24: UE Myology: Antebrachium

Question 1

Pronator teres O and I (two heads)

Answer 1

Humeral head O: medial humeral epicondyle
Ulnar head O: coronoid process of ulna
I: lateral radius

Question 2

Pronator teres A

Answer 2

Pronate, flex forearm

Question 3

Innervation for superficial layer of flexors

Answer 3

Medial N for all except flexor carpi ulnaris (ulnar N)

Question 4

Flexor carpi radialis O and I

Answer 4

O: medial humeral epicondyle
I: base of 2nd metacarpal

Question 5

Flexor carpi radialis A

Answer 5

Flex forearm, flex and abduct hand at wrist

Question 6

Palmaris longus O and I

Answer 6

O: medial humeral epicondyle
I: palmar aponeurosis, flexor retinaculum

Question 7

Palmaris longus A

Answer 7

Flex forearm, flex hand, tense palmar aponeurosis

Question 8

Flexor carpi ulnaris O and I (two heads)

Answer 8

Humeral head O: medial humeral epicondyle
Ulnar head O: olecranon, posterior ulna
I: pisiform, hook of hamate, base of 5th metacarpal

Question 9

Flexor carpi ulnaris A

Answer 9

Flex forearm, flex and adduct hand at wrist

Question 10

Flexor digitorum superficialis O and I (two heads)

Answer 10

Humeroulnar head O: medial humeral epicondyle, coronoid of ulna
Radial head: superoanterior radius
I: bifed insertion on intermediate phalanges 2-5

Question 11

Flexor digitorum superficialis A

Answer 11

Flex forearm, flex hand at wrist, flex phalanges 2-5 at MP and PIP joints

Question 12

Flexor digitorum superficialis N

Answer 12

Median N

Question 13

Flexor digitorum profundus O and I

Answer 13

O: proximal ulna, interosseous membrane
I: distal phalanges 2-5

Question 14

Flexor digitorum profundus A

Answer 14

Flex hand at wrist, flex phalanges 2-5 at MP, PIP, and DIP joints

Question 15

Innnervation for deep layer of flexors (with one exception)

Answer 15

All innervated by anterior interosseous N, but medial part of flexor digitorum profundus also innervated by Ulnar N

Question 16

Flexor pollicis longus O and I

Answer 16

O: anterior radius, interosseous membrane
I: distal phalanx of pollux

Question 17

Flexor pollicis longus A

Answer 17

Flex hand, flex and abduct 1st phalange

Question 18

Pronator quadratus O and I

Answer 18

O: anterior distal ulna
I: anterior distal radius

Question 19

Pronator quadratus A

Answer 19

Pronate forearm, hold radius and ulna together

Question 20

Three nerves that innervate the superfiial layer of extensors

Answer 20

Radial N, deep radial N, posterior interosseous N

Question 21

Brachioradialis O and I

Answer 21

O: lateral humeral supracondylar ridge
I: lateral distal radius

Question 22

Brachioradialis A

Answer 22

Flex forearm

Question 23

Brachioradialis N

Answer 23

Radial N

Question 24

Extensor carpi radialis longus O and I

Answer 24

O; lateral humeral supracondylar ridge

I: 2nd metacarpal

Question 25

Extensor carpi radialis longus A

Answer 25

Extend, abduct hand at wrist

Question 26

Extensor carpi radialis longus N

Answer 26

Radial N

Question 27

Extensor carpi radialis brevis O and I

Answer 27

O: lateral humeral epicondyle I: base of 3rd metacarpal

Question 28

Extensor carpi radialis brevis A

Answer 28

Extend, abduct hand at wrist

Question 29

Extensor carpi radialis brevis N

Answer 29

Deep radial N

Question 30

Extensor digitorum O and I

Answer 30

O: lateral humeral epicondyle I: extensor expansion of digits 2-5

Question 31

Extensor digitorum A

Answer 31

Extend hand at wrist, extend all phalanges 2-5 at all joints

Question 32

Extensor digitorum N

Answer 32

Posterior interosseous N

Question 33

Extensor digiti minimi O and I

Answer 33

O: lateral humeral epicondyle I: extensor expansion digit 5

Question 34

Extensor digit minimi A

Answer 34

Extend all joints of digit 5

Question 35

Extensor digiti minimi N

Answer 35

Posterior interosseous N

Question 36

Extensor carpi ulnaris O and I

Answer 36

O: lateral humeral epicondyle I: 5th metacarpal

Question 37

Extensor carpi ulnaris A

Answer 37

Extend and adduct hand at wrist

Question 38

Extensor carpi ulnaris N

Answer 38

Posterior interosseous N

Question 39

Lateral and medial epicondylitis: other names

Answer 39

Lateral: tennis elbow Medial: golfer’s elbow

Question 40

What causes lateral epicondylitis

Answer 40

Repetitive use of superficial extensors of the antebrachium OR repeated flexion and extension of the wrist -> either way, strain on the lateral humeral epicondyle

Question 41

Supinator O and I

Answer 41

O; lateral humeral epicondyle, radial collateral L, annular L, supinator crest of ulna I: proximal radius

Question 42

Supinator N

Answer 42

Deep radial N

Question 43

Extensor Indicis O and I

Answer 43

O: posterior distal ulna, interosseous membrane | I; extensor expansion of 2nd phalanx

Question 44

Extensor indicis A

Answer 44

Extend hand at wrist, extend 2nd digit

Question 45

Extensor indicis N

Answer 45

Posterior interosseous N

Question 46

Abductor pollicis longus O and I

Answer 46

O: posterior proximal ulna, radius, interosseous membrane I: 1st metacarpal

Question 47

Abductor pollicis longus A

Answer 47

Abduct hand at wrist, abduct Pollux

Question 48

Innervation to outcropping muscles of the deep layer of extensors

Answer 48

Posterior interosseous N

Question 49

Extensor pollicis longus O and I

Answer 49

O: posterior ulna, interosseous membrane I: dorsal distal phalanx of Pollux

Question 50

Extensor pollicis longus A

Answer 50

Abduct hand at wrist, extend all phalanges of 1st digit

Question 51

Extensor pollicis brevis O and I

Answer 51

O: posterior radius, interosseous membrane I: proximal phalanx of pollux

Question 52

Extensor pollicis brevis A

Answer 52

Abduct hand, extend 1st digit