Thoracic Limb Muscles

Question 1

Lateral stabilizers of the shoulder:

Answer 1

Supraspinatus, Infraspinatus, teres minor

Question 2

Medial stabilizers:

Answer 2

Subscapularis

Question 3

Shoulder flexors:

Answer 3

teres major, deltoideus

Question 4

Shoulder extensors

Answer 4

Supraspinatous, biceps brachii

Question 5

A: supraspinatus

Answer 5

supraspinous fossa - greater and lesser tubercles

Question 6

N, F: supraspinatus

Answer 6

Suprascapular
lat stabilizes and extends shoulder

Question 7

A: infraspinatus

Answer 7

infraspinatus fossa - greater tubercle

Question 8

N, F: infraspinatus

Answer 8

suprascapulr
lat stabilizes shoulder

Question 9

A: teres minor

Answer 9

distal ½ of caudal scapula - proximal deltoid tuberosity

Question 10

N, F: teres minor

Answer 10

Axillary
lat stabilizes shoulder (minor)

Question 11

A: subscapularis

Answer 11

subscapular fossa - lesser tubercle of humerus

Question 12

N, F: subscapularis

Answer 12

subscapular nerve
medially stabilizes shoulder

Question 13

A: teres major

Answer 13

caidal border of scapula - teres major tuberosity

Question 14

N, F: teres major

Answer 14

axillary nerve
flexes shoulder

Question 15

A: Deltoideus

Answer 15

scapular spine and caudal border of scap - deltoid tuberosity

Question 16

N, F: deltoideus

Answer 16

Axillary
flex shoulders

Question 17

A: biceps brachii

Answer 17

supraglenoid tubercle - proximal radius
Lacertus fibrosus attaches to ECR as part of passive stay apparatus

Question 18

N, F: biceps brachii

Answer 18

Musculocutaneous
extends shoulder, flexes elbow

Question 19

Who innervates the elbow flexors

Answer 19

musculocutaneous nerve

Question 20

Who innervates elbow extensors

Answer 20

radial nerve

Question 21

Who are the elbow flexors

Answer 21

Biceps brachii
Brachialis

Question 22

Who are the elbow extensors

Answer 22

triceps brachii (long, lateral, medial, anconeus)

Question 23

A: brachialis

Answer 23

proximal/caudal humerus - prox radius

Question 24

N, F: brachialis

Answer 24

musculocutaneous
flexes elbow

Question 25

A: triceps brachii

Answer 25

long: caudal border of scap - olecrannon
lat, medial, anconeus: proximal humerus - olecrannon

Question 26

N, F: triceps brachii

Answer 26

radial
extends elbow

Question 27

proximal attachment for carpus & digit extensors

Answer 27

lateral epicondyle of the humerus

Question 28

Proximal attachment for carpus & digit flexors

Answer 28

Medial epicondyle of the humerus

Question 29

Extensors of the carpus & digit (list from cranial to lateral):

Answer 29

extensor carpi radialis
common digital extensor
lateral digital extensor
extensor carpi ulnaris – FLEXES the carpus !!!

Question 30

Who innervates the carpus/digit extensors

Answer 30

Radial nerve

Question 31

Who innervates the carpus/digit flexors

Answer 31

median and ulnar nerve
median - DDF, flexor carpi radialis
ulnar - DDF, SDF, flexor carpi ulnaris

Question 32

DA: extensor carpi radialis

Answer 32

Proximal dorsal MC III

Question 33

What muscle of the flexor/extensors has a name that doesn’t match its function

Answer 33

extensor carpi ulnaris – it FLEXES the carpus

Question 34

DA: common digital extensor

Answer 34

PI (with LDE), PII, PIII

Question 35

DA: lateral digital extensor

Answer 35

PI (with CDE)

Question 36

DA: extensor carpi ulnaris

Answer 36

long tendon to proximal MCIV, short tendon to accessory bone
remember this muscle flexes the carpus

Question 37

Flexors of the carpus and digits:

Answer 37

Flexor carpi ulnaris
Superficial digital flexor
Deep digital flexor
flexor carpi radialis

Question 38

DA: flexor carpi ulnaris

Answer 38

accessory carpal bone

Question 39

DA: superficial digital flexor

Answer 39

PI and PII

Question 40

DA: deep digital flexor

Answer 40

PIII

Question 41

DA: flexor carpi radialis

Answer 41

proximal MCII