Suprascapular Nerve Palsy: Difference between revisions
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The suprascapular nerve branches out from the upper trunk of the brachial plexus. Its nerve roots are C5 and C6. Sporadically, it may have roots from C4 as well. From the posterior triangle of the neck, the nerve goes over the upper part of the scapula, then downward and laterally, parallel to the omohyoid muscle belly. It then passes below the suprascapular ligament and into the supraspinatus fossa where it innervates supraspinatus and continues while curving around the spinous process of the scapula, through the spinoglenoid notch and then into the infraspinatus fossa where it innervates infraspinatus.<ref name=":0" /> | The suprascapular nerve branches out from the upper trunk of the brachial plexus. Its nerve roots are C5 and C6. Sporadically, it may have roots from C4 as well. From the posterior triangle of the neck, the nerve goes over the upper part of the scapula, then downward and laterally, parallel to the omohyoid muscle belly. It then passes below the suprascapular ligament and into the supraspinatus fossa where it innervates supraspinatus and continues while curving around the spinous process of the scapula, through the spinoglenoid notch and then into the infraspinatus fossa where it innervates infraspinatus.<ref name=":0" /> | ||
== | ==Etiology== | ||
Compression neuropathy is | Compression neuropathy resulting from nerve entrapment is the most common cause of suprascapular nerve palsy. The common sites of nerve entrapment are the supraspinatus fossa and the spinoglenoid fossa. | ||
Trauma to the shoulder resulting from fractures of scapula, clavicle and proximal humerus can significantly damage the suprascapular nerve. | |||
Post-surgical complications after open or athroscopic shoulder surgery can lead to suprascapular nerve damage. | |||
Scapula dyskinesia can lead to suprascapular nerve palsy. | |||
Tumors, cysts and other space-occupying lesions around the shoulder can compress the suprascapular nerve. | |||
In rare cases, systemic conditions like systemic lupus erthymatosus (SLE) and rheumatoid arthritis (RA) can result in suprascapular nerve pasly. | |||
== Examination == | == Examination == | ||
Revision as of 16:35, 17 November 2021
Original Editor - Arnold Fredrick D'Souza
Top Contributors - Arnold Fredrick D'Souza, Kim Jackson, Joseph Zahn and Naomi O'Reilly
Introduction[edit | edit source]
The suprascapular nerve is a mixed nerve of the upper limb. Suprascapular nerve injury is experiencing an increase in clinical significance due to its role in shoulder pain and upper limb weakness.[1]
Anatomy[edit | edit source]
The suprascapular nerve branches out from the upper trunk of the brachial plexus. Its nerve roots are C5 and C6. Sporadically, it may have roots from C4 as well. From the posterior triangle of the neck, the nerve goes over the upper part of the scapula, then downward and laterally, parallel to the omohyoid muscle belly. It then passes below the suprascapular ligament and into the supraspinatus fossa where it innervates supraspinatus and continues while curving around the spinous process of the scapula, through the spinoglenoid notch and then into the infraspinatus fossa where it innervates infraspinatus.[1]
Etiology[edit | edit source]
Compression neuropathy resulting from nerve entrapment is the most common cause of suprascapular nerve palsy. The common sites of nerve entrapment are the supraspinatus fossa and the spinoglenoid fossa.
Trauma to the shoulder resulting from fractures of scapula, clavicle and proximal humerus can significantly damage the suprascapular nerve.
Post-surgical complications after open or athroscopic shoulder surgery can lead to suprascapular nerve damage.
Scapula dyskinesia can lead to suprascapular nerve palsy.
Tumors, cysts and other space-occupying lesions around the shoulder can compress the suprascapular nerve.
In rare cases, systemic conditions like systemic lupus erthymatosus (SLE) and rheumatoid arthritis (RA) can result in suprascapular nerve pasly.
