Muscles

Question 1

Anterior deltoid

Answer 1

Action: shoulder flexion, IR
Origin: anterior lateral clavicle
Insertion: deltoid tuberosity of humerus
Nerve: axillary, C5/6

Question 2

Middle deltoid

Answer 2

Action: abduction
Origin: acromion, spine of scapula
Insertion: deltoid tuberosity
Nerve: axillary, C5/6

Question 3

Posterior deltoid

Answer 3

Action: extension, ER
Origin: spine of scapula
Insertion: deltoid tuberosity
Nerve: axillary, C5/6

Question 4

Pectoralis major

Answer 4

Action: adducts, IR
             Claviclar head: flexes arm
             Sternal head: extends arm
Origin: clavicular- middle clavicle 
             Sternal- sternum
Insertion: bicipital groove of humerus 
Nerve: clavicular- lateral pectoral, C5,6,7
             Sternal- medial pectoral C8,T1

Question 5

Biceps

Answer 5

Action: weak shoulder flexor, flexes forearm, supinates
Origin: short head- coracoid process
Long head- Supraglenoid tubercle of scapula
Insertion: radial groove
Nerve: musculocutaneous, C5,6,7

Question 6

Coracobrachialis

Answer 6

Action: flexes shoulder, adducts
Origin: coracoid process
Insertion: middle medial humerus
Nerve: musculocutaneous, C5,6,7

Question 7

Subscapularis

Answer 7

Action: IR
Origin: subscapular fossa
Insertion: lesser tubercle of humerus
Nerve: subscapularis, C5,6,7

Question 8

Teres major

Answer 8

Action: adducts, extends, IR
Origin: inferior angle of Scapula
Insertion: bicipital groove
Nerve: subscapularis, C5,6,7

Question 9

Lattisimus Dorsi

Answer 9

Action: extends, IR, adducts
Origin: spinous processes T7-L5, inferior angle of Scapula, lower ribs
Insertion: bicipital groove
Nerve: thoracodorsal, C6,7,8

Question 10

Supraspinatus

Answer 10

Action: Abduction
Origin: supraspinous fossa
Insertion: greater tubercle
Nerve: suprascapular C5,6

Question 11

Infraspinatus

Answer 11

Action: ER
Origin: infraspinous fossa
Insertion: greater tubercle
Nerve: suprascapular C5,6

Question 12

Teres minor

Answer 12

Action: ER, addiction
Origin: lateral border of scapula
Insertion: greater tubercle
Nerve: axillary C5,6

Question 13

Triceps

Answer 13

Action: extends
Origin: long head- infraglenoid tubercle of scapula
Medial- inferior posterior humerus
Lateral- proximal posterior humerus
Insertion: long head- olecranon process
Medial- olecranon process
Lateral- olecranon process
Nerve: radial C7,8

Question 14

Serratus anterior

Answer 14

Action: protraction, upward rotation
Origin: anterior surface of ribs 1-9
Insertion: anterior surface of medial border of scapula
Nerve: long thoracic C5-7

Question 15

Pectoralis minor

Answer 15

Action: downward rotation, protraction
Origin: anterior ribs 3-5 (sternal end)
Insertion: coracoid process
Nerve: medial pectoral nerve C8-T1

Question 16

Levator scapulae

Answer 16

Action: elevates scapula
Origin: transverse process of C1-4
Insertion: superior angle of scapula
Nerve: dorsal scapular nerve C5

Question 17

Trapezius

Answer 17

Action: shoulder elevation, upward and downward rotation, retraction
Origin: Nuchal line, external occipital protuberance, ligamentum nuchae, spinous processes of C7-T12
Insertion: lateral clavicle, acromion, spine of scapula
Nerve: spinal accessory nerve, C3,4

Question 18

Rhomboids

Answer 18

Action: retracts
Origin: spinous processes of T2-T5
Insertion: medial border of scapula
Nerve: dorsal scapular C5

Question 19

Brachialis

Answer 19

Action: flexes forearm
Origin: distal half of humerus
Insertion: coranoid process and ulnar tuberosity
Nerve: musculocutaneous C5,6

Question 20

Brachioradialis

Answer 20

Action: flexes
Origin: lateral Supracondylar ridge of humerus
Insertion: radial styloid process
Nerve: radial C5,6

Question 21

Pronator teres

Answer 21

Action: pronates and flexes
Origin: medial epicondyle of humerus
Insertion: middle lateral radius
Nerve: median C6,7

Question 22

Anconeous

Answer 22

Action: extends
Origin: lateral epicondyle
Insertion: posterior olecranon
Nerve: radial C7,8

Question 23

Flexor Carpi radialis

Answer 23

Action: flexes, RD
Origin: medial epicondyle
Insertion: bases of 2nd and 3rd metacarpals
Nerve: median C6,7

Question 24

Palmaris longus

Answer 24

Action: flexes hand and wrist
Origin: medial epicondyle
Insertion: flexor retinaculum, palmar aponeurosis
Nerve: median C7,8

Question 25

Flexor carpi ulnaris

Answer 25

Action: flexion, UD
Origin: medial epicondyle
Insertion: pisiform, hook of hamate, 5th metacarpal
Nerve: ulnar C8,T1

Question 26

Flexor carpi digitorum superficialis

Answer 26

Action: flexes middle phalanges
Origin: medial epicondyle and coronoid process
Insertion: middle phalanges 2-5
Nerve: median C7,8,T1

Question 27

Extensor carpi radialis longus

Answer 27

Action: extends, RD
Origin: lateral supracondylar ridge
Insertion: base of 2nd metacarpal
Nerve: radial C6,7

Question 28

Extensor carpi radialis brevis

Answer 28

Action: extends, RD
Origin: lateral epicondyle
Insertion: base of 3rd metacarpal
Nerve: radial C6,7

Question 29

Extensor digitorum

Answer 29

Action: extends wrist and fingers
Origin: lateral epicondyle
Insertion: distal phalanges of 2-5
Nerve: deep branch of radial nerve C6,8

Question 30

Extensor carpi ulnaris

Answer 30

Action: extends, UD
Origin: lateral epicondyle
Insertion: base of 5th metacarpal
Nerve: radial C6-8