Shoulder Anatomy 2 Flashcards
what is the ratio of movement between GH and scapulothoracic motion?
2:1
what is the ideal length-tension relationship?
80-120
what is the purpose of the scapulohumeral rhythm?
promotes optimal length tension relationship
where does the initial 60 degrees of flexion or 30 degrees of abduction occur?
at the GH joint
where does the midrange of motion occur?
scapula
where does the latter part of motion occur?
GH joint
which 2 muscles contribute to elevation?
serratus anterior
trapezius
what do you have after the 1st phase of motion?
30 degrees scapular
60 degrees GH
SC joint has to be working
what do you have after the 2nd phase of motion?
30 degrees scapular
60 degrees Gh
rotation of clavicle happens at the AC joint
what is close-packed position?
most stable position (most congruence)
what is open chain?
when the ends of the limbs are free to move without causing motion at another joint
what is closed chain?
when motion at one joint will produce motion at all the others in the chain
what is an isometric contraction?
tension develops and there is not movement
what is an isotonic contraction?
tension overcomes load and movement occurs
- concentric-shortening
- eccentric-lengthening
what are the origin/insertion of deltoid?
O:acromial end of clavicle/acromion/spine of scapula
I: deltoid tuberosity
how is deltoid innervated?
axillary nerve
what are the O/I of supraspinatus?
O: suprapsinous fossa
I: greater tubercle
how is supraspinatous innervated?
suprascapular nerve
what are the O/I of infraspinatous?
O: infraspinous fossa
I: greater tubercle
how is the infraspinatous innervated?
suprascapular nerve
what are the O/I of teres minor?
O: upper lateral border of scapula
I: greater tubercle
how is the teres minor innervated?
axillary nerve
what are the O/I of subscapularis?
O: subscapular fossa
I: lesser tubercle
how is the subscapularis innervated?
subscapular nerve
