Scapulohumeral Muscles

Question 0

suprspinatus

Answer 0

O: supraspinous fossa
I: sup facet of greater tubercle
N: suprascapular nerve (C4, C5, C6)
A: initiates and assists deltoid by abducting arm 15 degrees

Question 1

deltoid

Answer 1

O: lateral 1/3 of clavicle, acromian, spine of scapula
I: deltoid tuberosity of humerus
N: axillary (C5, C6)
A: clavicular part (ant)– flexes and med rotates arm
acromial part (middle)– abducts arm
spinal part (post)– extends and laterally rotates arm

Question 2

infraspinatous

Answer 2

O: infraspinous fossa of scapula
I: middle fact of greater tubercle
N: suprascapular nerve (C5, C6)
A: laterally rotates arm, holds humeral head in glenoid cavity

Question 3

teres minor

Answer 3

O: middle part of lateral border of scapula
I: inf facet of greater tubercle
N: axillary nerve (C5, C6)
A: laterally rotates arm, holds humeral head in glenoid cavity

Question 4

subscapularis

Answer 4

O: subscapular fossa
I: lesser tubercle
N: upper and lower subscapular nerves (C5,C6, C7)
A: adducts and medially rotates arm, holds humeral head in place

Question 5

teres major

Answer 5

O: post surface of inf angle of scapula
I: medial lip on intertubercular sulcus
N: lower subscapular nerve (C5, C6)
A: adducts and medially rotates arm