The Anterior Compartment of the Forearm Flashcards
(33 cards)
What does the medial epicondyle act as?
The common flexor origin for the superficial and intermediate flexors.
A common tendon arises from here, providing the proximal insertion point for these 4 muscles.
Any overuse injury (such as golfers elbow) is reflected by pain here.
What is the palmaris longus?
The palmaris longus (not shown above) is a muscle which is absent in about 20% of people! It is a long thin muscle and is one of the most superficial structures found at the wrist joint – see if you have one by flexing the wrist joint
What is the action of pronator teres?
It pronates the forearm turning the hand posteriorly
Apart from flexing the wrist, which superficial muscle is involved in adduction (ulnar deviation) of the wrist joint?
Flexor carpi ulnaris and flexor carpi ulnaris
Apart from flexing the wrist, which superficial muscle is involved in abduction (radial deviation) of the wrist joint?
Flexor carpi radialis
Three superficial muscles of the forearm are supplied by what?
Flexor carpi ulnaris muscle
What is the flexor digitorum superficialis?
Lies immediately deep to the superficial group of flexors in the forearm and is seen as the only muscle on the intermediate group of the forearm
Explain the distal tendon of FDS
When approaching its insertion point it splits into two loops passing around the back of the phalanx.
This provides a tunnel in which the flexor digitorum profundus tendon can pass through attaching onto the distal phalanx.
To which digits (fingers) are the 4 tendons of FDS attached?
Eeveryone but thumb
On which phalanx are they inserted?
Middle phalanx
What does the flexor digitorum superficialis flex?
Flexes the wrist, metacarpophalangeal and proximal interphalangeal joints.
Can this muscle act on the distal interphalangeal joint?
Metacarpophalangeal and prxomal interpahalangeal finger flexion
What nerve innervates FDS?
Median nerve (C8-T1)
What does the brachioradialis act on?
Although seen as a muscle that lies in the posterior (extensor) compartment of the forearm the brachioradialis acts on the elbow joint with the other anterior muscles.
What is the main action of the brachioradialis muscle?
Flexes elbow when forearm is in neutral and acts to stabolise the elbow during rapid flexion and extension
Which nerve innervates the brachioradialis muscle?
Radial nerve (C5, C6, C7
What rule is the brachioradialis exception to?
The rule that all flexors lie in the anterior compartment, and that the radial nerve only innervates extensor muscles
What are the deep group of muscles of the forearm in contact with?
The bones and interosseous membrane.
The flexor digitorum profundus (FDP) is in relation to the ulna, the flexor pollicis longus in in relation to the radius, and the pronator quadratus which is closely related to the distal parts of both bones.
The flexor digitorum profundus (FDP) is in relation to what?
The flexor pollicis longus is in relation to what?
The pronator quadratus is in relation to what?
Flexor digitorum profundus- Ulna
Flexor pollicis longus- Radius
Pronator quadratus- Closely related to the distal parts of both bones
What is the flexor digitorum profundus?
FDP is a long, thick muscle that lies deeply in the front of the forearm. It also lies more superficially on the medial border and back of the forearm.
The fleshy mass at the medial side is the FDP covered with the aponeurosis of what?
The fleshy mass at the medial side is the FDP covered with the aponeurosis of flexor carpi ulnaris
What is its main action of FDP on the wrist and finger joints?
Finger flexion
