Arm Muscles

Question 0

Brachialis

Answer 0

Origin: Lower half anterior surface humerus Inter muscular septa

Insertion: Ulnar tuberosity

Actions: Flexion arm

Innervation: Musculocutaneous (C5, C6)

Lateral side may receive radial n

Question 1

Coracobrachialis

Answer 1

Origin: Coracoid process

Insertion: Anteromedial surface midshaft humerus

Actions: Flex arm

Adduct arm

Innervation: Musculocutaneous (C5-C7)

Question 2

Biceps brachii

Answer 2

Origin: Short head- tip coracoid process

Long head- supraglenoid tubercle

Insertion: Radial tuberosity; Bicipital aponeurosis into fascia forearm

Actions: Flexion arm, Flexion forearm Supination arm

Innervation: Musculocutaneous (C5,C6)

Question 3

Anconeus

Answer 3

Origin: Lateral epicondyle of humerus

Insertion: Lateral side olecranon of ulna

Actions: Extension forearm

Stabilize elbow joint against flexion or supination/ pronation

Innervation: Radial nerve (C7,C8)

Question 4

Triceps brachii

Answer 4

Origin: Long head- infraglenoid tubercle

Lateral head- posterior surface humerus above lateral groove medial nerve and lateral inter muscular septa

Medial head-posterior surface humerus below medial groove radial nerve and both intermuscular septa

Insertion: Lateral side olecranon of ulna

Actions: Extension forearm

Innervation: Radial nerve (C7,C8)

Question 5

Coracobrachialis: Origin

Answer 5

Coracoid process of scapula

Question 6

Coracobrachialis: Insertion

Answer 6

Anteromedial surfaces midshaft humerus

Question 7

Coracobrachialis: Actions

Answer 7

Flex arm

adduct arm

Question 8

Coracobrachialis: Innervation

Answer 8

Musculocutaneous (C5-C7)

Question 9

Biceps Brachii: Origin

Answer 9

Short head: tip coracoid process

Long head: Supraglenoid tubercle scapula

Question 10

Biceps brachii: Insertion

Answer 10

Radial tuberosity

Bicipital aponeurosis into facia forearm

Question 11

Biceps brachii: Actions

Answer 11

Flexion arm

Flexion forearm

Supination forearm

Question 12

Biceps brachii: Innervation

Answer 12

Musculocutaneous (C5, C6)

Question 13

**Brachialis: Origin **

Answer 13

Lower 1/2 anterior surface humerus intermuscular septa

Question 14

Brachialis: Insertion

Answer 14

Ulnar tuberosity

Question 15

Brachialis: Actions

Answer 15

Flexion arm

Question 16

Brachialis: Innervation

Answer 16

Musculocutaneous (C5,C6)

Lateral side may recieve radian

Question 17

Triceps brochii: Origin

Answer 17

Long head- infraglenoid tubercle

Lateral head- Posterior surface humerus above and lateral groove radial nerve and lateral intermuscular septum

Medial head- Posterior surface humerus below medial to groove of radial nerve and both intermuscular septum

Question 18

Triceps brachii: Insertion

Answer 18

Proximal end of oleranon of ulna

Question 19

**Triceps brachii: Actions **

Answer 19

Extension forearm

Extension arm (long head)

Question 20

Triceps brachii: Innervation

Answer 20

Radial nerve (C6-C8)

Question 21

Anconeus: Origin

Answer 21

Lateral epicondyle of humerus

Question 22

Anconeus: Insertion

Answer 22

Lateral side of olecranon of ulna

Question 23

Anconeus: Actions

Answer 23

Extension forearm

stabilize elbow joint against flexion or prontation-supination

Question 24

Anconeus: Innervation

Answer 24

Radial nerve (C7,C8)