Flexors of the forearm Flashcards
(12 cards)
Which muscles form the superficial layer of the flexors in the forearm?
Pronator teres;
flexor carpi radialis;
palmaris longus;
flexor carpi ulnaris.
Which nerve innervates most of the superficial flexor muscles of the forearm?
The median nerve innervates pronator teres; flexor carpi radialis; and palmaris longus; while the flexor carpi ulnaris is innervated by the ulnar nerve.
What are the primary actions of the superficial flexor muscles of the forearm?
They pronate the forearm and flex the wrist.
What is the function of the palmaris longus muscle?
It tightens the palmar aponeurosis to facilitate gripping.
Which muscle forms the intermediate layer of the anterior forearm flexors?
Flexor digitorum superficialis (FDS) muscle.
Which nerve innervates the flexor digitorum superficialis?
Median nerve.
What are the main actions of the flexor digitorum superficialis?
Flexion of the wrist and flexion of digits 2 to 5 at the metacarpophalangeal (MP) and proximal interphalangeal (PIP) joints.
Which muscles form the deep layer of the anterior forearm flexors?
Pronator quadratus; flexor digitorum profundus; and flexor pollicis longus.
Which nerve supplies the deep flexor muscles of the anterior forearm?
The anterior interosseous nerve (a branch of the median nerve) supplies pronator quadratus and flexor pollicis longus; flexor digitorum profundus is supplied by the anterior interosseous nerve for its lateral half and by the ulnar nerve for its medial half.
What is the main action of the pronator quadratus muscle?
It pronates the forearm and stabilizes the distal radioulnar joint.
What is the function of the flexor digitorum profundus?
It flexes the wrist and digits 2 to 5 at the metacarpophalangeal; proximal interphalangeal; and distal interphalangeal joints.
What is the main action of the flexor pollicis longus?
It flexes the thumb at the interphalangeal joint and assists in wrist flexion.
