Central distribution of afferent and efferent components of the pudendal nerve in cat

Abstract

Central distribution of afferent and efferent components of the pudendal nerve was examined in the cat by the HRP method after applying HRP to the central cut end of the pudendal nerve. Retrogradely labeled neuronal cell bodies were located primarily in the feline homologue of the Onuf's X nucleus, constituting a slender longitudinal cell column in the ventral horn of the S1 and S2 cord segments. The Onuf's nucleus was present constantly from middle S1 to high S2 cord segments, and occasionally extended rostrally to high S1 or low L7, and caudally to middle S2, low S2, or high S3 cord segments. No sex differences were observed in the distribution pattern, number, and soma size of labeled neurons in the Onuf's nucleus. Transganglionically labeled dorsal root fibers were found to terminate ipsilaterally in the lamina I of the dorsal horn at levels of lower lumbar, sacral, and higher coccygeal cord segments and the gracile nucleus, and bilaterally with an ipsilateral predominance in the dorsal commissural gray and laminae III, IV, V, and VI of the dorsal horn at levels of lower lumbar, sacral, and higher coccygeal cord segments. Some labeled dorsal root fibers appeared to end ipsilaterally in the regions where the sacral parasympathetic preganglionic neurons have been shown to be located.

Striated Perineal Muscles: Location of Autonomic, Sensory, and Somatic Neurons Projecting to the Male Pig Bulbospongiosus Muscle

“…The BSM originates from the tunica albuginea lateral to the penis corpus spongiosum and terminates on the median septum of the perineum (Schaller, 1992), and it is innervated by the pudendal nerve as it has already been demonstrated in the cat (Martin et al, 1974;Yamamoto et al, 1978;Ueyama et al, 1984;Holstege and Tan, 1987), in the rat (Schrøder, 1980;Katagiri et al, 1986;Mc Kenna and Nadelhaft, 1986), in the monkey (Roppolo et al, 1985), and in the human foetouses (Yucel and Baskin, 2003).…”

Spinal 5‐HT2 receptor‐mediated facilitation of pudendal nerve reflexes in the anaesthetized cat

“…Somatic and sympathetic innervation of the lower urinary tract arises from somatic motor neurones in Onuf's nucleus (Ueyama et al, 1984;Thor et al, 1989b) and sympathetic preganglionic neurones in the intermediolateral cell column (Morgan et al, 1986), respectively. The somatic and sympathetic innervation is conveyed from the spinal cord to the lower urinary tract via the pudendal and hypogastric nerves, respectively.…”

Neural Control of the Lower Urinary Tract

“…These afferents differ markedly from other populations of pudendal nerve afferents innervating the sex organs as well as cutaneous and subcutaneous tissues of the perineum that terminate in the deeper layers of the dorsal horn (laminae II-IV) (317,639,653).…”