Arm mm

Question 1

Anconeus m

Answer 1

attachments- from lateral epicondyle of humerus to lateral surface of the olecranon process

actions- extension of the elbow

innervation- radial nerve

Common spinal cord segment: (C7-8)

Question 2

Biceps Brachii m

Answer 2

attachments- from coracoid process (short head) & supraglenoid tubercle (long head) of the scapula to the radial tuberosity & the deep antebrachial fascia (through the bicipital aponeurosis)

actions- flexion of the shoulder & elbow, & supination of the forearm

innervation- musculocutaneous nerve

Common spinal cord segment: (C5-6)

Question 3

Brachialis m

Answer 3

attachments- from the distal anterior shaft of the humerus & lateral & medial intermuscular septa to the coronoid process & ulnar tuberosity

actions- flexion of the elbow

innervation- musculocutaneous & small branch from radial nerve

Common spinal cord segment: (C5-6)

Question 4

Coracobrachialis m

Answer 4

attachments- from the coracoid process to the proximal medial shaft of the humerus

actions- flexion & adduction of the shoulder

innervation- musculocutaneous nerve

Common spinal cord segment: (C6-7)

Question 5

Triceps Brachii m

Answer 5

attachments- from the infraglenoid tubercle of the scapula (long head), & proximal posterolateral (lateral head) & distal posteromedial (medial) shaft of the humerus to the olecranon process of the ulna

actions- extension of the shoulder (long head) & extension of the elbow (long, lateral & medial heads)

innervation- radial nerve

Common spinal cord segment: (C6-T1)