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21 Cards in this Set
- Front
- Back
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What passes through the quadrangular space?
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The posterior circumflex humeral artery and the axillary nerve
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What are the boundaries of the quadrangular space?
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medially by the tendon of the long head of the triceps, laterally by the humerus, superiorly by teres minor, and inferiorly by teres major
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What innervates infraspinatus?
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the suprascapular nerve, off the superior trunk of the brachial plexus.
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What innervates teres major?
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the lower subscapular nerve.
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What innervates subscapularis?
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upper and lower subscapular nerves, off the posterior cord of the brachial plexus.
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What innervates supraspinatus?
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the suprascapular nerve, off the superior trunk of the brachial plexus.
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What does the axillary nerve innervate?
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Deltoid and teres minor
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What is the brachial artery?
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an extension of the axillary artery distal to teres major
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What is the subscapular artery?
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a branch of the third part of the axillary artery that gives off the thoracodorsal and circumflex scapular arteries
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Where does the circumflex scapular artery come from?
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Axillary artery via subscapular artery
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What is the suprascapular artery?
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a branch of the thyrocervical trunk that supplies supraspinatus and infraspinatus with blood.
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What supplies blood to the supraspinatus and infraspinatus?
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suprascapular artery
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In a patient with Erb-Duchenne palsy, a nerve arising from the superior trunk of the brachial plexus is nonfunctional. This nerve is the:
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suprascapular nerve
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The axillary nerve arises directly from which part of the brachial plexus?
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Posterior cord
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What nerve innervates the trapezius?
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The accessory nerve -- CN XI
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If the second part of the axillary artery was interrupted, collateral blood flow could pass from branches of the thyrocervical trunk into which artery?
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circumflex scapular artery
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In a fracture of the surgical neck of the humerus, which artery may be injured?
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posterior and anterior circumflex arteries
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four muscles which are strong medial rotators of the arm:
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subscapularis, pectoralis major, teres major, and latissimus dorsi
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two lateral rotators of the arm
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Infraspinatus and teres minor
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What muscle is responsible for initiating abduction of the arm?
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supraspinatus
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What is the action and innervation of the rhomboids?
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rhomboids retract the scapula. They are innervated by the dorsal scapular nerve, which comes from C5
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