Muscle Lab 1 - Upper Body

Question 1

Where is the origin of the sternocleidomastoid?

Answer 1

Manubrium of sternum & medial clavicle

Question 2

Where is the insertion of the sternocleidomastoid?

Answer 2

Mastoid process

Question 3

State one action of the sternocleidomastoid.

Answer 3

Flexion of neck, lateral rotation of neck

Question 4

Where is the origin of the pectoralis major?

Answer 4

Sternum and medial half (sternal end) of clavicle

Question 5

Where is the insertion of the pectoralis major?

Answer 5

Intertubercular groove of the humerus

Question 6

State one action of the pectoralis major.

Answer 6

Flexion, adduction, and medial rotation of humerus

Question 7

Where is the origin of the trapezius?

Answer 7

Occipital and spinous processes of C7-T12

Question 8

Where is the insertion of the trapezius?

Answer 8

Lateral clavicle, lower acromion and spine of scapula

Question 9

State one action of the trapezius.

Answer 9

Lateral rotation, elevation, depression, retraction of scapula

Question 10

Where is the origin of the deltoid?

Answer 10

Acromion and spine of scapula; lateral clavicle

Question 11

Where is the insertion of the deltoid?

Answer 11

Deltoid tuberosity of humerus

Question 12

State one action of the deltoid.

Answer 12

Abduction of humerus; aids flexion, extension, rotation of arm

Question 13

Where is the origin of the latissimus dorsi?

Answer 13

Aponeurosis from T7 to posterior 3rd iliac crest

Question 14

Where is the insertion of the latissimus dorsi?

Answer 14

Intertubercular groove of humerus

Question 15

State one action of the latissimus dorsi.

Answer 15

Extension, adduction, medial rotation of humerus

Question 16

Where is the origin of the serratus anterior?

Answer 16

Outer anterior surface of upper 8 ribs

Question 17

Where is the insertion of the serratus anterior?

Answer 17

Medial (vertebral) border of scapula

Question 18

State one action of the serratus anterior.

Answer 18

Lateral upward rotation, protection of scapula, stabilizes scapula against chest

Question 19

Where is the origin of the rhomboids?

Answer 19

Spinous process C7-T5

Question 20

Where is the insertion of the rhomboids?

Answer 20

Vertebral border of scapula

Question 21

State one action of the rhomboids.

Answer 21

Retraction, downward rotation of scapula

Question 22

Where is the origin of the teres major?

Answer 22

Inferior angle of scapula

Question 23

Where is the insertion of the teres major?

Answer 23

Intertubercular groove of humerus

Question 24

State one action of the teres major.

Answer 24

Medial rotation, adduction of humerus

Question 25

Where is the origin of the supraspinatus?

Answer 25

Supraspinous fossa of scapula

Question 26

Where is the insertion of the supraspinatus?

Answer 26

Greater tubercle of humerus

Question 27

State one action of the supraspinatus.

Answer 27

Aids in abduction of humerus; stabilizes shoulder joint

Question 28

Where is the origin of the infraspinatus?

Answer 28

Infraspinous fossa of scapula

Question 29

Where is the insertion of the infraspinatus?

Answer 29

Greater tubercle of humerus

Question 30

State one action of the infraspinatus.

Answer 30

Lateral rotation of humerus; stabilized shoulder joint

Question 31

Where is the origin of the teres minor?

Answer 31

Lateral border of scapula

Question 32

Where is the insertion of the teres minor?

Answer 32

Greater tubercle of humerus

Question 33

State one action of the teres minor.

Answer 33

Lateral rotation of humerus; stabilizes shoulder joint

Question 34

Where is the origin of the subscapularis?

Answer 34

Subscapular fossa of scapula

Question 35

Where is the insertion of the subscapularis?

Answer 35

Lesser tubercle of humerus

Question 36

State one action of the subscapularis.

Answer 36

Medial rotation of humerus; stabilized shoulder joint

Question 37

Where is the origin of the biceps brachii?

Answer 37

Long head: supraglenoid tubercle of scapula Short head: coracoid process of scapula

Question 38

Where is the insertion of the biceps brachii?

Answer 38

Radial tuberosity

Question 39

State one action of the biceps brachii.

Answer 39

Flexion of elbow; Supination of forearm

Question 40

Where is the origin of the triceps brachii?

Answer 40

Long head: infraglenoid turtle of scapula Lateral head: upper posterior humerus Medial head: lower posterior humerus

Question 41

Where is the insertion of the triceps brachii?

Answer 41

Olecranon process of ulna

Question 42

State one action of the triceps brachii.

Answer 42

Extension of elbow; Aids in adduction of humerus Long head: stabilized shoulder joint; extension of humerus

Question 43

Where is the origin of the brachioradialis?

Answer 43

Upper, lateral supracondylar ridge of humerus

Question 44

Where is the insertion of the brachioradialis?

Answer 44

Styloid process of radius

Question 45

State one action of the brachioradialis.

Answer 45

Flexion of the elbow

Question 46

Where is the origin of the pronator teres?

Question 47

Where is the insertion of the pronator teres?

Question 48

State one action of the pronator teres.

Answer 48

Pronation of forearm; flexion of the elbow