Anatomy Muscle Actions/Origin & Insertion

Question 1

Subscapularis

Answer 1

Origin = Subscapular fossa
Insertion = Lesser tubercle of humerus
Action = Medial rotation (Shoulder)

Question 2

Infraspinatus

Answer 2

Origin = Infraspinous fossa
Insertion = Greater tubercle of humerus
Action = External rotation (Shoulder)

Question 3

Supraspinatus

Answer 3

Origin = Supraspinous fossa
Insertion = Greater tubercle of humerus
Action = Abduction

Question 4

Teres minor

Answer 4

Origin = Inferior angle of scapula
Insertion = Greater tubercle
Action = ER & Adduction

Question 5

Bicep

Answer 5

Origin: Long head = supraglenoid tubercle, coracoid process
Insertion: radial tuberosity
Action: Flexs, adducts and abducts (Shoulder) & flexes and supinates (elbow)

Question 6

Triceps

Answer 6

Origin: Long head = Infraglenoid tubercle & medial/lateral head - shaft of humerus
Insertion: Olecranon
Action: Extension of shoulder & elbow

Question 7

Anconeus

Answer 7

Origin: Lateral epicondyle
Insertion: Olecranon process
Action: Extension of elbow

Question 8

Supinator

Answer 8

Origin: Lateral epicondyle of humerus (SL - Supinator Lateral)
Insertion: Shaft of radius
Action: Supination (A)

Question 9

Pronator Teres

Answer 9

Origin: Medial epicondyle (TM - Teres Medial)
Insertion: Shaft of radius
Action: Pronation & flexion

Question 10

Pronator quadratus

Answer 10

Origin Shaft of ulna
Insertion: Shaft of radius
Action: Pronation (A)

Question 11

Flexor carpi radialis
Flexor carpi ulnaris
Flexor digitorum superficialis

Answer 11

Action: Wrist flexion
FCR: Medial epicondyle of humerus & metacarpal 2/3
FCU: Medial epicondyle & metacarpal 5
FDS: Medial epicondyle & phalanges 2-5 (And finger flexion)

Question 12

Extensor carpi radialis longus
Extensor carpi radialis brevis
Extensor carpi ulnaris
Extensor digitorum

Answer 12

ECRL: Lateral epicondyle& Metacarpal 2
ECRB: Lateral epicondyle & Metacarpal 3
ECU: Lateral epicondyle & metacarpal 5
ED: Lateral epicondyle & phalanges 2-5

Question 13

Extensor pollicus Brevis

Answer 13

Origin: Shaft of radius (close to interosseous membrane in the forearm)
Insertion: Base of the proximal phalanx of the thumb.
Action: Thumb extension

Question 14

Abductor pollicus longus

Answer 14

Origin: Shaft of ulna
Insertion: Base of first metacarpal
Action: Thumb abduction

Question 15

Hamstrings

Answer 15

All originate from ischial tuberosity
BF: Inserts lateral condyle of tibia
SM: Medial condyle of tibia
ST: Tibia via pes anserine

**Responsible for hip extension and knee flexion

Question 16

Gluteus maximus

Answer 16

O = Ilium, sacrum & coccyx
I = Illiotibial tract & shaft of femur
Action = Extension (A), abduction & ER

Question 17

Glut med & min

Answer 17

O = Illium
I = Greater trochanter
Action = Abduction & medial rotation (A)

Question 18

Piriformis

Answer 18

O = Sacrum
I = Greater trochanter
A = Abduction & Lateral rotation

Question 19

Rectus femoris

Answer 19

O = Anterior inferior iliac sine
I = tibial tuberosity
A = Hip flexion & knee extension

Question 20

Iliopsoas

Answer 20

O = Ilium, sacrum, lumbar vert
I = Lesser trochanter
A = Hip flexion

Question 21

Gastroc

Answer 21

O = medial & lateral condyles of femur
I = Calcaneus via achilles tendon
A = Knee flexion & plantarflexion