Arm Muscles for Practical 3

identify + state origin, insertion, action, innervation of marked structure

Deltoid m.

O: clavicle (anterior), scapular spine (posterior), acromion process (lateral/middle)

I: Deltoid tuberosity of humerus

A: Anterior part: Flexes arm (shoulder) and medially rotates arm (shoulder)
Middle part: Abducts arm (shoulder)
Posterior part: Extends arm (shoulder) and laterally rotates arm (shoulder)

Inn: Axillary n.

identify + state origin, insertion, action, innervation of marked structure

supraspinatus m.

O: Supraspinous fossa of scapula

I: Greater tubercle of humerus

A: Abducts arm (shoulder)

Inn: Suprascapular n.

identify + state origin, insertion, action, innervation of marked structure

infraspinatus m.

O: Infraspinous fossa of scapula

I: Greater tubercle of humerus

A: Laterally rotates arm (shoulder)

Inn: Suprascapular n.

identify + state origin, insertion, action, innervation of marked structure

teres minor m.

O: posterolateral scapula

I: Greater tubercle of humerus

A: Laterally rotates arm (shoulder)

Inn: Axillary n.

identify + state origin, insertion, action, innervation of marked structure

teres major m.

O: inferior angle of scapula

I: intertubecular groove/sulcus of humerus

A: shoulder extension and medial rotation

Inn: subscapular n.

identify + state origin, insertion, action, innervation of marked structure

subscapularis m.

O: Subscapular fossa
I: Lesser tubercle of humerus
A: medial rotation of arm
Inn: subscapular n.

identify + state origin, insertion, action, innervation of marked structure

latissimus dorsi m.

O: T7-L5, lower ribs, iliac crest, thoracolumbar fascia
I: intertubercular sulcus/groove of humerus
A: Shoulder extension, shoulder ADDuction and medial rotation
Inn: Thoracodorsal nerve (C6-8) aka middle scapular nerve

identify + state origin, insertion, action, innervation of marked structure

pectoralis major m.

O: clavicle, sternum and ribs 1-7

I: Intertubecular sulcus of humerus

A: Adducts arm (shoulder), Medially rotates arm (shoulder), and Flexes arm (shoulder)

Inn: Medial pectoral n., Lateral pectoral n.

identify + state origin, insertion, action, innervation of marked structure

pectoralis minor m.

O: Anterior surface of ribs 3-5

I: Coracoid process of scapula

A: scapular abduction, downward rotation of the scapula, depression of scapula

Inn: Medial pectoral n., Lateral pectoral n.

identify + state origin, insertion, action, innervation of marked structure

Coracobrachialis m.

O: Coracoid process of scapula

I: Middle of Medial humerus

A: Flexes arm (shoulder), Medially rotates arm (shoulder)

Inn: Musculocutaneous n.

identify + state origin, insertion, action, innervation of marked structure

biceps brachii m. (long)

O: superior glenoid fossa
I: radial tuberosity
A: elbow flexion, supinator
Inn: musculocutaneous n.

identify + state origin, insertion, action, innervation of marked structure

biceps brachii m. (short)

O: coracoid process
I: radial tuberosity
A: elbow flexion, supinator
Inn: musculocutaneous n.

identify + state origin, insertion, action, innervation of marked structure

brachialis m.

O: anterior distal humerus
I: Coronoid process of the ulna
A: elbow flexion
N: Musculocutaneous n. and radial n.

identify + state origin, insertion, action, innervation of marked structure

triceps brachii m. (long)

O: Inferior glenoid fossa
I: Olecranon process of ulna
A: Extends elbow and adduction of humerus
N: Radial n.

identify + state origin, insertion, action, innervation of marked structure

triceps brachii m. (lateral)

O: posterior proximal humerus
I: Olecranon process of ulna
A: Extends elbow and adduction of humerus
N: Radial n.

identify + state origin, insertion, action, innervation of marked structure

triceps brachii m. (medial)

O: posterior humerus
I: Olecranon process of ulna
A: Extends elbow and adduction of humerus
N: Radial n.

identify + state origin, insertion, action, innervation of marked structure

Anconeus m.

Origin: Lateral Epicondyle

Insertion: Olecranon process

Action: Extension of Elbow

Innervation: Radial Nerve

identify + state origin, insertion, action, innervation of marked structure

pronator teres m.

Origin: medial epicondyle of humerus
Insertion: lateral radius
Action: pronation and very weak elbow flexion
Inn: Median n.

identify + state origin, insertion, action, innervation of marked structure

flexor carpi radialis m.

O: Medial epicondyle of humerus
I: Base of 2nd and 3rd metacarpals
A: Flexes wrist, radial deviation
Inn: Median n.

identify + state origin, insertion, action, innervation of marked structure

flexor digitorum superficialis m.

O: medial epicondyle (humerus), UCL, ulnar coronoid process
I: middle phalange of digits 2-5
A: flex digits at MCP and IP
Inn: median n.

identify + state origin, insertion, action, innervation of marked structure

flexor carpi ulnaris m.

O: medial epicondyle of humerus
I: 5th metacarpal, hamate and pisifiorm
A: flexion at wrist and ulnar deviation
Inn: ulnar n.

identify + state origin, insertion, action, innervation of marked structure

flexor digitorum profundus m.

O: proximal ulna and interosseous membrane
I: Base of distal phalanges of fingers 2-5
A: wrist flexion, MCP + IP + DIP flexion
Inn: medial n. and ulnar n.

identify + state origin, insertion, action, innervation of marked structure

flexor pollicis longus m.

O: Radius and interosseous membrane
I: Base of distal phalanx of thumb (digit 1)
A: Flexes thumb at MCP and IP
Inn: Median n.

identify + state origin, insertion, action, innervation of marked structure

Pronator quadratus m.

O: Anterior surface of distal ulna
I: Anterior surface of distal radius
A: Pronates forearm
Inn: Median n.

identify + state origin, insertion, action, innervation of marked structure

Brachioradialis m.

O: Lateral supracondylar ridge of humerus
I: styloid process of radius
A: elbow flexion
Inn: Radial n.
-"The drinking muscle"

identify + state origin, insertion, action, innervation of marked structure

extensor carpi radialis longus m.

Origin:  lateral supracondylar ridge of the humerus
Insertion: base of metacarpal 2
Action: wrist extension and radial deviation/radial flexion
Inn: radial n.

identify + state origin, insertion, action, innervation of marked structure

palmaris longus m.

O: medial epicondyle of humerus
I: palmar aponeurosis and flexor retinaculum 
A: flexion at wrist, anchoring skin and fascia to the palmar region, resist shearing forces when the overlying skin is stressed
Inn: median n.

identify + state origin, insertion, action, innervation of marked structure

extensor carpi radialis brevis m.

Origin: lateral epicondyle of humerus
Insertion: base of 3rd metacarpal
Action: Wrist extension and radial deviation
Inn: radial n.

identify + state origin, insertion, action, innervation of marked structure

extensor digitorum m.

O: lateral epicondyle (humerus)
I: dorsal surface of digits 2-5
A: wrist, MCP, IP extension
Inn: radial n.

identify + state origin, insertion, action, innervation of marked structure

extensor carpi ulnaris m.

O: Lateral epicondyle of humerus
I: Base of 5th metacarpal
A: wrist extension and ulnar deviation
Inn: radial n.
-One of the most powerful extensor muscles at the wrist

identify + state origin, insertion, action, innervation of marked structure

extensor pollicis longus m.

O: Posterior ulna and interosseous membrane
I: Distal phalanx of digit 1
A: extends MCP and IP of digit 1, adducts and laterally rotates the thumb
Inn: radial n.
-passes through 3rd tunnel and around dorsal tubercle of the radius making a pulley to extend the thumb

identify + state origin, insertion, action, innervation of marked structure

extensor pollicis brevis m.

O: shaft of radius and interosseous membrane
I: Base of proximal phalanx of thumb (digit 1)
A: Extend thumb at the MCP and IP joints
Inn: radial n.
-runs with the abductor pollicis longus through the first tunnel deep to the extensor retinaculum

identify + state origin, insertion, action, innervation of marked structure

extensor indicis m.

O: Posterior surface of ulna and interosseous membrane
I: Middle and distal phalanges of index finger (digit 2)
A: Extends index finger and wrist
Inn: radial n.

identify + state origin, insertion, action, innervation of marked structure

abductor pollicis longus m.

O: Interosseous membrane and middle posterior surfaces of radius and ulna
I: Base of 1st metacarpal and trapezium
A: Abducts AND adducts thumb
Inn: radial n.

what joint is this?

glenohumeral ll.

what structure is this?

glenoid labrum

what ligament is this?

acromioclavicular l.

what ligament is this?

coracoclavicular l.

what ligament is this?

radial collateral l.

what ligament is this?

ulnar collateral l.

what ligament is this?

anular l.

what muscle do the marked images represent?

deltoid m.

what muscle does the marked image represent?

teres major m.

what muscle does the marked image represent?

subscapularis m.

what muscle do the marked images represent?

latissimus dorsi m.

what muscle do the marked images represent?

pectoralis major m.

what muscle do the marked images represent?

pectoralis minor m.

what muscle does the marked image represent?

biceps brachii m.

what muscle does the marked image represent?

brachialis m.

what muscle do the marked images represent?

triceps brachii m. (top left = lateral, top right = long)

what muscle do the marked images represent?

brachioradialis m.

what muscle does the marked image represent?

flexor carpi ulnaris m.

what muscle do the marked images represent?

extensor carpi ulnaris m.

what muscle does the marked image represent?

extensor pollicis brevis m.

what muscle does the marked image represent?

extensor digitorum m.