VAGINAL NERVES

 

ORIGIN: Inferior hypogastric plexus and uterovaginal plexus.

COURSE/DISTRIBUTION: These nerves take origin from the inferior hypogastric plexus and also the uterovaginal plexus, and accompany the vaginal arteries to the vaginal mucosa and wall. They also supply bulb of vestibule, clitoris, greater vestibular glands and the urethra. These nerves contain mainly vasodilator parasympathetic fibers from the sacral outflow. And presumably aid the process of sexual climax in the female as they do in the male. Their supply would also be mainly to the bulbospongiosus as it is the case for the male, since the it is the muscle of sexual climax. In the male, it helps the climax process of ejaculation of semen and in the female, it helps the process of rhythmic contraction of pelvic organs, which heralds the climax, in this case, the rhythmic contraction of the vagina and more importantly, the involuntary sphincter of the vagina, which is the bulbospongiosus. Its tactile sensory function is carried into the vaginal nerves via the GVA sympathetic fibers. They cause the arousal and build up of excitation, which culminates in the motor function of climax that are wholly autonomic and affects the following organs

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Breasts- nipple erection

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Clitoris- erection of shaft

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Bartholin glands- secretion

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Vulva- increase in size of labia

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Vagina- secretion of vaginal fluid and increase in length with recordable rhythmic contraction in the outer third of the vagina from 4-10 contractions, similar to the same rhythmic contraction following ejaculation and both mediated by the same bulbospongiosus. The contractions (whether male or female) have about 8/10th of a second between them.

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Cervix- pulled upwards and backwards with the uterus

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Uterus  - pulled upwards into the false pelvis probably with the help of the uterine ligaments with regular rhythmic contraction throughout the orgasmic response.

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Muscles- generalized muscular contractions, which sometimes resembles convulsions, are produced involuntarily and are therefore not under somatic control. They may be considered to be under some unknown autonomic generalized response probably originating from the hypothalamic control centers for autonomic function, just as other emotional reactions like weeping, or aggressive behavior.

 BRANCHES:

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Vaginal mucosal and muscular branches

 FUNCTIONAL COMPONENTS:

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GVE sympathetic vasomotor fibers from roots L1-5

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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 their 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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