How many corpus spongiosum

The significance of polsters smooth muscle projections into the blood vessel lumen remains controversial. Occlusion of venous drainage from the corpora cavernosa is both passive due to increased corpus cavernosum pressure and active. Relaxation of trabecular smooth muscle may also modify blood flow through the corpora cavernosa.

Abstract Erection of the penis results from increase in blood flow into the corpora. Biomedical Citizen Science. Director's Message. Budget Proposal. Stories of Cancer Research. Driving Discovery. Highlighted Scientific Opportunities.

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Advisory Board Meetings. Social Media Events. The cavernous artery deep artery fo the penis usually arises form the penile artery, but may originate from the accessory pudendal. It runs lateral to the cavernous vein along he dorsomedial surface of the crura to enter the erectile tissue where the two corpora fuse; it then continues in the center of the corpora cavernosa.

The dorsal artery of the penis is the termination of the penile artery; it runs over the resepctive crus and then along the dorsolateral surface of the penis as far as the glans between the dorsal vein medially and dorsal nerve of the penis laterally.

This artery has tortuous configuration to accommodate for elongation during erection. It may arise from the accessory internal pudendal artery within the pelvis, and thus may be at risk during radical pelvic surgery. On its way to the glans, it gives off circumflex arteries to supply the corpus spongiosum.

Distally, the dorsal artery runs in a ventrolateral position near the sulcus prior to entering the glans. The frenular branch of the dorsal artery curves around each side of the distal shaft to enter the frenulum and glans ventrally. Arterial blood is conveyed to the erectile tissues in the deep arterial system by means of dorsal, cavernous and bulbo-urethral arteries.

The cavernous artery deep artery of the penis gives off multiple helicine arteries among the cavernous spaces within the center of the erectile tissue. Most of these open directly into the sinusoids bounded by trabecular, but a few helicine arteries terminate in capillaries that supply the trabeculae.

The petiniform septum distally provides communication between the two corpora. The emissory veins at the periphery collect the blood from the sinusoids through the subalbugineal venous plexuses and empty it into the circumflex veins which drain into the deep dorsal vein. With erection, the arteriolar and sinusoidal walls relax secondary to neurotransmitters and the cavernous spaces dilate, enlarging the corporal bodies and stretching the tunica albuginea.

The venous tributaries between the sinusoids and the subabugineal venous plexus are compressed by the dilating sinusoids and the stretched tunica albuginea. The venous drainage system consists of three distinct groups of veins—superficial, intermediate and deep. The intermediate system consists of the deep dorsal vein and circumflex veins that drain the glans, corpus spongiosum and distal two-thirds of the corpora cavernosa.

The veins leave the glans via a retrocoronal plexus to join the deep dorsal vein that runs in the groove between the corpora.

The latter passes through a psace in the suspensory igament and between the puboprostatic ligament and drains into the internal iliac veins.

The deep drainage system consists of the cavernous vein, bulbar vein and crural veins. Blood from the sinusoids from the proximal third of the penis, carried by emissary veins, drains directly into the cavernous veins at the periphery of the corpora cavernosa. The two cavernous veins join to form the main cavernous vein that lies under the cavernous artery and nerves. The cavernous vein runs between the bulb and the crus to drain into the internal pudendal vein; it forms the main venous drainage of the corpora cavernosa.

The crural veins arise from the dorsolateral surface of each crus and unite to drain into the internal pudendal vein. The bulb is drained by the bulbar vein, which drains into the prostatic plexus. The lymphatics from the penile skin and prepuce run proximally towards the presymphyseal plexus and then divide to right and left trunks to join the lymphatics from the scrotum and perineum.

They run along superficial external pudendal vessels into the superficial inguinal nodes, especially the superomedial group. The lymphatics from the glans and penile urethra drain into deep inguinal nodes, presymphyseal nodes and, occasionally, into external iliac nodes.

Somatic innervation arises from sacral spinal segments S via the pudendal nerve. The perineal branch of the pudendal nerve supplies the posterior part of the scrotum and the rectal nerve to the inferior rectal area.

Tunica externa c. Tunica media d. Tunica intima e. Tunica albuginea. What is another term for the corpus cavernosum urethrae? Corpora cavernosa b. Corpus spongiosum c. Urethra d. Corpus cavernosum clitoridis e Erectile tissue. The corpus spongiosum is also called the corpus cavernosum urethrae. The corpus cavernosum clitoridis is in the female. The urethra is a muscular tube that runs from the bladder.

It transports both urine and semen. How many corpus spongiosum are there? What is the mature sperm cell? Table of Contents. Histology Games. Histology Entertainment. Learn Histology. Histology Shopping.