Slideshow: Forearm Deep Flexors

The Forearm

Deep Flexor Compartment

The forearm is the region of the upper limb between the elbow joint proximally and wrist joint distally

Deep Forearm Flexors

Elbow Joint

Elbow JointWrist Joint

Forearm

There are two long bones in the forearm

Radius lies Laterally

Radius

Ulna lies Medially

The forearm is divided into 2 compartments by the Interosseous membrane and the Deep Fascia

Interosseous membrane

Anterior Compartment contains the • Superficial Flexors• Deep Flexors

Posterior Compartment contains the • Extensors• Mobile Wad of Three

There are

3 Deep Flexors

Deep Flexors

1.Flexor Digitorum Profundus

2.Flexor Poliicis Longus

3.Pronator Quadratus

Deep Flexors

2.Flexor Poliicis Longus

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

Deep Flexors

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)

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)

Deep Flexors

3. Pronator Quadratus

Arises from the Distal ¼ of Ulna

It inserts onto Distal ¼ of Radius

It pronates the forearm

Cross section through middle of forearm

Anterior or Volar Surface

Posterior or Dorsal Surface

Lateral

Lateral Medial

Lateral MedialSubcutaneous Fat

Lateral Medial

UlnaRadius

Lateral Medial

UlnaRadius

Lateral Medial

UlnaRadius

Extensor Compartment

Lateral Medial

UlnaRadius

Mobile Wad

Lateral Medial

UlnaRadius

Deep FlexorMobile

Superficial Flexors

Deep Flexor

Lateral Medial

UlnaRadius

Flexor Digitorum Profundus

Mobile Wad

Superficial Flexors

Deep Flexor

Lateral Medial

UlnaRadius

Mobile Wad

Superficial Flexors

Flexor Pollicis Longus Flexor Digitorum Profundus

All Deep Flexors

2.Flexor Pollicis Longus

Supplied by the Anterior Interosseous Nerve(a branch of the Median Nerve)

EXCEPTLateral half of FDP which is supplied by Ulnar Nerve

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

Anterior Forearm

Flexor Pollicis LongusOrigin 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

Pronator QuadratusOrigin Distal 1/4 of anterior

surface of ulnaInsertion Distal 1/4 of anterior

surface of radiusAction Pronates forearmNerve Supply Anterior interosseous nerve

from median nerve (C8 and T1

Blood Supply Anterior interosseous artery

Anterior Forearm

Slideshow: Forearm Deep Flexors

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