The Forearm - muscles Flashcards
brachioradialis (posterior / radial group)
Ridge superior to lat. epicondyle on the humerus , lateral inter muscular septum to base of styloid process of radius
Inn ; Radial nerve (C05, C06)
Action ; elbow flexor
NB> Causes supination
Flexes elbow when arm is in pronation “reverse grip curls”. When elbow is pronated, the biceps brachii is NOT the flexor.
ext. carpi radialis longus (posterior / radial group)
from lower 1/3 of the lateral supracondylar ridge of humerus to dorsal surface of the base of the 2nd metacarpal bone.
Inn ; radial nerve (C06, C07)
Action; EXTENSION and abduction of the wrist
ext. carpi radialis brevis (posterior / radial group)
lateral epicondyle of the humerus to the dorsal base of the 3rd metacarpal bone
Inn ; radial nerve (C06, C07)
Action; EXTENSION and abduction of the wrist
extensor digitorum
?
extensor digiti minimi
?
extensor carpi ulnaris
?
Superficial extensor muscles
posterior compartment
- brachioradialis “reverse grip curls”
- ext. carpi radialis longus
- ext carpi radialis brevis
- ext. digitorum
- extensor digiti minimi
- ext. carpi ulnaris
Ventral muscles - superficial layer
Pronator teres Flexor digitorum superficialis Flexor carpi radialis Flexor carpi ulnaris Palmaris longus
Pronator teres
medial epicondyle and the coronoid process of ulna to pronator tuberosity of the radius (lateral surface of radius).
In.: Median nerve
Actions : pronates and flexes forearm
Flexor digitorum superficialis
(underneath the flexor carpi radialis & palmaris longus)
medial epicondyle, coronoid process, radial tuberosity> with split tendons to centre of the middle phalanges of fingers 2- 5. In.: Median nerve
Flexor carpi radialis
Medial epicondyle humerus to base of 2nd and 3rd metacarpals In.: Median nerve
Action - flexion and abduction of the hand
Flexor carpi ulnaris
medial epicondyle & olecranon of ulna to Pisiform (seismoid) bone, hook of the hamate, base of metacarpal V. Inn : Ulnar nerve (C8, Th1)
Palmaris longus
Medial epicondyle humerus to palmar aponeurosis, flexor retinaculum. In.: Median nerve
(just lateral to flexor carpi radialis)
Forearm FLEXOR compartment or Anterior compartment
flexor carpi radialis palmaris longus flexor carpi ulnaris (ULNAR nerve) pronator teres flexor digitorum superficialis flexor digitorum profundus flexor pollicis longus pronator quadratus
Flexor muscles originating from the medial epicondyle
pronator teres flexor carpi radialis palmaris longus flexor digitorum superficialis flexor carpi ulnaris
DEEP Anterior/ Flexor compartment muscles (3)
flexor digitorum profundus
flexor pollicis longus
pronator quadratus
Flexor Digitorum Profundus
proximal aspect of ulnar bone to distal phalanges 2-5
Inn : interosseous branch of the median and ulnar nerves
Action : Flexes wrist , flexes distal phalanx for digits 2-5
Flexor Pollicis Longus
radius and interosseous membrane to thumb distal phalanx
Inn: interosseous branch of the median nerve
Action : flexes distal phalanx of the thumb
Pronator Quadratus
Distal anterior surface of ulna to radius
Inn : interosseous branch of the medial nerve
Action : pronates the hand
SUPERFICIAL flexor muscles of the Anterior compartment
pronator teres flexor carpi radialis palmaris longus flexor digitorum superficialis flexor carpi ulnaris
Posterior/ Dorsal/ Radial group of muscles
Brachioradialis
Extensor carpi radialis longus
Extensor carpi radialis brevis
LOAF
lumbricals
opponens pollicis
abductor pollicis brevis
flexor pollicis brevis
Opponens pollicis (3 origins, 1 insertion)
origins ;
flexor retinaculum
scaphoid bone
trapezium bone
insertion ; lateral border of metacarpal I
Abductor Pollicis Brevis
origins ;
flexor retinaculum
scaphoid bone
trapezium bone
insertion; radial base of proximal phalanx I
Flexor Pollicis Brevis
superficial head origins ;
flexor retinaculum
trapezium bone
deep head origins
trapezoid none
capitate bone
insertion; radial base of proximal phalanx I
