Muscle Origins, Insertions, and Innervations: ARM

Question 1

Origin and Insertion of Brachialis

Answer 1

Origin: Anterior distal half of the humerus
Insertion: Ulnar Tuberosity and anterior surface of coronoid process

Question 2

Innervation and Action of Brachialis

Answer 2

Innervation: Musculocutaneous nerve and a branch of radial nerve
Action: Flexes the forearm at the elbow

Question 3

Origin and Insertion of Bicep Long Head

Answer 3

Origin: Supraglenoid tubercle of the scapula
Insertion: Radial Tuberosity and bicipital aponeurosis

Question 4

Innervation and Action of Bicep Long Head

Answer 4

Innervation: Musculocutaneous nerve
Action: Flexes and supinates elbow

Question 5

Origin and Insertion of Bicep Short Head

Answer 5

Origin: Coracoid Process of scapula
Insertion: Radial Tuberosity

Question 6

Innervation and Action of Bicep Short Head

Answer 6

Innervation: Musculocutaneous nerve
Action: Flexes and supinates elbow

Question 7

Origin and Insertion of Triceps Lateral Head

Answer 7

Origin: Posterior surface of the body of the humerus
Insertion: Olecranon of Ulna

Question 8

Innervation and Action of Triceps Lateral Head

Answer 8

Innervation: Radial nerve
Action: Extends forearm at elbow

Question 9

Origin and Insertion of Triceps Medial Head

Answer 9

Origin: Posterior surface of the body of humerus
Insertion: Olecranon of Ulna

Question 10

Innervation and Action of Triceps Medial Head

Answer 10

Innervation: Radial nerve
Action: Extends forearm at elbow

Question 11

Origin and Insertion of Triceps Long Head

Answer 11

Origin: Infraglenoid Tuberosity
Insertion: Olecranon of Ulna

Question 12

Innervation and Action of Triceps Long Head

Answer 12

Innervation: Radial nerve
Action: Extension of the elbow; adduction of shoulder

Question 13

Origin and Insertion of Coracobrachialis

Answer 13

Origin: Coracoid process of scapula
Insertion: Medial surface and border of body of humerus

Question 13

Innervation and Action Coracobrachialis

Answer 13

Innervation: Musculocutaneous nerve
Action: Adduction and flexion of humerus

Question 14

Origin and Insertion of Deltoid Clavicular Head

Answer 14

Origin: Lateral third of clavicle
Insertion: Deltoid tuberosity of the lateral side of the body of humerus

Question 15

Innervation and Action of Deltoid Clavicular Head

Answer 15

Innervation: Axillary nerve
Action: Flexion and medial rotation of humerus

Question 16

Origin and Insertion of Deltoid Acromial Head

Answer 16

Origin: Acromion
Insertion: Deltoid tuberosity of the lateral side of the body of humerus

Question 17

Innervation and Action of Deltoid Acromial Head

Answer 17

Innervation: Axillary nerve
Action: Abduction of humerus

Question 18

Origin and Insertion of Deltoid Spinal Head

Answer 18

Origin: Scapular Spine
Insertion: Deltoid tuberosity of the lateral side of the body of humerus

Question 19

Innervation and Action of Deltoid Spinal Head

Answer 19

Innervation: Axillary nerve
Action: Extension and lateral rotation of humerus