TUBAL NERVES

ORIGIN: Inferior hypogastric plexus

COURSE/DISTRIBUTION: These nerves arise from the inferior hypogastric plexus and accompany the ovarian vessels in the mesosalpinx to reach the uterotubal junction. It communicates in the mesosalpinx with the uterine nerves. It supplies the fallopian tubes, although its function in this organ is unknown. It may well be responsible for sexual response in the fallopian tube, a physiological parameter which has not been well studied. It is however suggested that its response is to contract rhythmically like the uterus and cervix, thereby allowing the sperm to pass in to the fallopian tube by a suctional method within seconds of ejaculation. The fast phase of sperm transport is then followed by a slower phase, which allows sperm to swim up to the fallopian tube. These two phases have been demonstrated in lower animals. In such, sperm cells have been found in the peritoneal cavity within seconds of ejaculation. The importance of the fast phase of sperm transport is that, if it exists at all in the human, it may assist fertility by providing a fast means of transport. And it seems that it would be regulated by orgasm. Hence, if this is true, orgasm, as we have always known but not understood, seems to have a positive effect on fertility.

BRANCHES:

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Cervical branches

FUNCTIONAL COMPONENTS:

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GVE sympathetic vasomotor fibers from roots L1-5 (cause ejaculation of semen).

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GVE parasympathetic fibers from the sacral outflow S2-4 (cause erection of penis or clitoris).

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GVA sympathetic sensory fibers whose cell bodies are placed in the L1-5 spinal ganglia through lumbar splanchnic nerves.

ROOT

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The vasomotor sympathetic fibers originate from the ventral part of the intermediolateral horn of L1-5 spinal cord segments while the sensory branches have their pseudounipolar cell bodies in the spinal ganglia L1-5, and their roots in the dorsal part of the intermediolateral horn of corresponding spinal cord segments.

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The parasympathetic motor are from the sacral outflow (S2-4).

 

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