shoulder muscles Flashcards
memorize origin, action, innervation
Where does the supraspinatus originate?
supraspinanous fossa (scapula)
Where is the insertion point of the supraspinatus?
Greater tubercle (humerus)
What action does the supraspinatus produce?
shoulder abduction
what nerve is the supraspinatus innervated by?
suprascapular nerve
This muscle originates at the infraspinous fossa (scapula)
Infraspinatus muscle
Where is the infraspinatus inserted?
Greater tubercle (humerous)
Action of infraspinatus
shoulder EROT
what nerve is the infraspinatus innervated by?
Suprascapular nerve
Where does the teres minor originate?
inferior lateral border of scapula
What is the insertion point of the teres minor?
greater tubercle (humerous)
what action does the teres minor exhibit?
shoulder EROT and extension
what nerve innervates the teres minor muscle?
axillary nerve
the subscapular fossa (scapula) is the originate point of this muscle
subscapularis
what is the insertion point of the subscapularis?
lesser tubercle (humerus)
what action does the subscapularis produce?
shoulder IROT
what bones do the pectoralis major originate at?
clavicle (clavicular head), sternum, upper ribs (sternocostal head)
where are the insertion point(s) of the pectoralis major?
greater tubercle and intertubercular sulcus of humerus
what action does the pectoralis major produce?
shoulder abduction and IROT
what nerve(s) innervate the pectoralis major?
medial and lateral pectoral nerves
the latissimus dosi muscle originates at
spines of T7 to L5, crests of sacrum and ilium, ribs 9 to 12
what is the insertion point of the latissimus dorsi?
intertubercular sulcus of humerus
action of latissmus dorsi?
shoulder extension, adduction, IROT; draws arm inferiorly and posteriorly
what nerve innervates the latissmus dorsi?
thoracodorsal nerve
where does the pectoralis minor originate?
ribs 3 to 5
