Erection, penile

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Erection, penile

Erection, penile

When the penis fills with blood and is rigid. The penis contains two chambers, called the corpora cavernosa, which run the length of the organ, are filled with spongy tissue, and surrounded by a membrane, called the tunica albuginea. The spongy tissue contains smooth muscles, fibrous tissues, spaces, veins, and arteries. The urethra, which is the channel for urine and ejaculate, runs along the underside of the corpora cavernosa. Erection begins with sensory and mental stimulation. Impulses from the brain and local nerves cause the muscles of the corpora cavernosa to relax, allowing blood to flow in and fill the open spaces. The blood creates pressure in the corpora cavernosa, making the penis expand. The tunica albuginea helps to trap the blood in the corpora cavernosa, thereby sustaining erection. Erection is reversed when muscles in the penis contract, stopping the inflow of blood and opening outflow channels.

RELATED TERMS
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Penis
The male sex organ, which consists of a head called glans, and the shaft or body. At the tip of the glans is the urethral opening, through which urine and semen leave the body. The shaft or the body of the penis is made of spongy tissue and blood vessels. And it fills with blood an grows in size (becomes erect) during sexual excitement.

Blood
The life-maintaining fluid which is made up of plasma, red blood cells (erythrocytes), white blood cells (leukocytes), and platelets; blood circulates through the body's heart, arteries, veins, and capillaries; it carries away waste matter and carbon dioxide, and brings nourishment, electrolytes, hormones, vitamins, antibodies, heat, and oxygen to the tissues.

Organ
A structural unit of an animal or plant that serves a specific function.

Tissue
Biological tissue is a group of cells that perform a similar function.The study of tissues is known as histology, or, in connection with disease, histopathology.The classical tools for studying the tissues are the wax block, the tissue stain, and the optical microscope, though developments in electron microscopy, immunofluorescence, and frozen sections have all added to the sum of knowledge in the last couple of decades.

Membrane
A flexible layer surrounding a cell, organelle (such as the nucleus), or other bodily structure. The movement of molecules across a membrane is strictly regulated in both directions.

Albuginea
Tough white fibrous tissue. The tunica albuginea of the testis, for example, is the layer of dense whitish inelastic tissue that surrounds the testis.

Veins
Blood vessels that carry blood from the arms, legs, head and body organs back to the heart.

Arteries
Blood vessels that carry blood away from the heart to the arms, legs, head, body and organs.

Urethra
A narrow tube that transports urine from the bladder to the outside of the body. In males, it also conducts sperm and semen to the outside.

Urine
The waste fluid secreted by the kidneys, transported by the ureters, stored in the bladder, and voided through the urethra.

Ejaculate
The fluid emitted from a man's penis that contains sperm.

Brain
"That part of the central nervous system that is located within the cranium (skull). The brain functions as the primary receiver, organizer and distributor of information for the body. It has two (right and left) halves called ""hemispheres."" "

Local
In the area of the tumor; confined to one specific area.

Contract
A written, dated, and signed agreement between two or more involved parties that sets out any arrangements on delegation and distribution of tasks and obligations and, if appropriate, on financial matters. The protocol may serve as the basis of a contract.

SIMILAR TERMS
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Erectile dysfunction
A man's consistent inability to achieve or maintain an erection during intercourse; commonly known as impotence.

Erection problems
An erection problem is the inability to get or maintain an erection that is firm enough for a man to have intercourse. You may be unable to get an erection at all, or you may lose the erection during intercourse before you are ready. If the condition persists, the medical term is erectile dysfunction.

Erection self-test
This is a test that determines the ability or inability to achieve an erection while sleeping.

PREVIOUS AND NEXT TERMS
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Equinophobia
An abnormal and persistent fear of horses. Sufferers of equinophobia experience undue anxiety even when a horse is known to be gentle and well trained. They usually avoid horses entirely rather than risk being kicked, bitten or thrown. They may also fear other hoofed animals such as ponies, donkeys and mules.

Equol
A substance produced in the intestine as a metabolite of soybeans and soy foods. Equol is a non-steroidal estrogen that acts as an anti-androgen by blocking the hormone dihydrotestosterone. Some people are able to produce equol while others cannot. Equol is chemically unique among the isoflavones (a family of phytoestrogens, plant estrogens). It is the major metabolite of the phytoestrogen daidzein, an isoflavone abundant in soybeans and soy foods.

ER
1. Emergency room. 2. Endoplasmic reticulum. 3. Estrogen receptor. 4. Extended release.

Erb palsy
A form of brachial plexus palsy in which there is paralysis of the muscles of the upper arm and shoulder girdle due to an injury to the roots of fifth and sixth cervical roots or the upper part of the brachial plexus, a network of spinal nerves that originates in the back of the neck, extends through the axilla (armpit), and gives rise to nerves to the upper limb. The brachial plexus is formed by the union of portions of the fifth through eighth cervical nerves and the first thoracic nerve, all of which come from the spinal cord. In Erb palsy, the arm is internally rotated and hangs limply at the side.

ERCP
Endoscopic retrograde cholangiopancreatography.

Erection, penile

ERG
Electroretinography.

Ergophobia
An abnormal and persistent fear of work. Sufferers of ergophobia experience undue anxiety about the workplace environment even though they realize their fear is irrational. Their fear may actually be a combination of fears, such fear of failing at assigned tasks, fear of speaking before groups at work, or fear of socializing with co-workers.

Ergot
Ergot could be called a "cereal killer" for it comes from cereals such as rye and wheat and is quite capable of killing someone. A fungus (Claviceps purpurea) that contaminates rye and wheat produces substances (alkaloids) termed ergotamines. Ergotamines constrict blood vessels and cause the muscle of the uterus to contract. They have been much used and been very useful for the treatment of migraine. They have also been used and misused as abortifacients (agents of abortion).

Ergotism
Ergotism could be called a "cereal killer" for its cause, ergot, comes from cereals such as rye and wheat and is quite capable of killing someone. A fungus (Claviceps purpurea) that contaminates rye and wheat produces substances (alkaloids) termed ergotamines.

Erosion
An erosion is an eating away of a surface.

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This dictionary contains 25007 terms.

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