ALL MUSCLES + ORIGINS/INSERTIONS

Question 1

Deltoid

Answer 1

Origin:
- Lateral 1/3 half of clavicle
- Acromion spine of scapula
Insertion:
- Deltoid Tuberosity of Humerus
Action:
-Clavicular portion: flex arm at shoulder
-Medially rotates arm at shoulder
-Acromion part: Abduction of arm at shoulder beyond 15 degree

Question 2

Pectoralis Major

Answer 2

Origin:
- Anterior surface of sternum w/ upper costal cartilages
- Anterior medial half of clavicle
Insertion:
- Crest of greater tubercle of humerus
Action:
-Clavicular head: Flex arm at shoulder
-Sternum head: Extend arm at shoulder
-Both heads: Medially rotates arm at shoulder and adducts arm at shoulder

Question 3

Biceps Brachii

Answer 3

Origin:
- Supraglenoid tubercle of scapula,
- Coracoid process of scapula
Insertion:
- Radial tuberosity of radius
Action:
-Flex the arm weakly at shoulder
-Flexes forearm at elbow
-Supinates forearm at elbow

Question 4

Triceps Brachii

Answer 4

Origin:
- Infraglenoid Tubercle of Scapula
- Posterior surface of humerus (superior to radial groove)
- Posterior surface of humerus (inferior to radial groove)
Insertion:
- Olecranon process of ulna
Action:
- extension of forearm at elbow

Question 5

Brachialis

Answer 5

Origin:
- Anterior distal half of humerus
Insertion:
- Coracoid process of ulna
- Ulna tuberosity of ulna
Action:
- Flexes forearm at elbow

Question 6

Subscapularis Muscles

Answer 6

Origin:
- Subscapular fossa of scapula
Insertion:
- Lesser tubercle of humerus
Action:
- Medially rotates arm

Question 7

Supraspinatus Muscle

Answer 7

Origin:
- Supraspinatus Fossa of scapula
Insertion:
- Greater tubercle of humerus
Action:
- Abduction of arm at shoulder

Question 8

Infraspinatus Muscle

Answer 8

Origin:
- Infraspinatus fossa of scapula
Insertion:
- Middle part of greater tubercle of the humerus
Action:
- Laterally rotates the arm

Question 9

Teres Minor

Answer 9

Origin:
- Middle part of lateral axillary of the scapula
Insertion:
- Inferior aspect of the greater tubercle of the humerus
Action:
- Laterally rotates the arm at shoulder
- Weakly adducts arm

Question 9

Teres Major

Answer 9

Origin:
- Lower lateral border and inferior angle of the scapula
Insertion:
- Medial lip of the intertubercular groove of anterior humerus
Action:
- Adducts arm at shoulder
- Medially rotates arm at shoulder
- Extends arm at shoulder

Question 10

Latissimus Dorsi

Answer 10

Origin:
- Spinous processes of T7 – L5 vertebrae
- Iliac crest of sacrum
- Inferior angle of the scapula
- Lower three or four ribs
Insertion:
- Floor of intertubercular groove of humerus
Action:
- Adducts arm at shoulder
- Medially rotates arm at shoulder
- Extends arm at shoulder

Question 11

Trapezius

Answer 11

Origin:
-Nuchal line of occipital bone
-Spinous processes of vertebra
-Spinous processes of thoracic vertebra
Insertion:
-Lateral 1/3rd clavicle
-Acromion and spine of the scapula
-Medial part of spine of scapula
Action:
-Depression and elevation of shoulder

Question 12

Pronator teres

Answer 12

Origin:
-Medial epicondyle of humerus & distal supracondylar ridge
- Medial side of coronoid process of ulna.
Insertion:
-Middle of lateral surface of the radius
Action:
-Pronates the forearm
-Flexes the forearm at elbow

Question 13

Extensor carpi ulni

Answer 13

Origin:
-Lateral epicondyle of humerus
Insertion:
-Base of 5th metacarpal
Action:
-Extends hand at wrist
-Adducts hand at wrist

Question 14

Brachioradialis

Answer 14

Origin:
-Lateral supracondylar ridge of humerus
Insertion:
-Styloid process of radius
Action:
-Flexes forearm at elbow

Question 15

Psoas Major

Answer 15

Origin:
- Body/bases of transverse processes of lumbar vertebrae
Insertion:
- Lesser trochanter of femur
Action:
-Flexes thigh at hip
-Laterally rotates thigh at hip
-Flexes vertebral column (torso)

Question 16

Tensor Fasciae Latae

Answer 16

Origin:
- Anterior Iliac crest
Insertion:
- Lateral condyle of tibia via iliotibial tract
Action:
-Abducts thigh at hip
-Flexes thigh at hip

Question 17

Pectineus

Answer 17

Origin:
- Pectineal line along the superior ramus of the pubis
Insertion:
- Posterior surface of femur, inferior to the lesser trochanter
Action:
-Adduct thigh at hip
-Flexes thigh at hip

Question 18

Iliacus

Answer 18

Origin:
- Iliac fossa of os coxa
Insertion:
- Lesser trochanter of femur
Action:
-Flexes the thigh at hip
-Laterally rotates thigh at hip
-Flexes trunk and pelvis on thigh (bend forward)

Question 19

Sartorius

Answer 19

Origin:
- Anterior superior iliac spine and the region just below it
Insertion:
- Proximal tibia, medial to tibial tuberosity (part of pes anserinus)
Action:
- flexes leg at knee

Question 20

Gracilis

Answer 20

Origin:
- Inferior border of pubic body near symphysis
Insertion:
- Proximal medial surface of tibia (part of pes anserinus)
Action:
- adducts thigh at hip

Question 21

Adductor longus

Answer 21

Origin:
- Superior aspect of pubis, below pubic tubercle
Insertion:
- Middle third of linea aspera of femur along medial lip
Action:
-Adduct thigh at hip
-Flexes thigh at hip

Question 21

Rectus femoris

Answer 21

Origin:
- Anterior inferior iliac spine and ilium above the acetabulum
Insertion:
- Quadriceps tendon to base of patella and onto tibial tuberosity via the patellar ligament
Action:
- flexes thigh at hip

Question 22

Vastus Lateralis

Answer 22

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- Quadriceps
Action:

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Answer 32

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