1Trapizius: Origin
–medial 1/3 of the superior nuchal line
–external occipital protuberance (EOP)
–ligamentum nuchae–spinous process (SPs) of C7–T12
2What is the primary action of the Brachioradialis?
Elbow flexion and rotation of the forearm to the mid-prone position
3What nerve innervates the Brachioradialis?
Radial nerve (C5-8)
4What is the primary action of the Extensor Carpi Radialis Longus (ECRL)?
Extension and radial deviation (abduction) at the radiocarpal and midcarpal joints
5What nerve innervates the Extensor Carpi Radialis Longus (ECRL)?
Radial nerve (C5-8)
6What is the primary action of the Extensor Carpi Radialis Brevis (ECRB)?
Extension and radial deviation at the radiocarpal and midcarpal joints
7What nerve innervates the Extensor Carpi Radialis Brevis (ECRB)?
Deep branch of the radial nerve (C6-8)
8What is the primary action of the Extensor Digitorum (ED)?
Extension at the MCP and IP joints of digits 2-5 and assisting wrist extension
9What nerve innervates the Extensor Digitorum (ED)?
Posterior interosseous nerve (PIN), a branch of the radial nerve (C6-8)
10What is the primary action of the Extensor Carpi Ulnaris (ECU)?
Extension and ulnar deviation (adduction) of the wrist
11What nerve innervates the Extensor Carpi Ulnaris (ECU)?
Posterior interosseous nerve, a branch of the radial nerve (C6-8)
12What is the primary action of the Supinator?
Supination of the forearm
13What nerve innervates the Supinator?
Deep branch of the radial nerve (C6-8)
14What is the primary action of the Pronator Teres (PT)?
Pronation at the radioulnar joints and assisting in elbow flexion
15What nerve innervates the Pronator Teres (PT)?
Median nerve (C6-7)
16What is the primary action of the Flexor Carpi Radialis (FCR)?
Flexion and radial deviation at the radiocarpal and midcarpal joints
17What nerve innervates the Flexor Carpi Radialis (FCR)?
Median nerve (C6-7)
18What is the primary action of the Flexor Carpi Ulnaris (FCU)?
Flexion and ulnar deviation at the radiocarpal and midcarpal joints
19What nerve innervates the Flexor Carpi Ulnaris (FCU)?
Ulnar nerve (C8, T1)
20What is the primary action of the Flexor Digitorum Superficialis (FDS)?
Flexion at the MCP and PIP joints of digits 2-5
21What nerve innervates the Flexor Digitorum Superficialis (FDS)?
Median nerve (C6-7)
22What is the primary action of the Flexor Pollicis Longus (FPL)?
Flexion at the MCP and IP joints of the thumb
23What nerve innervates the Flexor Pollicis Longus (FPL)?
Anterior interosseous nerve (C7-C8-T1)
24What is the primary action of the Pronator Quadratus (PQ)?
Pronation of the forearm and binding the radius and ulna together
25What nerve innervates the Pronator Quadratus (PQ)?
Anterior interosseous nerve (C7-C8-T1)
26What is the primary action of the Biceps Brachii?
Flexion at the humeroulnar joint and supination at the radioulnar joints
27What nerve innervates the Biceps Brachii?
Musculocutaneous nerve (C5-7)
28What is the primary action of the Brachialis?
Flexion at the humeroulnar joint
29What nerve innervates the Brachialis?
Musculocutaneous nerve (C5-7)
30What is the primary action of the Triceps Brachii?
Extension of the ulna at the humeroulnar joint
31What nerve innervates the Triceps Brachii?
Radial nerve (C5-8)
32What is the primary action of the Pectoralis Major?
Adduction and internal rotation of the humerus
33What nerve innervates the Pectoralis Major?
Medial and lateral pectoral nerves
34What is the primary action of the Serratus Anterior?
Protraction and upward rotation of the scapula
35What nerve innervates the Serratus Anterior?
Long thoracic nerve
36What is the primary action of the Deltoid?
Abduction, flexion, and extension of the humerus depending on fiber orientation
37What nerve innervates the Deltoid?
Axillary nerve
38What is the primary action of the Supraspinatus?
Abduction of the humerus and dynamic stabilization of the glenohumeral joint
39What nerve innervates the Supraspinatus?
Suprascapular nerve
40What is the primary action of the Infraspinatus?
External rotation of the humerus
41What nerve innervates the Infraspinatus?
Suprascapular nerve
42What is the primary action of the Subscapularis?
Internal rotation of the humerus and dynamic stabilization of the glenohumeral joint
43What nerve innervates the Subscapularis?
Upper and lower subscapular nerves
44What is the primary action of the Trapezius?
Elevation, depression, retraction, and upward rotation of the scapula
45What nerve innervates the Trapezius?
Spinal Accessory Nerve (CN XI)
46What is the primary action of the Latissimus Dorsi?
Extension, adduction, and internal rotation of the humerus
47What nerve innervates the Latissimus Dorsi?
Thoracodorsal nerve