Lab Exam 1 (The shoulder, shoulder girdle, and scapula)

Question 1

Sternocleidomastoid

Answer 1

Origin- clavicle and manubrium
Insertion- Mastoid process of the temporal bone
Action- flexes, laterally flexes, and rotates head to opposite side

Question 2

Trapezius

Answer 2

Origin- occipital protuberance, C7-T12, spinous processes
Insertion- clavicle; acromion process and spine of the scapula
Action-
Upper: extends head or elevates shoulder girdle
Middle: retracts and stabilizes the scapula
Lower: depresses scapula and shoulder girdle

Question 3

Levator Scapulae

Answer 3

Origin- C1-C4 transverse processes
Insertion- superior angle of the scapula
Action- elevates the scapula

Question 4

Rhomboid Minor

Answer 4

Origin- C7-T1 spinous processes
Insertion- medial border of the scapula
Action- scapular retraction

Question 5

Rhomboid Major

Answer 5

Origin- T2-T5 spinous processes
Insertion-medial border of the scapula
Action-scapular retraction

Question 6

Pectoralis Minor

Answer 6

Origin- ribs 3-5
Insertion- coracoid process of the scapula
Action- depresses the scapula; elevates ribs 3-5

Question 7

Serratus Anterior

Answer 7

Origin- ribs 1-8
Insertion- inferior angle and medial border of the scapula
Action- scapular protraction

Question 8

Latissimus Dorsi

Answer 8

Origin- T7 spinous process through sacrum
Insertion- Intertubercular groove of humerus
Action- Adducts, extends and medially rotates the shoulder

Question 9

Teres Major

Answer 9

Origin- Axillary(lateral) border of scapula
Insertion- Intertubercular groove of humerus
Action- extends shoulder

Question 10

Pectoralis Major

Answer 10

Origin- Clavicle; sternum; true ribs
Insertion- Intertubercular groove of humerus
Action- shoulder medial rotation and adduction

Question 11

Deltoid

Answer 11

Origin- clavicle; acromion process; spine of the scapula
Insertion- deltoid tuberosity of the humerus
Action- abducts the shoulder

Question 12

Supraspinatus

Answer 12

Origin- Supraspinous fossa of scapula
Insertion- greater tubercle of humerus
Action- abducts shoulder

Question 13

Infraspinatus

Answer 13

Origin- infraspinous fossa of scapula
Insertion- greater tubercle of humerus
Action- laterally rotates the shoulder

Question 14

Teres Minor

Answer 14

Origin- lateral border of the scapula
Insertion- greater tubercle of the humerus
Action- laterally rotates the shoulder

Question 15

Subscapularis

Answer 15

Origin- subscapular fossa of the scapula
Insertion- lesser tubercle of humerus
Action- medially rotates shoulder