The shoulder and rotator cuff Flashcards
What are the origins/insertions of supraspinatus
Origin: Supraspinous fossa of scapula
Insertion: Greater tubercle of humerus
WHat is the function of supraspinatus?
Abducts and stablises arm at glenohumeral joint
What innervates supraspinatus
Suprascapular nerve (C5-6)
What supplies supraspinatus with blood
Suprascapular artery, dorsal scapular artery
What are the origins/insertions of subscapularis
Origin: Subscapular fossa of scapula
Insertion: Lesser tubercle of humerus
What is the action of subscapularis
Medially rotates and stablises arm at glenohumeral joing
What innervates subscapularis
Upper and lower subscapular nerves (C5-C7)
What supplies subscapularis with blood
Subscapular artery, suprascapular artery, lateral thoracic artery
What are the origins/insertions of infraspinatus?
Origins: Infraspinous fosssa of scapula
Insertion: Greater tubercle of humerus
What is the function of infraspinatus
Lateral rotation, transverse abduction, stablises at glenohumeral joint
What innervates infraspinatus
Subscapular nerve (C5-6)
What supplies infraspinatus with blood?
Circumflex scapular artery, suprascapular artery
What are the origins/insertions of teres minor
Origin: Posterior superior lateral scapula
Insertion: Greater tubercle of humerus
What is the action of teres minor
Laterally rotates, transversely abducts, and stablises arm at glenohumeral joint
What innervates teres minor
axillary nerve (C5-6)
What supplies teres minor with blood
Circumflex scapular artery, posterior circumflex humeral artery
When a shoulder dislocates, where does the humeral head move to
Inferiorly, then anterior or posterior. This is because it is weaker inferiorly, no rotator cuff muscles present inferiorly
What muscles of the rotator cuff are posterior to glenohumeral joint
Suprasoinatus must superiorly,
Then infraspinatus,
Then teres minor most inferiorly
What muscles of the rotator cuff are anterior
Subscapularis
