Muscles of the Arm Flashcards
Innervation of the anconeus muscle
radial nerve
C7-8
Attachments of anconeus
lateral epicondyle of the humerus–> lateral surface of the olecranon process of the ulna
Actions of the anconeus
elbow extension
Innervation of the biceps brachii
musculocutaneous nerve
C5-6
Attachments of the biceps brachii
(short head) from the coracoid process and (long head) supraglenoid tubercle of the scapula to the radial tuberosity and the deep antebrachial fascia (through the bicipital aponeurosis)
Actions of the biceps brachii
flexion of the shoulder and elbow, and SUPINATION of forearm
Innervation of the brachialis
musculocutaneous and small branch from radial nerve
C5-6
Attachments of the brachialis
Distal anterior shaft of the humerus and lateral and medial inter muscular septa–> coronoid process and ulnar tuberosity
Actions of the brachialis
flexion of the elbow
Innervation of the coracobrachialis
musculocutaneous nerve (C6-7)
Attachments of the coracobrachialis
from the coracoid process–> proximal medial shaft of the humerus
Actions of the coracobrachialis
flexion and adduction of the shoulder
does not cross elbow joint
Innervation of the triceps brachii
radial nerve
C6-T1
Attachments of the triceps brachii
infraglenoid tubercle of the scapula (long head) proximal posteriolateral (lateral head) and distal posteromedial (medial) shaft of humerus–> olecranon process of the ulna
Actions of the triceps brachii
extension of shoulder- long head
extension of elbow- long, lateral, medial heads
