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Spinal Nerve Root Origin of the Median, Ulnar and Musculocutaneous Nerves and their Muscle Nerve Branches to the Canine Forelimb
Author(s) -
Sharp J.W.,
Bailey C.S.,
Johson R.D.,
Kitchell R.L.
Publication year - 1990
Publication title -
anatomia, histologia, embryologia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.34
H-Index - 35
eISSN - 1439-0264
pISSN - 0340-2096
DOI - 10.1111/j.1439-0264.1990.tb00911.x
Subject(s) - ulnar nerve , anatomy , nerve root , musculocutaneous nerve , spinal nerve , medicine , forelimb , median nerve , dorsum , elbow
Summary The contribution individual ventral spinal nerve roots made to the canine median nerve, ulnar nerve, musculocutaneous nerve, and their muscle nerve branches was determined electrophysiologically. Each spinal nerve root was sequentially stimulated. Utilizing quantitative signal averaging techniques, the evoked potential was measured at each tested peripheral nerve. Evoked potential to the median nerve originated from the seventh cervical sinal root (C7) through the second thoracic spinal root (T2) with most input from C8 and TI. The ulnar nerve received evoked potential from C7‐T2. Although T1 provided the major input to both the median and ulnar nerves, the relative contribution of T1 was greater in the ulnar nerve. The musculocutaneous nerve received input from ventral spinal roots C6‐Tl with C6 and C7 providing most of the evoked potential. The ventral spinal roots which supplied the bulk of the evoked potential to a particular muscle nerve were consistent between individual dogs. Variation of evoked potential input was greatest from spinal roots which supplied less than 10% of the total potential.