The Anterior Compartment of the Forearm Flashcards
the muscles of the anterior compartment of the forearm facilitate which movements?
- flexion of the wrist and digits
- pronation of the forearm at the radio-ulnar joint
which superficial flexor forearm muscle is absent in about 20% of people?
palmaris longus
what is the action of the pronator teres?
pronation
apart from flexing the wrist, wich superficial muscle is involved in adduction (ulnar deviation) of the wrist joint?
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 anterior compartment of the forearm are supplied by the blank nerve (C5-T1) with the blank nerve (C8-T1) supplying the flexor carpi ulnaris muscle.
Three superficial muscles are supplied by median nerve (C5-T1) with the ulnar nerve (C8-T1) suppling the flexor carpi ulnaris muscle.
what is the anatomical location of the flexor digitorum superficialis (FDS)?
- 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.
the flexor digitorum superficialis has an extensive origin in the forearm, and passes distally down the arm giving rise to how many tendons?
4 tendons
to which digits (fingers) are the tendons of the flexor digitorum superficialis (FDS) attached?
2-5 digits (no thumb)
on which phalanx are the 4 tendons of the flexor digitorum superficialis (FDS) inserted?
middle phalanges of digits 2-5
the flexor digitorum superficialis (FDS) flexes which joints?
- wrist joint
- metacaropophalangeal joints
- proximal interphalangeal joints
can the flexor digitorum superficialis (FDS) act on the distal interphalangeal joint?
no (FDP) acts on distal
what nerve innervates the flexor digitorum superficialis (FDS)?
median nerve C5-T1
what is the main action of the brachioradialis muscle?
flexion of the elbow
which nerve innervates the brachioradialis muscle?
radial nerve
which muscle is the exception to the rule that all flexors lie in the anterior compartments of the forearm, and that the radial nerve only innervates extensor muscles?
brachioradialis
label the 3 deep muscles of the anterior forearm
all the flexor muscles acting on the wrist and the fingers originate from?
medial epicondyle of humerus
all of the extensor muscles acting on the wrist and fingers originate from?
the lateral epicondyle of the humerus
describe the flexor digitorum profundus (FDP)
Flexor Digitorum Profundus (FDP)
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.
what is the main action of the FDP on the wrist and finger joints?
- flexion of wrist
- flexion of finger joints (metacarpophalangeal, distal interphalangeal)
what is the nerve supply of the FDP?
dual nerve supply:
- medial half supplied by the ulnar nerve
- lateral half is supplied by the median nerve
waht does pollicis mean?
thumb
what does brevis mean?
short
what does profundus mean?
deep
what does quadratus mean?
square/rectangular
The flexor pollicis longus (FPL) is the long flexor of the thumb. Which nerve innervates this muscle?
median nerve
what is the origin and insertion of the pronator quadratus?
Lies deeply in the distal part of the forearm, taking origin from the front of the ulna, and passing across to be inserted into the radius.
what is the innervation of the pronator quadratus?
median nerve
what is the action of the pronator quadratus?
Pronator Quadratus works in synergy with the pronator teres muscle and form a powerful pair of pronators at both the proximal and distal radioulnar joints.
