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Penis

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PENIS ANATOMY

When the penis is in a state of erection is serves the male reproductive system as the copulatory organ. Comprising the external male genitalia, the penis and the scrotum are positioned as suspended organs from the perineum. As a sexual organ, the penis will respond to sexual stimulation by becoming filled to capacity with blood. The erectile tissue of the penis is intentionally filled with spaces and materials distinctly designed to house the extra blood flow without permitting it to escape, creating an erection.

At the pubic arch, the penis is held firm to the body via the proximal attached root. This root is intelligently designed to extend posterior to its origin creating both the crus of the penis as well as the bulb of the penis. The bulb of the penis can be located in the urogential triangle within the perineum. Here, it is noticeably attached to the underside of the urogenital diaphragm and surrounded by the bulbocavernosus muscle. The crus is responsible for attaching the penis to the male body via pubic arch and the perineal membrane. The crus is positioned above the bulb and is surrounded by ischiocavernosus muscle.

PENIS STRUCTURE

3 column of fibrous tissue housed within the skin creates that body of the penis. The two equal dorsal masses are referred to as the corpora cavernosa. The septum of the penis is found directly between these two masses. Surrounding the spongy urethra, the corpus spongiosum penis can be found on the lower portion is reference to the other two columns of penile tissue.

The penis exists in either a flaccid or engorged state, depending on nerve function, usually brought about by sexual arousal. In the flaccid position, the penis is prone to trauma or injury, as the pendant position it takes makes it vulnerable to circumstance. This area is extremely sensitive, and painful stimuli can temporarily cripple the male human. Women typically do not sustain injuries to the urethra because by nature the urethra is more protected while males can sustain injury to the penis as well as the urethra. Rupture of the urethra can be caused by the common “straddle position” injury, where significant compression occurs from a forceful drop or blow from a straddling position.

PENIS DIAGRAM

Penis
Image: Penis


The glans of the penis is the termination of the organ. With its distinctive cone shape, formed via the expanded corpus spongiosum, the urethral opening is positioned at the tip of the glans of the penis. This is known as the urethral orifice. The glans of the penis is indicated via a distinctive posterior ridge. This ridge is referred to as the corona glandis. Attached to the skin which covers the glans, vertical tissue folds can be found along the lower surface known as frenulum.

The skin of the penis is devoid of specific elements typically found in skin. Fat cells, hair, and consistent pigmentation are all missing form the penis’ skin. The skin of the penis is also less form fitting, and has an actual loose covering. This skin creates a continuation directly over the glans which can be retracted is left intact. This retractable sheath is known as the foreskin, or prepuce. Many men have had this skin retracted permanently at birth. In Jewish ritual, the foreskin is circumcised, or permanently retracted on the eighth day after birth. Other demoninations who practice this ritual are more likely to proceed on the third or fourth day post partum.

PENIS FUNCTIONS

The penis has a high demand for blood and it receives it supply via the superficial external pudendal branch of the femoral artery as well as internal pudendal branch of the internal iliac artery. The draining of blood occurs through the venous system which follows the same route as supply in reverse. The superficial medial dorsal vein drain the blood flow into the great saphenous vein located in the thigh. The deep median vein drains the remainder of the blood and empties into prostatic plexus.

The penis is highly sensitive and is loaded with tactile sensory receptors. While it is the most sensitive organ on the male human body, the glans is the most sensitive segment of the penis. Sympathetic and parasympathetic nerve fibers innervate the penis in its entirety. Thus, the penis is nearly always responding to tactile stimulation.

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youtube medical movies Penis videos:



Cystoscopy Surgery - Male Penis PreOpĀ® Patient Education Feature
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http://www.youtube.com/v/iwWwD8ku6Js&feature=youtube_gdata
Male Reproductive Model - Upright Model - Penis.avi
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http://www.youtube.com/v/5Y_h9GC_I-0&feature=youtube_gdata

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