Ischiocavernosus muscle

ischiocavernosus
The ischiocavernosus muscle or erectores penis by old Anatomists, is a muscle just below the surface of the perineum, present in both men and women.wikipedia
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Erection

erectpenile erectionerect penis
It helps (in males) stabilize the erect penis and (in females) tense the vagina during orgasm.
The arteries dilate causing the corpora cavernosa of the penis (and to a lesser extent the corpus spongiosum) to fill with blood; simultaneously the ischiocavernosus and bulbospongiosus muscles compress the veins of the corpora cavernosa restricting the egress and circulation of this blood.

Perineum

perinealperineal bodyanogenital
The ischiocavernosus muscle or erectores penis by old Anatomists, is a muscle just below the surface of the perineum, present in both men and women.

Ischium

ischiainferior ramus of the ischiumischial
It arises by tendinous and fleshy fibers from the inner surface of the tuberosity of the ischium, behind the crus penis; and from the rami of the pubis and ischium on either side of the crus.
Below, it is bounded by a sharp ridge that provides attachment to a falciform prolongation of the sacrotuberous ligament, and, more anteriorly, gives origin to the transverse perineal and ischiocavernosus muscles.

Perineal artery

perineal vesselsTransverse perineal artery
The perineal artery (superficial perineal artery) arises from the internal pudendal artery, and turns upward, crossing either over or under the superficial transverse perineal muscle, and runs forward, parallel to the pubic arch, in the interspace between the bulbospongiosus and ischiocavernosus muscles, both of which it supplies, and finally divides into several posterior scrotal branches which are distributed to the skin and dartos tunic of the scrotum.

Pudendal nerve

Pudendalinternal pudendal nervenerve
Branches also innervate muscles of the perineum and the pelvic floor; namely, the bulbospongiosus and the ischiocavernosus muscles respectively, the levator ani muscle (including the Iliococcygeus, pubococcygeus, puborectalis and either pubovaginalis in females or puboprostaticus in males) the external anal sphincter (via the inferior anal branch), and male or female external urethral sphincter.

Bulbospongiosus muscle

bulbospongiosusbulbocavernosusbulbocavernosus muscle
Its fibers diverge; the most posterior form a thin layer, which is lost on the inferior fascia of the urogenital diaphragm; the middle fibers encircle the bulb and adjacent parts, of the corpus cavernosum urethrae, and join with the fibers of the opposite side, on the upper part of the corpus cavernosum urethrae, in a strong aponeurosis; the anterior fibers, spread out over the side of the corpus cavernosum penis, to be inserted partly into that body, anterior to the Ischiocavernosus, occasionally extending to the pubis, and partly ending in a tendinous expansion which covers the dorsal vessels of the penis.

Vagina

birth canalvaginalvaginal opening
It helps (in males) stabilize the erect penis and (in females) tense the vagina during orgasm.

Crus of penis

crus peniscruraCrura of penis
Ischiocavernosus compresses the crus penis, and retards the return of the blood through the veins, and thus serves to maintain the organ erect.

Vulva

pudendal cleftexternal female genitaliacunnus
Other muscles of the urogenital triangle support the vulvar area and they include the transverse perineal muscles, the bulbospongiosus, and the ischiocavernosus muscles.

Human sexuality

sexualitysexualsex
The root is surrounded by two muscles; the bulbocavernosus muscle and the ischiocavernosus muscle, which aid urination and ejaculation.

Pelvis

pelvicpelvic girdlehip
Ischiocavernosus squeezes blood into the corpus cavernosum penis and clitoridis.

Root of penis

root of the penis
Each crus is covered by the Ischiocavernosus muscle, while the bulb is surrounded by the Bulbospongiosus.

Fascia of perineum

deep perineal fasciafascia of the perineumGallaudet's fascia
The muscles surrounded by the deep perineal fascia are the bulbospongiosus, ischiocavernosus, and superficial transverse perineal.

Onuf's nucleus

Onuf’s nucleus
Onufrowicz also proposed that Onuf's nucleus controlled the ischiocavernosus and bulbocavernosus muscles which function in penile erection and ejaculation in males.

Deep branch of the perineal nerve

These include the superficial transverse perineal muscle, bulbospongiosus, ischiocavernosus, and Sphincter urethræ.

Clitoris

clitoralclitoral glansglans clitoridis
The ischiocavernosus and bulbocavernosus muscles, which insert into the corpora cavernosa, contract and compress the dorsal vein of the clitoris (the only vein that drains the blood from the spaces in the corpora cavernosa) and the arterial blood continues a steady flow and, having no way to drain out, fills the venous spaces until they become turgid and engorged with blood.

Levator ani

pubococcygeus musclepubococcygeuspuborectalis
These exercises also serve to contract, among others, the ischiocavernosus, bulbospongiosus, and cremaster muscle in men, as voluntary contraction of the pubococcygeus muscle also engages the cremasteric reflex, which lifts the testicles up, although this does not occur in all men.

Clitoral erection

clitorisclitoral swellingerecting the clitoral glans
The ischiocavernosus and bulbocavernosus muscles contract to compress the dorsal vein of the clitoris to stop drainage of the clitoris, trapping the blood.

Kegel exercise

Kegel exercisespelvic floor exerciseKegel
The names of the perineal muscles are: Ischiocavernosus (erection), bulbocavernosus (ejaculation), external sphincter of the anus, striated urethral sphincter, transverse perineal, levator of the prostate, and puborectalis.

Crus of clitoris

clitoral cruraclitoral cruscrura
The clitoral crura are each covered by an ischiocavernosus muscle.