Hand/pols

6 belangrijke vragen over Hand/pols


Pronator Teres
Behoort tot welk compartiment?
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Superficiale spier in anterior compartiment onderarm.

The lateral border of the pronator teres forms the medial border of the cubital fossa, an anatomical triangle located over the elbow.
  • Attachments: It has two origins, one from the medial epicondyle, and the other from the coronoid process of the ulna. It attaches laterally to the mid-shaft of the radius.
  • Actions: Pronation of the forearm.
  • Innervation: Median nerve.

Supinator
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Aanhechting, functie, innervatie?

Diepe spieren posterior compartiment onderarm.


The supinator lies in the floor of the cubital fossa. It has two heads, which the deep branch of the radial nerve passes between.
  • Attachments: It has two heads of origin. One originates from the lateral epicondyle of the humerus, the other from the posterior surface of the ulna. They insert together into the posterior surface of the radius.
  • Actions: Supinates the forearm.
  • Innervation: Radial nerve (deep branch).

Abductor pollicis longus
Behoort tot welk compartiment?
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Diepe spier posterior compartiment onderarm.

The abductor pollicis longus is situated immediately distal to the supinator muscle. In the hand, its tendon contributes to the lateral border of the anatomical snuffbox.
  • Attachments: Originates from the interosseous membrane and the adjacent posterior surfaces of the radius and ulna. It attaches to the lateral side of the base of metacarpal I.
  • Actions: Abducts the thumb.
  • Innervation: Radial nerve (posterior interosseous branch).
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Extensor pollicis brevis
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Diepe spier posterior compartiment onderarm.

The extensor pollicis brevis can be found medially and deep to the abductor pollicis longus. In the hand, its tendon contributes to the lateral border of the anatomical snuffbox.
  • Attachments: Originates from the posterior surface of the radius and interosseous membrane. It attaches to the base of the proximal phalanx of the thumb.
  • Actions: Extends at the metacarpophalangeal and carpometacarpal joints of the thumb.
  • Innervation: Radial nerve (posterior interosseous branch).

Extensor pollicis longus
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Diepe spier posterior compartiment onderarm.

The extensor pollicis longus muscle has a larger muscle belly than the EPB. Its tendon travels medially to the dorsal tubercle at the wrist, using the tubercle as a ‘pulley’ to increase the force exerted.
The tendon of the extensor pollicis longus forms the medial border of the anatomical snuffbox in the hand.
  • Attachments: Originates from the posterior surface of the ulna and interosseous membrane. It attaches to the distal phalanx of the thumb.
  • Actions: Extends all joints of the thumb: carpometacarpal, metacarpophalangeal and interphalangeal.
  • Innervation: Radial nerve (posterior interosseous branch).

Extensor indicis proprius
Behoort tot welk compartiment?
Aanhechting, functie, innervatie?

Diepe spier posterior compartiment onderarm.

This muscle allows the index finger to be independent of the other fingers during extension.
  • Attachments: Originates from the posterior surface of the ulna and interosseous membrane, distal to the extensor pollicis longus. Attaches to the extensor hood of the index finger.
  • Actions: Extends the index finger.
  • Innervation: Radial nerve (posterior interosseous branch).

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