muscles of the elbow (2)

Question 1

what type of muscle is the brachialis ?

Answer 1

mobility muscles due to insertion being close to elbow

Question 2

when is the moment arm the greatest for brachialis

Answer 2

> 100° of elbow flxion

Question 3

what type of muscle is the biceps ?

Answer 3

mobility

Question 4

when is the moment arm the greatest for biceps

Answer 4

80-100° of elbow flx

Question 5

when is the biceps less effective as an elbow flexor

Answer 5

when the arm is in full ext

Question 6

when is the biceps brachii most active for elbow flex

Answer 6

when the arm is supinated

Question 7

what type of muscle is the brachioradialis ?

Answer 7

compressing

Question 8

when is the moment arm the greatest for brachioradialis

Answer 8

100-120° of elbow flex

Question 9

T/F: the triceps is affected by the position of the forearm

Answer 9

F ( it is unaffected)

Question 10

when the elbow is ext when shoulder is in hyperextension the triceps is in ____ insufficiency

Answer 10

active

Question 11

does the force production of the triceps depends on the shoulder position?

Answer 11

yes

Question 12

what muscle acts as an synergist to prevent elbow flx

Answer 12

triceps

Question 13

what does the anconeus assist with

Answer 13

forearm extension

Question 14

what are the heads of the pronator teres

Answer 14

humeral and radial

Question 15

pronator teres is a __ joint muscle

Answer 15

2

Question 16

what does the pronator teres stabilize

Answer 16

the proximal joint

Question 17

what is the action of pronator teres

Answer 17

pronation and elbow flexion

Question 18

the pronator quadratus is a __ joint muscle

Answer 18

1

Question 19

the pronator quad acts as ___ stabilizer of the distal joint

Answer 19

dynamic

Question 20

what is the action of the biceps brachii

Answer 20

radioulnar supinator and elbow flexor

Question 21

what muscle is active in all postions and wraps around radius in pronation to perform uncoiling/spinning

Answer 21

supinator

Question 22

what does the pronator teres stabilize

Answer 22

proximal radioulnar and humeroradial joints

Question 23

when is the pronator quad actived

Answer 23

in resisted and unresisted pronation as well as fast or slow pronation

Question 24

supinator is a ___ joint muscle

Answer 24

1

Question 25

when does the supinator have the greatest torque

Answer 25

75% of pronation

Question 26

when may the brachiorad act as a pronator ? supinator?

Answer 26

when the forearm is in supinator
when the forearm is in pronation

Question 27

when is the brachiorad most active

Answer 27

during alternation of sup/pro with elbow at 90°