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XVII. Muscles of the Arm
Flexion and Extension of the Forearm
10
Anatomy
Undergraduate 2
10/09/2013

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Term
Biceps Brachii (Origin, Insertion, Innervation, and Action)
Definition
Anterior Arm; Flexion

O: Coracoid process (Short head/more medial)and Supraglenoid tubercle (long head/more lateral)
I: Radial tuberosity and bicipital aponeurosis; attachment over common flexor tendon
N: Musculotaneous nerve
A: Flexes elbow joint and supinates forearm
Term
Brachialis (Origin, Insertion, Innervation, and Action)
Definition
Anterior Arm; Flexion

O: Lower half of front of humerus
I: Coronoid process of ulna
N: Musculocutaneous nerve
A: Major forearm flexor
Term
Brachioradialis (Origin, Insertion, Innervation, and Action)
Definition
Anterior Arm; Flexion (may be considered posterior forearm

O: Lateral supracondylar ridge at distal end of humerus
I: Styloid process of radius
N: Radial nerve
A: Flexes forearm
Term
Triceps Brachii (Origin, Insertion, Innervation, and Action)
Definition
Posterior Arm; Extension

O: Infraglenoid tubercle on scapula (long head), Posterior humerus proximal to radial groove (lateral head), and Posterior humerus distal to radial groove (medial head)
I: Olecranon process of ulna
N: Radial Nerve
A: Powerful forearm extensor, long head also adducts arm and stabilizes shoulder (crosses shoulder joint)
Term
Anconeus (Origin, Insertion, Innervation, and Action)
Definition
Posterior Arm; Extension

O: Lateral epicondyle of humerus
I: Lateral aspect of olecranon process of ulna (distal to triceps I.)
N: Radial Nerve
A: Assists triceps in elbow or forearm extension
Term
Anterior Arm Muscles
Definition
Biceps Brachii, Brachialis,(both musculocutaneous nerve) and Brachioradialis (Radial Nerve);

All cross anterior elbow joint to allow flexion of forearm
Term
Posterior Arm Muscles
Definition
Triceps Brachii and Anconeus (both Radial Nerve);

All cross posterior elbow joint to allow extension of forearm
Term
Fundamental Movements of Elbow Joint: Flexion
Definition
Biceps Brachii, Brachialis, and Brachioradialis
Term
Fundamental Movements of Elbow Joint: Extension
Definition
Triceps Brachii and Anconeous
Term
Fundamental Movements of Elbow Joint: Supination
Definition
Biceps Brachii
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