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Dermatome mapping in the rat hindlimb by electrical stimulation of the spinal nerves
Y Takahashi1, Y Nakajima, T Sakamoto
1Department of Orthopaedic Surgery, Chiba University, Japan.
Abstract:
In rats treated with Evans blue (i.v.), electrical stimulation of the lumbar spinal nerves produced an extravasation zone in the skin. Stimulation of L1 produced extravasation in the lower abdomen; that of L2, in the cranial region of the hindlimb; that of L3, in the ventral region of the hindlimb and the medial paw; that of L4, in the lateral region of the hindlimb and the middle paw; that of L5, in the caudal region of the hindlimb and the lateral paw; and that of L6, in the caudal region of the hindlimb and the scrotum. Since the substance P antagonist FK224 inhibited the extravasation caused by stimulation of the sciatic nerve, the extravasation zones appeared to be related to antidromic activation of afferent C-fibers. Thus, a dermatome of afferent C-fibers was revealed in rats.