Muscle Actions, Origins and Insertions

Question 1

Coracobrachialis:

1. Action
2. Origin
3. Insertion

Answer 1

1. flex arm
2. coracoid process
3. mid shaft of humerus

Question 2

Brachialis:

1. action
2. origin
3. insertion

Answer 2

1. flex elbow
2. distal humerus
3. ulna

Question 3

Biceps Brachii:

1. action
2. origin
3. insertion

Answer 3

1. flex and supinate arm at shoulder
2. long head - supraglenoid tubercle
   short head - coracoid process
3. radial tuberosity

Question 4

Triceps Brachii:

1. action
2. origin
3. insertion

Answer 4

1. extension of forearm
2. long head - infraglenoid tubercle of scapula
   medial head - posterior surface of humerus
   short head - lateral surface of humerus

Question 5

Trapezius

1. action
2. origin
3. insertion

Answer 5

1. elevation of scapula. Abduction of arm
2. axial skeleton
3. spine of scapula, acromion, clavicle

Question 6

Deltoid

1. Action
2. Origin
3. Insertion

Answer 6

1. abduction, flexion and extension
2. spine of scapula, acromion and clavicle
3. Humerus

Question 7

Origin of Levator Scapulae

Answer 7

C1-C5

Question 8

Origin of Rhombid Major

Answer 8

T2-T5

Question 9

Origin of Rhomboid Minor

Answer 9

C8-T1

Question 10

Action of Supraspinatus

Answer 10

Abduction

Question 11

Action of Infraspinatus

Answer 11

Lateral Rotation

Question 12

Action of Teres Minor

Answer 12

Lateral Rotation

Question 13

Action of Subscapularis

Answer 13

Medial Rotation

Extension

Question 14

Name 4 structures that pass through the carpal tunnel

Answer 14

• FDP tendon
• FDS tendon
• FPL tendon
• median nerve

Question 15

Where does the FCU insert?

Answer 15

pisiform and base of metacarpal V

Question 16

Where does the FCR insert?

Answer 16

base of metacarpals II and III

Question 17

Pronator Teres

1. Origin
2. Insertion

Answer 17

1. medial epicondyle and coronoid process of ulna

2. lateral midshaft of radius

Question 18

Origin of FDP?

Answer 18

Ulna and Interosseous Membrane

Question 19

Origin of flexor policis longus

Answer 19

radius and interosseous membrane

Question 20

Aconeus

1. action
2. origin
3. insertion

Answer 20

1. abduction of forearm in pronation
2. lateral epicondyle
3. olecranon and ulna

Question 21

Supinator

1. Origin
2. Insertion

Answer 21

1. lateral epicondyle and ulna

2. radius

Question 22

Piriformis

1. Origin
2. Insertion
3. Action

Answer 22

1. sacrum
2. greater trochanter
3. lateral rotation and abduction

Question 23

Obturator Internus

1. Origin
2. Insertion
3. Action

Answer 23

1. pubis and ischium
2. greater trochanter
3. lateral rotation and abduction

Question 24

Gemellus Superior

1. Origin
2. Insertion
3. Action

Answer 24

1. ischial spine
2. greater trochanter
3. lateral rotation and abduction

Question 25

Gemellus Inferior

1. Origin
2. Insertion
3. Action

Answer 25

1. Ischial tuberosity
2. greater trochanter
3. lateral rotation and abduction

Question 26

Quadratus Femoris

1. Origin
2. Insertion
3. Action

Answer 26

1. ischium
2. intertrochanteric crest
3. lateral rotation

Question 27

Insertion of gluteus maximus and medius

Answer 27

greater trochanter

Question 28

Insertion of the iliopsoas

Answer 28

lesser trochanter

Question 29

Sartorius

1. Origin
2. Insertion
3. Action

Answer 29

1. iliac spine
2. medial tibia
3. flex hip and knee

Question 30

Rectus Femoris

1. Origin
2. Insertion
3. Action

Answer 30

1. inferior iliac spine
2. quadriceps tendon
3. extend knee; flex hip

Question 31

Semitendinosus

1. Origin
2. Insertion
3. Action

Answer 31

1. ischial tuberosity
2. tibia
3. flex knee
   extend thigh

Question 32

Semimembranosus

1. Origin
2. Insertion
3. Action

Answer 32

1. ischial tuberosity
2. tibia
3. flexion of knee; extend thigh

Question 33

Vastus Medialis

1. Origin
2. Insertion
3. Action

Answer 33

1. intertrochanteric line
2. quadriceps tendon
3. extend knee

Question 34

Vastus Lateralis

1. Origin
2. Insertion
3. Action

Answer 34

1. greater trochanter
2. quadriceps tendon
3. extend knee

Question 35

Vastus Intermedialis

1. Origin
2. Insertion
3. Action

Answer 35

1. femoral shaft
2. quadriceps tendon
3. extend knee