Exam 4 - Muscles & Their Actions

Question 1

A humeral propeller. Responsible for – GH extension, adduction, and internal rotation. Assists with scapular depression, retraction, and downward rotation.

(Reversal of muscle function – if the arms are stabilized, it will elevate the pelvis.)

Answer 1

Latissimus dorsi (large back muscle)

Question 2

Assists in GH joint flexion (up to 90 degrees), GH joint extension (from 180 - 90 degrees). Also GH joint/Humeral adduction, internal shoulder rotation (think arm wrestling), and horizontal adduction.

Answer 2

Pectoralis major

(i.e. - large, bouncing, chest muscle.)

Question 3

A humeral propeller. Assists latissimus dorsi in shoulder extension. Assists in adduction, internal rotation, and extension of the humerus.

Answer 3

Teres major (also called the latissimus dorsi’s “little helper”)

Question 4

The “workhorse” of elbow flexion. Assists the biceps brachii with elbow flexion. A synergist. (It is strong whether the forearm is in supination or pronation.)

Answer 4

Brachialis

Question 5

Elbow flexor. PRIMARY supinator of the radioulnar joint (forearm supination.) Also a weak shoulder flexor.

Answer 5

Biceps brachii (Let me see those pythons)

Question 6

Elbow extensor (found on the posterior side of the upper arm)

Answer 6

Triceps brachii

Question 7

Forearm pronator (mostly), also assists with elbow flexion.

Answer 7

Pronator teres

Question 8

SECONDARY supinator.

Answer 8

Supinator

Question 9

To summarize, it stabilizes and moves the scapula. it has upper, middle And lower portions

Answer 9

Trapezius

Question 10

Chiefly responsible for scapula RETRACTION. A scapular pivoter. RETRACTS and elevates the scapula. Also assists in downward ROTATION of the scapula..RRRRR

Answer 10

Rhomboids

Question 11

A scapular pivoter. Responsible for scapular protraction and upward rotation. Known as the big seeing muscle in boxing because it is the primary muscles for punching (protection). Also prevents “winging of the scapula.”

Answer 11

Serratus anterior

Question 12

A shoulder protector. (Part of the rotator cuff.)

It is responsible for INTERNAL ROTATION in unison with the lats and teres major.

Answer 12

Subscapularis

Question 13

A shoulder protector. (Part of the rotator cuff.)
main EXTERNAL ROTATOR of the shoulder and along with teres minor rotator cuff muscles to stabilize the humeral head in the glenoid fossa.

Answer 13

Infraspinatus

Question 14

Prime mover of arm abduction Along frontal plane

Answer 14

Deltoids

Question 15

Hip extension, abduction, internal and external rotation.

Answer 15

Gluteus (needed for @$*ternal rotation)

Question 16

Pulling your scapulae together

Answer 16

retraction

Question 17

Moving your leg toward midline

Answer 17

Adduction

Question 18

Moving arm away from midline

Answer 18

Horizontal abduction

Question 19

Moving your hand toward thumb side

Answer 19

Radial deviation

Question 20

Turning your foot inward

Answer 20

inversion

Question 21

Move your arm through cone shaped arc

Answer 21

circumduction

Question 22

Moving your arm across the body at shoulder level

Answer 22

horizontal adduction

Question 23

Shoulder motion during bowling back swing

Answer 23

hyperextension

Question 24

Turning your palm upward

Answer 24

supination

Question 25

Moving your arm out to the side

Answer 25

abduction

Question 26

Moving your foot outward

Answer 26

eversion

Question 27

Moving your scapulae away from midline

Answer 27

protraction

Question 28

Turning your forearm downward

Answer 28

pronation

Question 29

Moving your hand down the side of your leg

Answer 29

lateral bending

Question 30

Primary muscle involved in shoulder girdle elevation

Answer 30

upper trapezius

Question 31

Primary muscle involved in shoulder girdle depression

Answer 31

lower trapezius

Question 32

Primary muscle involved in shoulder girdle protraction

Answer 32

serratus anterior

Question 33

Primary muscle involved in shoulder girdle retraction

Answer 33

middle trapezius

Question 34

Primary muscle involved in shoulder abduction

Answer 34

middle deltoid

Question 35

Primary muscle involved in shoulder adduction

Answer 35

pectoralis major

Question 36

Primary muscle involved in shoulder flexion

Answer 36

anterior deltoid

Question 37

Primary muscle involved in shoulder extension/hyperextension

Answer 37

posterior deltoid

Question 38

Primary muscle involved in shoulder internal rotation

Answer 38

latissimus dorsi

Question 39

Primary muscle involved in shoulder external rotation

Answer 39

infraspinatus

Question 40

Primary muscle involved in elbow flexion

Answer 40

biceps brachii

Question 41

Primary muscle involved in elbow extension

Answer 41

triceps brachii

Question 42

Primary muscle involved in forearm pronation

Answer 42

pronator teres

Question 43

Primary muscle involved in forearm supination

Answer 43

biceps brachii