Entrapment neuropathy Entrapment neuropathy of suprascapular nerve 2013-03-14T08:09:05Z UMLS:C0393890 Suprascapular nerve entrapment An entrapment neuropathy of the suprascapular nerve, presenting with shoulder weakness confined to the supraspinatus muscle (this muscle initiates shoulder abduction) or to the infraspinatus (this muscle externally rotates the arm), as well as with pain in the posterior part of the shoulder and upper periscapular region. HP:0012216 SNOMEDCT_US:230635000