
Wad
Superficial Flexors
Flexor Pollicis
Longus Flexor Digitorum Profundus

34. Deep Forearm Flexors
All Deep Flexors
1.Flexor Digitorum Profundus
2.Flexor Pollicis Longus
3.Pronator Quadratus
Supplied by the Anterior Interosseous Nerve
(a branch of the Median Nerve)
EXCEPT
Lateral half of FDP which is
supplied by Ulnar Nerve

35. Anterior Forearm
Flexor Digitorum Profundus
Origin Proximal 3/4 of medial and anterior
surfaces of ulna and interosseous
membrane
Insertion Base of the distal phalanges of digits
2 - 5
Action Flexes distal phalanges at distal
interphalangeal joints of medial four
digits; assists with flexion of hand
Nerve Supply Medial part: ulnar nerve; Lateral
part: anterior interosseous branch
of median nerve (C8 and T1)
Blood Supply Ulnar and anterior interosseous
arteries

36. Anterior Forearm
Flexor Pollicis Longus
Origin Anterior surface of radius and
adjacent interosseous
membrane
Insertion Base of distal phalanx of thumb
Action Flexes interphalangeal joint of
1st digit (thumb)
Nerve Supply Anterior interosseous nerve
from median nerve (C8 and T1)
Blood Supply Anterior interosseous artery

37. Pronator Quadratus
Origin Distal 1/4 of anterior surface of
ulna
Insertion Distal 1/4 of anterior surface of
radius
Action Pronates forearm
Nerve Supply Anterior interosseous nerve
from median nerve (C8 and T1
Blood Supply Anterior interosseous artery
Anterior Forearm