Anterior Forearm Flashcards
How many muscles are there in the anterior forearm?
8
superficial = 4
intermediate = 1
deep = 3
what is the main action of the anterior compartment?
flexion at wrists and fingers
pronation
where is the common flexor origin?
medial epicondyle of the humerus
where does the flexor carpi ulnaris attach?
common flexor origin + additional head from ulna.
pisiform bone
what is the action and innervation of the flexor carpi ulnaris?
flexion and adduction at wrist
ulnar nerve
where does palmaris longus attach?
common flexor origin
flexor retinaculum
what is the function of the flexor retinaculum?
prevents “bowstringing” - holds the tendons down.
what is the action and innervation of palmaris longus?
flexion at wrist
median nerve
where does the flexor carpi radialis attach?
common flexor origin
bases of metacarpals II and III
what is the action and innervation of flexor carpi radialis?
flexion and abduction at wrist
median nerve
what border of the cubital fossa does the pronator teres contribute to?
medial border
where does the pronator teres attach?
common flexor origin
mid-shaft of radius
what is the action and innervation of pronator teres?
pronation of forearm
median nerve
name the 4 superficial muscles of the anterior compartment of the forearm
flexor carpi ulnaris, flexor carpi radialis, palmaris longus, pronator teres
name the muscle that lies in the intermediate layer of the anterior compartment of the forearm
flexor digitorum superficialis
which two important structures pass between the 2 heads of the flexor digitorum superficialis?
median nerve and ulnar artery
where does the flexor digitorum superficialis attach?
one head from common flexor origin, and one from radius
middle phalanges of the 4 fingers
what is the action and innervation of flexor digitorum superficialis?
flexes at MCP and proximal IP joints of the 4 fingers
flexes at wrist
median nerve
name the 3 muscles in the deep layer of the anterior compartment of the forearm?
flexor digitorum profundus, flexor pollicis longus, pronator quadratus
what are the attachments of flexor digitorum profundus?
ulna + interosseous membrane
distal phalanges of the 4 fingers
what is the action of flexor digitorum profundus?
only muscle to flex distal IP joints
also flexes at MCP joints and wrist
what is the innervation of flexor digitorum profundus?
medial two fingers = ulnar nerve
lateral two fingers = median nerve
what are the attachments of flexor pollicis longus?
radius
distal phalanx of thumb
what is the action and innervation of flexor pollicis longus?
flexes IP + MCP joints of thumb
median nerve
what are the attachments of pronator quadratus?
ulna to radius
what is the action and innervation of pronator quadratus?
pronates forearm
median nerve
which 2 nerves supply the anterior compartment of the forearm?
median and ulnar
