Chapter 12: Appendicular Skeletal Muscles

Question 1

levator scapulae function

Answer 1

elevates & inferiorly rotates scapula

Question 2

levator scapulae origin & insertion

Answer 2

origin- transverse processes of c1-c4
insertion- superior part of medial border of scapula

Question 3

latissimus dorsi function

Answer 3

agonist of arm muscle, “swimmer’s muscle”

Question 4

latissimus dorsi origin (4) & insertion

Answer 4

origin- spinous processes of t7-t12, ribs 8-12, iliac crest, thoracolumbar fascia
insertion- intertubercular sulcus of humerus

Question 5

deltoid function

Answer 5

anterior fibers: flex & medially rotate arm
middle fibers: agonist of arm abduction
posterior fibers: extend & laterally rotate arm

Question 6

deltoid origin (3) & insertion

Answer 6

origin- acromial end of clavicle, acromion & spine of scapula
insertion- deltoid tuberosity of humerus

Question 7

pectoralis major function

Answer 7

agonist of arm flexion, horizontally adducts & medially rotates arm

Question 8

pectoralis major origin (3) & insertion

Answer 8

origin- medial clavicle, costal cartilages of ribs 2-6, body of sternum
insertion- lateral part of intertubercular sulcus of humerus

Question 9

biceps brachii function

Answer 9

flexes forearm

Question 10

biceps brachii origin & insertion

Answer 10

origin- supraglenoid tubercle of scapula (long head), coracoid process of scapula (short head)
insertion- radial tuberosity & bicipital aponeurosis

Question 11

gluteus maximus function

Answer 11

extends & laterally rotates thigh

Question 12

gluteus maximus origin (3) & insertion

Answer 12

origin- iliac crest, sacrum, coccyx
insertion- gluteal tuberosity of femur & linea aspera

Question 13

rectus femoris function

Answer 13

flexes thigh, extends leg

Question 14

rectus femoris origin & insertion (4)

Answer 14

origin- anterior inferior iliac spine
insertion- quadriceps tendon to patella & patellar ligament to tibial tuberosity

Question 15

gastrocnemius function

Answer 15

flexes leg & plantar flexes foot

Question 16

gastrocnemius origin & insertion

Answer 16

origin- superior posterior surfaces of lateral & medial condyles of femur
insertion- calcaneus