Anterior Arm/Forearm Muscles Flashcards
Brachialis
Origin
-Distal half of anterior surface of humerus
Brachialis
Insertion
-Coronoid process and tuberosity of the ulna
Brachialis
Innervation
-Musculocutaneous nerve (C5, C6) and radial nerve (C7)
Brachialis
Action
-Flexes elbow in all positions
Biceps Brachii Short Head
Origin
-coracoid process of scapula
Biceps Brachii Long Head
Origin
-supraglenoid tubercle of scapula
Biceps Brachii
Insertion
- Radial tuberosity
- fascia of forearm via bicipital aponeurosis
Biceps Brachii
Innervatioin
-Musculocutaneous nerve (C5, C6)
Biceps Brachii
Action
- Supinates forearm & flexes elbow
- Resists dislocation of glenohumeral joint
Pronator Teres Ulnar Hear
Origin
-coronoid process of ulna.
Pronator Teres
Insertion
-Lateral surface of radius.
Pronator Teres
Innervation
-Median nerve (C6, C7)
Pronator Teres
Action
-Pronates forearm and
flexes elbow
Pronator Teres Humeral Head
medial epicondyle of humerus (via common flexor tendon)
Flexor Carpi Redialis (FCR)
Origin
-Medial epicondyle of humerus (via common
flexor tendon)
Flexor Carpi Redialis (FCR)
Insertion
-Base of 2nd metacarpal
Flexor Carpi Redialis (FCR)
Innervation
-Median nerve (C6, C7)
Flexor Carpi Redialis (FCR)
Action
- Flexes & radially deviates wrist
- Weakly flexes elbow
Palmaris Longus
Origin
-Medial epicondyle of humerus (via common
flexor tendon)
Palmaris Longus
Insertion
-Flexor retinaculum and palmar aponeurosis.
Palmaris Longus
Innervation
-Median nerve (C7, C8)
Palmaris Longus
Action
- Tenses palmar aponeurosis
- Flexes wrist, weakly flexes elbow
Flexor Carpi Ulnaris (FCU) Humeral Head
Origin
-medial epicondyle of humerus (via common flexor tendon)
Flexor Carpi Ulnaris (FCU) Ulnar Head
Origin
-olecranon andposterior border of ulna
Flexor Carpi Ulnaris (FCU)
Insertion
-Pisiform; hook of hamate; 5th metacarpal
Flexor Carpi Ulnaris (FCU)
Innervation
-Ulnar nerve (C7, C8)
Flexor Carpi Ulnaris (FCU)
Action
- Flexes & ulnarly deviates wrist.
- Weakly flexes elbow
Flexor Digitorum Superficialis (FDS) Huumeroulnar Head
Origin
-medial epicondyle (via common flexor tendon) & coronoid process of ulna
Flexor Digitorum Superficialis (FDS) Radial Head
Origin
-anterior proximal radius
Flexor Digitorum Superficialis (FDS)
Insertion
-Shafts of middle phalanges of 2nd-5th digits.
Flexor Digitorum Superficialis (FDS)
Innervation
-Median nerve (C7, C8, T1)
Flexor Digitorum Superficialis (FDS)
Action
- Flexes PIP & MCP joints for 2nd – 5th digits
- Flexes wrist
- Weakly flexes elbow
Flexor Digitorum Profundus (FDP)
Origin
-Proximal medial and anterior ulna; interosseous membrane.
Flexor Digitorum Profundus (FDP)
Insertion
-Base of distal phalanges of 2nd-5th digits.
Flexor Digitorum Profundus (FDP)
Innervation
-Medial part: Ulnar nerve (C8, T1)
-Lateral part: anterior interosseous nerve, from
median nerve (C8, T1)
Flexor Digitorum Profundus (FDP)
Action
- Flexes DIP, PIP & MCP joints for 2nd – 5th digits
- Flexes wrist
Flexor Pollicis Longus (FPL)
Origin
- Anterior surface of radius
- interosseous membrane
Flexor Pollicis Longus (FPL)
Insertion
-Base of distal phalanx of the thumb
Flexor Pollicis Longus (FPL)
Innervation
-Anterior interosseous nerve, from median nerve (C8, T1)
Flexor Pollicis Longus (FPL)
Action
- Flexes IP & MCP of 1st digit (thumb)
- Flexes wrist
Pronator Quadratus
Origin
-Distal anterior ulna
Pronator Quadratus
Insertion
-Distal anterior radius
Pronator Quadratus
Innervation
-Anterior interosseous nerve, from median nerve (C8, T1)
Pronator Quadratus
Action
- Pronates forearm
- Stabilizes distal radioulnar joint