Arm and Anterior Forearm Muscles

Question 1

Biceps brachii long head origin

Answer 1

Supraglenoid tubercle

Question 2

Biceps brachii short head origin

Answer 2

Coracoid process of scapula

Question 3

Biceps brachii insertion

Answer 3

Radial tuberosity; antebrachial fascia via bicipital aponeurosis

Question 4

Biceps brachii actions

Answer 4

Flexes and supinates forearm; long head weakly flexes arm; short head weakly adducts the abducted arm

Question 5

Biceps brachii innervation

Answer 5

Musculocutaneous nerve

Question 6

Coracobrachialis origin

Answer 6

Coracoid process

Question 7

Coracobrachialis insertion

Answer 7

Anterior surface of humerus midshaft

Question 8

Coracobrachialis actions

Answer 8

Flexes and adducts arm (weak)

Question 9

Coracobrachialis innervation

Answer 9

Musculocutaneous nerve

Question 10

Brachialis origin

Answer 10

Anterior surface of humeral shaft inferior to coracobrachialis

Question 11

Brachialis insertion

Answer 11

Ulnar tuberosity and coronoid process

Question 12

Brachialis actions

Answer 12

Flexes forearm

Question 13

Brachialis innervation

Answer 13

Musculocutaneous nerve

Question 14

What are the anterior compartments of the arm?

Answer 14

Biceps brachii, coracobrachialis, brachialis

Question 15

What are the posterior compartments of the arm?

Answer 15

Triceps brachii, anconeus

Question 16

All arm muscles in the anterior compartment are innervated and supplied by what?

Answer 16

Innervated by musculocutaneous nerve and supplied by branches of the brachial artery

Question 17

All arm muscles in the posterior compartment are innervated and supplied by what?

Answer 17

Innervated by radial nerve and supplied by branches of the profounda brachii artery

Question 18

Triceps brachii long head origin

Answer 18

Infraglenoid tubercle of scapula

Question 19

Triceps brachii lateral head origin

Answer 19

Posterior surface of humerus superior to spiral groove

Question 20

Triceps brachii medial head origin

Answer 20

Posterior surface of humerus inferior to spiral groove

Question 21

Triceps brachii insertion

Answer 21

Olecranon process of ulna

Question 22

Triceps brachii actions

Answer 22

Extends forearm, long head weakly extends and adducts arm

Question 23

Triceps brachii innervation

Answer 23

Radial nerve

Question 24

Anconeus origin

Answer 24

Lateral epicondyle of humerus

Question 25

Anconeus insertion

Answer 25

Lateral surface of olecranon process of ulna

Question 26

Anconeus actions

Answer 26

Weakly extends forearm and stabilizes elbow joint

Question 27

Anconeus innervation

Answer 27

Radial nerve

Question 28

What are the anterior superficial compartments of the forearm?

Answer 28

Pronator teres, flexor carpi radialis, palmaris longus, flexor carpi ulnaris, flexor digitorum superficialis

Question 29

All forearm muscles in the anterior superficial compartment are innervated and supplied by what?

Answer 29

Innervated by median nerve (except flexor carpi ulnaris) and supplied by branches of radial and ulnar arteries.

Question 30

Pronator teres origin

Answer 30

Medial epicondyle of humerus, coronoid process of ulna

Question 31

Pronator teres insertion

Answer 31

Lateral radius at midshaft

Question 32

Pronator teres actions

Answer 32

Pronates forearm

Question 33

Pronator teres innervation

Answer 33

Median nerve

Question 34

Flexor carpi radialis origin

Answer 34

Medial epicondyle of humerus

Question 35

Flexor carpi radialis insertion

Answer 35

Base of Metacarpal 2

Question 36

Flexor carpi radialis actions

Answer 36

Flexes and abducts wrist

Question 37

Flexor carpi radialis innervation

Answer 37

Median nerve

Question 38

Palmaris longus origin

Answer 38

Medial epicondyle of humerus

Question 39

Palmaris longus insertion

Answer 39

Palmar aponeurosis

Question 40

Palmaris longus actions

Answer 40

Weakly flexes wrist

Question 41

Palmaris longus innervation

Answer 41

Median nerve

Question 42

Flexor carpi ulnaris origin

Answer 42

Humeral head: medial epicondyle of humerus | Ulnar head: medial olecranon process, posterior border of ulna

Question 43

Flexor carpi ulnaris insertion

Answer 43

Pisiform bone, hook of hamate bone, and base of Metacarpal 5

Question 44

Flexor carpi ulnaris actions

Answer 44

Flexes and adducts wrist

Question 45

Flexor carpi ulnaris innervation

Answer 45

Ulnar nerve

Question 46

Flexor digitorum superficialis origin

Answer 46

Humeroulnar head: medial epicondyle, coronoid process of ulna Radial head: proximal anterior surface of radius

Question 47

Flexor digitorum superficialis insertion

Answer 47

By 4 separate tendons to bases of middle phalanges of Digits 2-5

Question 48

Flexor digitorum superficialis actions

Answer 48

Flexes proximal interphalangeal (PIP), metacarpophalangeal (MP), and wrist joints

Question 49

Flexor digitorum superficialis innervation

Answer 49

Median nerve

Question 50

What are the anterior deep compartments of the forearm?

Answer 50

Flexor digitorum profundus, Flexor pollicis longus, Pronator quadratus

Question 51

All forearm muscles in the anterior deep compartment are innervated and supplied by what?

Answer 51

Innervated by median nerve and supplied by anterior interosseous artery

Question 52

Flexor digitorum profundus origin

Answer 52

Upper three quarters of ulnar shaft and adjacent interosseous membranes

Question 53

Flexor digitorum profundus insertion

Answer 53

By 4 separate tendons to bases of distal phalanges of Digits 2-5

Question 54

Flexor digitorum profundus actions

Answer 54

Flexes distal and proximal interphalangeal (DIP & PIP) joints, MP joints, and wrist

Question 55

Flexor digitorum profundus innervation

Answer 55

``` Lateral half (Digits 2-3): median nerve Medial half (Digits 4-5): ulnar nerve ```

Question 56

Flexor pollicis longus origin

Answer 56

Anterior radial shaft and adjacent interosseous membrane

Question 57

Flexor pollicis longus insertion

Answer 57

Base of distal phalanx of thumb

Question 58

Flexor pollicis longus actions

Answer 58

Flexes IP, MP, and carpometacarpal joints of thumb; assist wrist flexion

Question 59

Flexor pollicis longus innervation

Answer 59

Median nerve

Question 60

Pronator quadratus origin

Answer 60

Lower one fourth of ulnar shaft

Question 61

Pronator quadratus insertion

Answer 61

Lower one fourth of radial shaft

Question 62

Pronator quadratus actions

Answer 62

Pronates forearm

Question 63

Pronator quadratus innervation

Answer 63

Median nerve