MSK - Anterior forearm muscles Flashcards
Name the muscles of the superficial compartment of the anterior forearm (4)
- Pronator teres
- Flexor carpi radialis
- Palmaris longus
- Flexor carpi ulnaris
What is the origin of pronator teres?
- Medial epicondyle
- Coronoid process of the ulna
Where does pronator teres insert?
Laterally to the mid-shaft of the radius
What is the innervation of pronator teres?
Median nerve (C6 and C7)
What are the actions of pronator teres?
- Pronation of the forearm
- Weak flexion of the forearm at the elbow
What is the origin of flexor carpi radialis?
Medial epicondyle
Where does flexor carpi radialis insert?
Base of metacarpals 2 and 3
What is the innervation of flexor carpi radialis?
Median nerve (C6, C7)
What are the actions of flexor carpi radialis?
- Flexion of the wrist
- Radial deviation at the wrist
What is the origin of palmaris longus?
Medial epicondyle
Where does palmaris longus insert?
- Flexor retinaculum of the wrist
- Palmar aponeurosis
What is the innervation of palmaris longus?
Median nerve (C7, C8)
What are the actions of palmaris longus?
- Flexion of the hand at the wrist
- Tenses palmar aponeurosis
What is the origin of flexor carpi ulnaris?
- Medial epicondyle
Where does flexor carpi ulnaris insert?
- Pisiform carpal bone
What is the innervation of flexor carpi ulnaris?
- Ulnar nerve (C8, T1)
What are the actions of flexor carpi ulnaris?
- Flexion of the hand at the wrist
- Ulnar deviation (adduction)
Name the muscle of the intermediate compartment of the forearm
Flexor digitorum superficialis
What is the origin of flexor digitorum superficialis?
- One head originates from medial epicondyle
- One head originates from the radius
Where does flexor digitorum superficialis insert?
- Splits into four tendons
- Inserts at middle phalanges of digits 2-5 (four fingers)
What is the innervation of flexor digitorum superficialis?
Median nerve (C7, C8, T1)
What are the actions of flexor digitorum superficialis?
- Flexion of metacarpopharangeal joints
- Flexion of proximal interphalangeal joints
- Flexion of the hand at the wrist
Name the THREE muscles of the deep compartment of the forearm
- Flexor digitorum profundus
- Flexor pollicus longus
- Pronator quadratus
What is the origin of flexor digitorum profundus?
- Upper 3/4 of anteriomedial ulna
- And surrounding interosseous membrane
