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Extensors of the forearm
The forearm is the region of the upper limb between the elbow joint proximally and wrist joint distally
Forearm Extensors
The forearm is the region of the upper limb between the elbow joint proximally and wrist joint distally
Elbow Joint
Forearm Extensors
The forearm is the region of the upper limb between the elbow joint proximally and wrist joint distally
Elbow JointWrist Joint
Forearm Extensors
The forearm is the region of the upper limb between the elbow joint proximally and wrist joint distally
Elbow JointWrist Joint
Forearm
Forearm Extensors
There are two long bones in the forearm
Forearm Extensors
There are two long bones in the forearm
Radius lies Laterally
Forearm Extensors
There are two long bones in the forearm
Radius
Ulna lies Medially
Forearm Extensors
The forearm is divided into 2 compartments by the Interosseous membrane and the Deep Fascia
Interosseous membrane
Forearm Extensors
The forearm is divided into 2 compartments by the Interosseous membrane and the Deep Fascia
Anterior Compartment or Flexor Compartment contain;• Superficial Flexors• Deep Flexors
Forearm Extensors
The forearm is divided into 4 compartments by the Interosseous membrane and the Deep Fascia
Anterior Compartment or Flexor Compartment contain;• Superficial Flexors• Deep Flexors
Posterior Compartment or Extensor Compartment contain;• Extensors• Mobile Wad of Three
Forearm Extensors
There are 2 groups of extensors;
• Superficial Extensor Compartment
• Deep Extensor compartment
Forearm Extensors
There are
• 7 muscles in the superficial group
• 5 muscles in the deep group
Forearm Extensors
Superficial Extensors
Forearm Extensors
Superficial Extensors
1.Brachioradialis
Forearm Extensors
Superficial Extensors
1.Brachioradialis
2.Extensor Carpi Radialis Longus
Forearm Extensors
Superficial Extensors
1.Brachioradialis
2.Extensor Carpi Radialis Longus
3.Extensor Carpi Radialis Brevis
Forearm Extensors
Superficial Extensors
1.Brachioradialis
2.Extensor Carpi Radialis Longus
3.Extensor Carpi Radialis Brevis
Collectively these muscles are also called
‘The Mobile Wad of Three’
Forearm Extensors
Superficial Extensors
1.Brachioradialis
2.Extensor Carpi Radialis Longus
3.Extensor Carpi Radialis Brevis
4.Extensor Digitorum
Forearm Extensors
Superficial Extensors
1.Brachioradialis
2.Extensor Carpi Radialis Longus
3.Extensor Carpi Radialis Brevis
4.Extensor Digitorum
5.Extensor Digiti Minimi
Forearm Extensors
Superficial Extensors
1.Brachioradialis
2.Extensor Carpi Radialis Longus
3.Extensor Carpi Radialis Brevis
4.Extensor Digitorum
5.Extensor Digiti Minimi
1.Extensor Carpi Ulnaris
Forearm Extensors
Superficial Extensors
1.Brachioradialis
2.Extensor Carpi Radialis Longus
3.Extensor Carpi Radialis Brevis
4.Extensor Digitorum
5.Extensor Digiti Minimi
1.Extensor Carpi Ulnaris
1.Anconeus
Forearm Extensors
Superficial Extensors
1.Brachioradialis
2.Extensor Carpi Radialis Longus
3.Extensor Carpi Radialis Brevis
4.Extensor Digitorum
5.Extensor Digiti Minimi
1.Extensor Carpi Ulnaris
1.Anconeus
Forearm Extensors
Deep Extensors
1.Abductor Pollicis Longus
Forearm Extensors
Deep Extensors
1.Abductor Pollicis Longus
2.Extensor Pollicis Longus
Forearm Extensors
Deep Extensors
1.Abductor Pollicis Longus
2.Extensor Pollicis Longus
3.Extensor Pollicis Brevis
Forearm Extensors
Deep Extensors
1.Abductor Pollicis Longus
2.Extensor Pollicis Longus
3.Extensor Pollicis Brevis
4.Extensor Indicis
Forearm Extensors
Deep Extensors
1.Abductor Pollicis Longus
2.Extensor Pollicis Longus
3.Extensor Pollicis Brevis
4.Extensor Indicis
5.Supinator
Forearm Extensors
Tendons at the wrist
1
2345
6
RadiusUlna
There are 6 compartments on the dorsal aspect of the wrist
Forearm Extensors
First Compartment
1. Abductor Pollicis Longus
2. Extensor Pollicis Brevis
1RadiusUlna
RadiusUlna
Forearm Extensors
Second Compartment
1. Extensor Carpi Radialis Longus
2. Extensor Carpi Radialis Brevis
RadiusUlna
2
Forearm Extensors
Third Compartment
Extensor Pollicis Longus
RadiusUlna
3
Forearm Extensors
Fourth Compartment
1. Extensor Indicis
2. Extensor Digitorum
RadiusUlna
4
Forearm Extensors
Fifth Compartment
Extensor Digiti Minimi
RadiusUlna
5
Forearm Extensors
Sixth Compartment
Extensor Carpi Ulnaris
RadiusUlna
6
Forearm Extensors
1. Abductor Pollicis Longus1. Extensor Pollicis Brevis
2. Extensor Carpi Radialis Longus2. Extensor Carpi Radialis Brevis
3. Extensor Pollicis Longus
4. Extensor Indicis4. Extensor Digitorum
5. Extensor Digiti Minimi
6. Extensor Carpi Ulnaris
Forearm Extensors
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6RadiusUln
a
Nerves
Brachioradialis Extensor Carpi Radialis Longus
Anconeus are supplied by the
Radial Nerve
Forearm Extensors
All the other extensor muscles are supplied by the
Posterior Interosseous Nerve
deep branch of the Radial Nerve
Forearm Extensors
Summary of Muscles
Posterior Forearm
BrachioradialisOrigin Proximal 2/3 of lateral
supracondylar ridge of humerus
Insertion Lateral surface of distal end of radius (base of styloid process)
Action Flexes forearmNerve Supply Radial nerve (C5, C6 and C7)
Blood Supply Radial recurrent artery
Extensor Carpi Radialis Longus
Origin Lateral supracondylar ridge of humerus
Insertion Base of 2nd metacarpal
Action Extends and abducts hand at wrist joint
Nerve Supply Radial nerve (C6 and C7)
Blood Supply Radial artery
Posterior Forearm
Posterior Forearm
Extensor Carpi Radialis Brevis
Origin Lateral supracondylar ridge of humerus
Insertion Base of 3rd metacarpal
Action Extends and abducts hand at wrist joint
Nerve Supply Deep branch of radial nerve (C7 and C8)
Blood Supply Radial artery
Posterior Forearm
Extensor DigitorumOrigin Common extensor origin on
lateral epicondyle of humerusInsertion Extensor expansions of medial
four digits (not thumb)Action Extends medial four digits at
metacarpophalangeal joints; Extends hand at wrist joint
Nerve Supply Posterior interosseous nerve (deep branch of radial nerve C7, C8)
Blood Supply Interosseous recurrent and posterior interosseous arteries
Posterior Forearm
Extensor Digiti MinimiOrigin Common extensor origin on
lateral epicondyle of humerusInsertion Extensor expansion of little
fingerAction Extends 5th digit at
metacarpophalangeal and interphalangeal joints
Nerve Supply Posterior interosseous nerve (deep branch of radial nerve C7, C8)
Blood Supply Interosseous recurrent artery
Posterior Forearm
Extensor Carpi UlnarisOrigin Common extensor origin on
lateral epicondyle of humerusInsertion Base of 5th metacarpal
Action Extends and adducts hand at wrist joint
Nerve Supply Posterior interosseous nerve, (deep branch of radial nerve C7, C8)
Blood Supply Ulnar artery
Posterior Forearm
AnconeusOrigin Lateral epicondyle of humerus
Insertion Posterior olecranon process of the ulna
Action Extends the elbow joint
Nerve Supply Radial nerve (C7, C8)
Blood Supply Posterior interosseous artery
Posterior Forearm
Abductor Pollicis LongusOrigin Posterior surfaces of ulna,
radius and interosseous membrane
Insertion Base of 1st metacarpal
Action Abducts thumb, extends thumb at carpometacarpal joint
Nerve Supply Posterior interosseous nerve (deep branch of radial nerve C7, C8)
Blood Supply Posterior interosseous artery
Posterior Forearm
Extensor Pollicis LongusOrigin Posterior surface of middle 1/3
of ulna and interosseous membrane
Insertion Base of distal phalanx of thumb
Action Extends distal phalanx of thumb at carpometacarpal and interphalangeal joints
Nerve Supply Posterior interosseous nerve (deep branch of radial nerve C7, C8)
Blood Supply Posterior interosseous artery
Posterior Forearm
Extensor Pollicis BrevisOrigin Posterior surfaces of radius
and interosseous membraneInsertion Base of proximal phalanx of
thumbAction Extends proximal phalanx of
thumb at carpometacarpal joint
Nerve Supply Posterior interosseous nerve (deep branch of radial nerve C7, C8)
Blood Supply Posterior interosseous artery
Posterior Forearm
Extensor IndicisOrigin Posterior surface of ulna and
interosseous membraneInsertion Extensor expansion of index
fingerAction Extends 2nd digit and helps to
extend handNerve Supply Posterior interosseous nerve
continuation deep branch radial nerve (C7, C8)
Blood Supply Posterior interosseous artery
Posterior Forearm
SupinatorOrigin Lateral epicondyle of humerus,
radial collateral and annular ligaments, supinator fossa and crest of ulna
Insertion Lateral, posterior and anterior surfaces of proximal 1/3 of radius
Action Supinates forearm
Nerve Supply Deep branch of radial nerve (C5 and C6)
Blood Supply Recurrent interosseous artery