Arm Muscles

Question 1

Biceps Brachii Origin and Insertion

Answer 1

Origin: Coracoid process of the scapula, tubercle above glenoid cavity on the humerus
Insertion: radial tuberosity of the radius

Question 2

Biceps Brachii Isolated and Integrated Functions

Answer 2

Isolated Function: concentrically accelerates elbow flexion, supination of the radioulnar joint, and shoulder extension
Integrated Function: eccentrically decelerates elbow extension, pronation of the radioulnar joint, shoulder extension, isometrically stabilizes the elbow and shoulder girdle

Question 3

Triceps Brachii Origin and Insertion

Answer 3

Origin: Infraglenoid tubercle of the scapula, posterior humerus
Insertion: olecranon process of the ulna

Question 4

Triceps Brachii Isolated and Integrated Functions

Answer 4

Isolated Function: concentrically accelerates elbow extension and shoulder extension
Integrated Function: eccentrically decelerates elbow flexion and shoulder flexion, isometrically stabilizes the elbow and shoulder girdle

Question 5

Brachioradialis Origin and Insertion

Answer 5

Origin: Lateral supracondylar ridge of the humerus
Insertion: lateral surface of the distal radius, immediately above styloid process

Question 6

Brachioradialis Isolated and Integrated Functions

Answer 6

Isolated Function: concentrically accelerates elbow flexion

Integrated Function: eccentrically decelerates elbow extension, isometrically stabilizes the elbow

Question 7

Brachialis Origin and Insertion

Answer 7

Origin: lower 1/2 of the anterior surface of the humerus
Insertion: tuberosity and coronoid process of the ulna

Question 8

Brachialis Isolated and Integrated Functions

Answer 8

Isolated Function: concentrically accelerates elbow flexion

Integrated Function: eccentrically decelerates elbow extension, isometrically stabilizes the elbow