Anatomy 1 - Arm muscles

Question 1

Origin of deltoid (clavicular, acromial, spinal heads)?

Answer 1

• Lateral third of clavicle
• Acromion
• Spine of scapula

Question 2

Insertion of deltoid (clavicular, acromial, spinal heads)?

Answer 2

Deltoid tuberosity of humerus

Question 3

Function of deltoid (clavicular, acromial, spinal heads)?

Answer 3

• Clavicular head:
  F, IR, horizontal adduction arm at shoulder joint
• Acromial head: ABd arm at shoulder joint
• Spinal head:
  E, ER, horizontal abduction arm at shoulder joint

Question 4

Origin of coracobrachialis?

Answer 4

Coracoid process of scapula

Question 5

Insertion of coracobrachialis?

Answer 5

Medial surface of humeral shaft

Question 6

Function of coracobrachialis?

Answer 6

ADD, F, horizontal ADD arm at shoulder joint

+ stabilises shoulder/glenohumeral joint

Question 7

Origin of brachialis?

Answer 7

Anterior distal half of humerus

Question 8

Insertion of brachialis?

Answer 8

• Ulnar tuberosity
• Anterior surface of coronoid process of ulna

Question 9

Function of brachialis?

Answer 9

Flexion of forearm at elbow joint

Question 10

Origin biceps brachii (short/long head)?

Answer 10

• Long head:
  Supraglenoid tubercle of scapula
• Short head:
  Apex of coracoid process of scapula

Question 11

Insertion biceps brachii (short/long head)?

Answer 11

• Radial tuberosity
• Deep fascia of forearm

Question 12

Function biceps brachii (short/long head)?

Answer 12

• F, supination of forearm at elbow joint
• F at shoulder joint

Question 13

Origin triceps brachii (long, medial, and lateral head)?

Answer 13

• Long head:
  Infraglenoid tuberosity of scapula
• Medial head:
  Posterior surface of the humerus (inferior to radial groove)
• Lateral head:
  Posterior surface of humerus
  (superior to radial groove)

Question 14

Insertion triceps brachii (long, medial, and lateral head)?

Answer 14

• Olecranon of ulna
• Fascia of forearm

Question 15

Function triceps brachii (long, medial, and lateral head)?

Answer 15

• E of forearm at elbow joint
• E, ADD of arm at shoulder joint (long head)

Question 16

Origin pronator quadratus?

Answer 16

Distal anterior surface of ulna

Question 17

Insertion pronator quadratus?

Answer 17

Distal anterior surface of radius

Question 18

Function pronator quadratus?

Answer 18

Pronation of forearm at proximal radioulnar joint

Question 19

Origin flexor pollicis longus?

Answer 19

• Anterior surface of the radius
• Interosseous membrane

Question 20

Insertion flexor pollicis longus?

Answer 20

Palmar surface of distal phalanx of digit 1 (thumb, pollex)

Question 21

Function of flexor pollicis longus?

Answer 21

Flexion of distal phallanx of digit 1 at metacarpophangeal and interphalangeal joint 1

Question 22

Origin flexor digitorum profundus?

Answer 22

• Proximal half of anterior medial surfaces of ulna
• Interosseous membrane

Question 23

Insertion flexor digitorum profundus?

Answer 23

Base of palmar surfaces of distal phalanges of digits 2-5

Question 24

Function flexor digitorum profundus?

Answer 24

• F of middle and proximal phalanges of digits 2-5 at metacarpophalangeal and interphalangeal joints
• F of hand at wrist joint

(same as flexor digitorum superficialis)

Question 25

Origin of flexor digitorum superficialis?

Answer 25

- Medial epicondyle of humerus - Coronoid process of ulna - Proximal half of anterior border of radius (inferior to radial tuberosity)

Question 26

Insertion flexor digitorum superficialis?

Answer 26

Middle phalanges of digits 2-5

Question 27

Function of flexor digitorum superficialis?

Answer 27

- Flexion of middle and proximal phalanges of digits 2-5 at metacarpophalangeal and interphalangeal joints - F of hand at wrist joint (same as flexor digitorum profundus)

Question 28

Origin flexor carpi radialis?

Answer 28

Medial epicondyle of humerus (like palmaris longus)

Question 29

Insertion flexor carpi radialis?

Answer 29

Base of metacarpals 2 and 3

Question 30

Function flexor carpi radialis?

Answer 30

- F, ABd (radial) of hand at wrist joint - Pronation of forearm at elbow joint

Question 31

Origin flexor carpi ulnaris?

Answer 31

- Medial epicondyle of humerus - Olecranon of ulna

Question 32

Insertion flexor carpi ulnaris?

Answer 32

- Pisiform - Hamate - Base of metacarpal 5

Question 33

Function flexor carpi ulnaris?

Answer 33

F, ADD (ulnar deviation) of hand at wrist joint

Question 34

Origin palmaris longus?

Answer 34

Medial epicondyle of humerus (like palmaris longus)

Question 35

Insertion palmaris longus?

Answer 35

- Flexor retinaculum - Palmar aponeurosis

Question 36

Function palmaris longus?

Answer 36

- F of hand at wrist joint - Tenses palmar aponeurosis