Muscles of the Shoulder & Posterior Arm Flashcards
what are the attachments of the Deltoid
Medial: spine of scapula, acromion of the scapula, lateral 1/3 of the clavicle
Lateral: deltoid tuberosity of the humerus
what is the action of the Deltoid
flexion, medial & lateral rotation, extension, abduction of humerus
what are the innervations and artery of the Deltoid
Axillary Nerve & posterior circumflex humeral artery
what are the attachments of the Supraspinatus
Medial: supraspinous fossa of the scapula
Lateral: superior facet of the greater tubercle of the humerus
what is the action of the supraspinatus
helps delt abduct arm at GH joint & initiates abduction from an already adducted position
what are the innervations of the supraspinatus
Suprascapular Nerve
what are the attachments of the Infraspinatus
Medial: infraspinous fossa of the scapula
Lateral: middle facet of the greater tubercle of the humerus
what is the action of the infraspinatus
laterally rotates the humerus & abducts
what are the innervations of the infraspinatus
suprascapular nerve
what are the attachments of the teres major
Medial: inferior angle of the scapula
Lateral: medial lip of the intertubercular sulcus of the humerus
what is the action of the teres major
adducts and medially rotates the humerus
what innervates and supplies blood to the teres major
subscapular nerve (lower) & circumflex scapular artery
what are the attachments of the teres minor
Medial: lateral boarder of the scapula
Lateral: inferior facet of the greater tubercle of the humerus
what is the action of the teres minor
laterally rotates the humerus
what innervates the teres minor
axillary nerve
