Chapter 10: Upper Limb Muslces

Question 1

name the muscles that aid in scapular movement and stabilzation.

Question 2

name the six muscles that attach the scapula to the thorax

Answer 2

trapezius

levator scapulae

rhomboideus minor

rhomboideus major

serratus anterior

pectoralis minor

Question 3

what muscles attach the arm to the thorax

Question 4

list the four muscles forming the rotator cuff and describe their function

Answer 4

supraspinatus: helps stabilize the shoulder and assists in arm abduction

infraspinatus: during contraction, adduction and lateral rotation of the arm

teres minor: same action as the infraspinatus

subscapularis: assists in medial rotation of the arm

Question 5

what muscles cause flexion and extension of the shoulder

Question 6

what muscles cause adduction and abduction of the arm?

Question 7

what muscle abducts the arm to 90 degrees?

Question 8

what muscle abducts the arm above 90 degrees?

Question 9

what muscles cause rotation of the arm?

Question 10

List the muscles that cause flexion and extension of the elbow and where are they located?

Answer 10

triceps brachii

anconeus

both located posteriorly on the arm.

Question 11

what muscles produce supination and pronation of the forearm? Where are they located?

Question 12

describe the muscle groups that cause flexion and extension of the wrist

Question 13

contrast the location and actions of the extrinsic and intrinsic hand muscles.

Question 14

What is the retinaculum?

Answer 14

a band of fibrous connective tissue that encircles the flexor and extensor muscles of the wrist to hold them in place.

Question 15

Describe the muscles that move the thumb.

Question 16

The tendons of what muscles form the anatomical snuffbox?