Kines Exam 2

both arms are flexed at shoulder height, right thumb is between left hand, push right thumb up against left hands resistance, what is the joint action of the top hand? What is the joint action of the right hand? what muscles are active in both actions?

Top, left hand, extension, sternal bottom, right hand, clavicular

both arms are flexed at shoulder height, right thumb is between left hand, push right thumb down against left hands resistance, what is the joint action of the top hand? What is the joint action of the right hand? what muscles are active in both actions?

top, left hand, flexion, clavicular bottom, right hand, extension, sternal

when flexing the shoulder joint against shoulder high resistance of a partner what parts of the pec major were involved?

Clavicular

Your arm is at shoulder height being resisted by a partner, the Pec major clavicular portion was the muscle action involved. The partner removes resistance but why did pectoral involvement not change? 

There was external resistance, but now there is less external force. Still need flexors to overcome gravity and weight of the arm 

You are extending the shoulder joint at shoulder high resitance against a partner what part of the pec major is involved?

sternal clavicular

Your arm is extended at shoulder high resistance of a partner; the sternal portion of the pec major is active. Your partner removes resistance while you are still holding your arm at should height. What portion of the pec major is involved? Why did pectoral movement change? 

There is no external force you have to fight the weight of the arm and gravity. Your flexors which are the clavicular pec major are holding your arm up 

what joint action to deltoid and supraspinous have in common

abduction

what are the rotator cuff muscles

supraspinatus, infraspinatus, teres minor, subscapularis

what is the most injured and largest role muscle in the rotator cuff

supraspinatus

what is the function of the rotator cuff muscles

provide joint stability, and prevent impingement

Why does the rhomboid contract when the teres major extends the humerus but does not when the lats extend the humerus.

the scapula rotates upward due to teres major shortening and extending the humerus, the rhomboid has a downward rotation which counters the action causing a stabilized movement. The lat does not move the scapula because there is no attachment point

the coracobrachialis is a flexor of the humerus, this is not always true, sometimes it is an extensor. Why does it act as an extensor? 

when the arm is above 90 degrees 

You are doing a narrow grip bench press going down, what is the joint action of the humerus? What is the type of contraction? What is the muscle group involved? What is the muscles most involved? 

Extension, eccentric, flexors, anterior delt, pec major clavicular, coracobrachialis 

You are doing a narrow grip bench press going up, what is the joint action of the humerus? What is the type of contraction? What is the muscle group involved? What is the muscles most involved?

flexion, concentric, flexors, anterior delt, pec major clavicular, coracobrachialis 

You are doing a narrow grip bench press going up, what is the joint action of the humerus? What is the type of contraction? What is the muscle group involved? What is the muscles most involved?

Horizontal adductors, concentric, horizontal adductors, anterior delt, pec major sternal and clavicular, cb 

You are doing a wide grip bench press going down, what is the joint action of the humerus? What is the type of contraction? What is the muscle group involved? What is the muscles most involved?

Horizontal abduction, eccentric, horizontal adductors, anterior delt, pec major sternal and clavicular, cb

why is doing a wide grip bench press easier then doing a narrow grip

you have more muscles involved 

Where does the capitulum articulate with 

head of the radius

Where is the trochlear notch in comparison to the capitilium

medial