Summary
The suprascapular nerve from 14 horses, which had no clinical evidence of spinatus muscle atrophy, were obtained to determine whether the nerve was sub-clinically compressed at the scapular edge. The nerves were divided into three portions, proximal and distal to the scapular edge and as it reflected around it. In nine horses there was evidence of a chronic neuropathy which varied in severity and which was most severe at the site of reflection, where the nerve appeared constricted by a tendinous band. At this site the predominant change was that of chronic demyelination and remyelination, with many scattered thinly myelinated fibres and occasionally profuse onion bulb formation. There were also occasional regenerating clusters, which were the only abnormalities seen in the distal nerve. Renaut bodies appeared to be more common and larger in nerves with chronic focal neuropathy. Teased fibres confirmed the chronic myelin sheath changes, and the presence of many paranodal swellings suggested a possible chronic compressive aetiology. This is the first reported spontaneous entrapment neuropathy in the domestic animals.
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References
Adams OR (1976) Lameness in the horse. Lea and Febiger, Philadelphia, p 162
Aguayo AJ, Nair CPV, Midgley R (1971) Experimental progressive compression in neuropathy in the rabbit. Arch Neurol 24:358–363
Anderson MH, Fullerton PM, Gilliatt RW, Hern JEC (1970) Changes in the forearm associated with median nerve compression at the wrist in the guinea-pig. J Neurol Neurosurg Psychiatry 33:70–79
Clein LG (1975) Suprascapular entrapment neuropathy. J Neurosurg 43:337–342
Duncan ID, Schneider RK (1985) Equine suprascapular neuropathy (Sweeny): clinical and pathologic observations. Proceedings of the 31st Convention of the American Association of Equine Practicioners
Duncan ID, Griffiths IR, Madrid RE (1978) A light and electron microscopic study of the neuropathy of equine idiopathic laryngeal hemiplegia. Neuropathol Appl Neurobiol 4:483–501
Jefferson D, Eames RA (1979) Subclinical entrapment of the lateral femoral cutaneous nerve. An autopsy study. Muscle Nerve 2:145–154
Jefferson D, Neary D, Eames RA (1981) Renaut body distribution at sites of human peripheral nerve entrapment. J Neurol Sci 49:19–29
Neary D, Eames RA (1975) The pathology of ulnar nerve compression in man. Neuropathol Appl Neurobiol 1:69–88
Neary D, Ochoa J, Gilliatt RW (1975) Subclinical entrapment neuropathy in man. J Neurol Sci 24:283–298
Ochoa J, Marotte L (1973) The nature of the nerve lesion caused by chronic entrapment in the guinea-pig. J Neurol Sci 19:491–495
Ortman JA, Sahenk Z, Mendell JR (1983) The experimental production of Renaut bodies. J Neurol Sci 62:233–241
Renaut J (1881) Recherche sur quelques points particular d'histologie des nerfs. Arch Physiol (Paris) 8:180–190
Stewart JD, Aguayo AJ (1984) Compression and entrapment neuropathies. In: Dyck PJ, Thomas PK, Lambert EH, Bunge RP (eds) Peripheral neuropathy, 2nd edn. Saunders, Philadelphia, pp 1435–1457
Windebank AJ (1984) Inherited recurrent focal neuropathies. In: Dyck PJ, Thomas PK, Lambert EH, Bunge RP (eds) Peripheral neuropathy, 2nd edn. Saunders, Philadephia, pp 1656–1679
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Duncan, I.D., Schneider, R.K. & Hammang, J.P. Subclinical entrapment neuropathy of the equine suprascapular nerve. Acta Neuropathol 74, 53–61 (1987). https://doi.org/10.1007/BF00688338
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DOI: https://doi.org/10.1007/BF00688338