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The suprascapular nerve is a mixed (sensory and motor) nerve that branches from the upper trunk of the brachial plexus. It is derived from the ventral rami of cervical nerves C5-C6. It provides motor innervation to the supraspinatus muscle , and the infraspinatus muscle .
Since the suprascapular nerve provides sensory information to 70% of the joint capsule, blocking this nerve can help with post-operative shoulder pain. A nerve stimulator, ultrasound device, or a needle insertion that is 1 cm above the midpoint of the scapular spine can quickly block the suprascapular nerve. [24]
However, a recent study using ultrasound to follow the spread of local anesthetic demonstrated an improved success rate of the block (relative to blocks done with nerve stimulator alone) even at the inferior roots of the plexus. [2] For supraclavicular block, nerve stimulation with a minimal threshold of 0.9 mA can offer a dependable block. [11]
A common tradeoff when electing to a neurectomy is that numbness along the nerve distribution is expected. Studies that have measured how bothersome numbness is to patients have found that most patients are not bothered at all by the numbness, and the ones that are find the numbness minimally bothering. [16] [17]
The most commonly involved nerves are the suprascapular nerve, musculocutaneous nerve, and the axillary nerve. [9] [10] The signs of Erb's palsy include loss of sensation in the arm and paralysis and atrophy of the deltoid, biceps, and brachialis muscles. [6] "The position of the limb, under such conditions, is characteristic: the arm hangs by ...
subclavian nerve (C5-C6) suprascapular nerve (C5-C6) anterior division of upper trunk (C5-C6, forms part of lateral cord) posterior division of upper trunk (C5-C6, forms part of posterior cord) The axillary, radial, musculocutaneous and median nerves all contain axons derived from the upper trunk.
Damage to the axillary artery [13] and axillary nerve (C5, C6) may result. The axillary nerve is injured in 37% making it the most commonly injured structure with this type of injury. [14] Other common, associated, nerve injuries include injury to the suprascapular nerve (29%) and the radial nerve (22%). [14]
The suprascapular artery and suprascapular nerve pass around the great scapular notch anteroposteriorly. Supraspinatus and infraspinatus are both supplied by the suprascapular nerve , which originates from the superior trunk of the brachial plexus (roots C5-C6).