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28 Cards in this Set
- Front
- Back
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What are the roots of the brachial plexus?
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Ventral rami of C5-T1
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What are the trunks of the brachial plexus?
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upper (C5-6), middle (C7), and lower (C8-T1)
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What are the direct branches off the superior trunk of the brachial plexus?
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suprascapular nerve (C4-5), nerve to subclavius
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What nerve branch comes off the anterior division of the upper trunk of the brachial plexus?
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lateral pectoral nerve
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What does the anterior division of the superior trunk of the brachial plexus merge into?
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the lateral cord
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What does the posterior division of the superior trunk of the brachial plexus merge into?
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the posterior cord
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What do the divisions of the middle trunk of the brachial plexus merge into?
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anterior division merges into the lateral cord, posterior division into the posterior cord
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What trunk and division of the brachial plexus gives rise to the medial pectoral nerve?
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anterior division of inferior trunk
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What does the lateral cord become?
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musculocutaneous nerve, also provides sensory axons to the median nerve
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What does the posterior cord of the brachial plexus become?
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axillary and radial nerves (upper subscapular, thoracodorsal, lower subscapular)
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What nerve supplies the arm flexors?
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musculocutaneous (C5-6)
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What branches make up the median nerve?
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C5-T1
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What nerve supplies forearm/wrist flexors and pronators as well as LOAF muscles in Hand (lumbricals of index and middle fingers, opponens pollicui, abductor pollicis longus and flexor pollicus brevis)?
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Median nerve
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What nerve supplies the deltoid and teres minor muscles?
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axillary nerve (C5-6)
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What nerve supplies all of the extensors of the forearm and hand?
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radial nerve (C5-8)
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1st rib fractures may cause injuries to what portion of the brachial plexus?
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lower trunk
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Midhumeral fractures are often associated with injury to what nerve?
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radial nerve
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Where do the sensory roots of the median nerve arise from?
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C5-7
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Where do the motor roots of the median nerve arise from?
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C8-T1
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Nerve root avulsion is more common in what portion of the brachial plexus?
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lower plexus (nerve is bound down in connective tissue at C5-7
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what two nerves come directly off of the roots?
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long thoracic (C5,6,7); dorsal scapular nerve (C5)
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what does the long thoracic nerve supply?
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serratus anterior
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what does the dorsal scapular nerve supply?
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and levator scapulae muscles
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what does the suprascapular nerve supply?
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sensory fibers to the shoulder joint and provides motor innervation to the supraspinatus and infraspinatus muscles
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where does the phrenic nerve lie in relation to the plexus?
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anterior
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where does the spinal accessory nerve (CN XI)lie in relation to the plexus?
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posterior
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what does the phrenic nerve supply?
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diaphram
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what does the accessory nerve supply?
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trapezius
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