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| This glossary contains: 19186 medical terms |
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Photoreceptor
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Photoreceptor A light sensitive neuron. Photoreceptors interact with light which produces changes in their electrical properties which are communicated to other neurons. They constitute the first stage in the physiological process which underlies vision. The human retina, like the retina of most vertebrates, contains two broad classes of photo-receptors, rods and cones.
RELATED TERMS--------------------------------------
Neuron
A cell specialized to conduct and generate electrical impulses and to carry information from one part of the brain to another.
Vision
The sense of sight.
Retina
A membrane lining the inside of the back of the eye that contains light-sensitive nerve cells that convert focused light into nerve impulses, making vision possible.
Rods
The rods are the visual cells of the retina that are important for night vision and peripheral vision. The rods are the first affected in rod-cone degenerations such as RP.
SIMILAR TERMS--------------------------------------
Photocoagulation
Using a special strong beam of light (laser) to seal off bleeding blood vessels such as in the eye. The laser can also burn away blood vessels that should not have grown in the eye. This is the main treatment for diabetic retinopathy.
Photodynamic radiation therapy
A light sensitive drug is given through a vein and concentrates in the tumor. Then, during a surgical procedure, a special light activates the drug. The activated drug kills tumor cells.
Photofrin
Photofrin is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): porfimer sodium.
Photophobia
Severe discomfort to bright lights. Usually a symptom of eye disease, such as glaucoma, in an infant or retinal disease in a child or adult. Sometimes treated with dark sunglasses.
Photopic
Bright light conditions where only the cones are functional.
Photoreceptor mosaic
The spacial arrangement of photoreceptors in the retina.
Phototherapy
The use of ultraviolet light to treat newborns with jaundice.
PREVIOUS AND NEXT TERMS--------------------------------------
Putative father
Males alleged or reputed to be biological fathers of illegitimate children.
Pineal
The gland located within the brain that synthesizes melatonin.
Pituitary
The gland from which a number of hormones are released into the bloodstream. These hormones include growth hormone, ACTH, B-lipocortin (the precursor to B-endorphorin), FSH, LH, and TSH.
Progesterone
A hormone produced in response to luteinizing hormone (LH) released from the pituitary gland. It is required to flush out the uterus if an egg is not fertilized. It is also useful for stimulating the growth of new bone mass.
Progestins
Synthetic analogs of progesterone that have some of the properties of natural progesterone.
Photoreceptor
Paternity test
A test based on blood groups to determine whether a particular man could be the biological father of a particular child; negative results prove he was not the father but positive results show only that he could be.
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.
Penis enlargement treatment
Treatments aimed at increasing penile length or girth also known as penile augmentation. They can be either non-surgical treatment or surgical treatments.
Phentermine
A sympathomimetic amine used in attack preparations as a vasoconstrictor and bronchodilator, usually in combination with an antihistamine drug. An appetite suppressant that disrupts the transmission of signals from the neurotransmitters and is used in the management of obesity.
Pyelonephritis
Infection of the kidneys. A severe infection favoured by a slowing in the flow of urine (urinary stasis) between the kidney and bladder, through a long duct called the urethra. This stasis is naturally increased by pregnancy (atonicity of ducts), but the absence of any blockage in the urinary tract or reflex from the bladder and urethras (vesicourethral reflux) should be ascertained.
RELATED TERMS--------------------------------------
Neuron
A cell specialized to conduct and generate electrical impulses and to carry information from one part of the brain to another.
Vision
The sense of sight.
Retina
A membrane lining the inside of the back of the eye that contains light-sensitive nerve cells that convert focused light into nerve impulses, making vision possible.
Rods
The rods are the visual cells of the retina that are important for night vision and peripheral vision. The rods are the first affected in rod-cone degenerations such as RP.
SIMILAR TERMS--------------------------------------
Photocoagulation
Using a special strong beam of light (laser) to seal off bleeding blood vessels such as in the eye. The laser can also burn away blood vessels that should not have grown in the eye. This is the main treatment for diabetic retinopathy.
Photodynamic radiation therapy
A light sensitive drug is given through a vein and concentrates in the tumor. Then, during a surgical procedure, a special light activates the drug. The activated drug kills tumor cells.
Photofrin
Photofrin is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): porfimer sodium.
Photophobia
Severe discomfort to bright lights. Usually a symptom of eye disease, such as glaucoma, in an infant or retinal disease in a child or adult. Sometimes treated with dark sunglasses.
Photopic
Bright light conditions where only the cones are functional.
Photoreceptor mosaic
The spacial arrangement of photoreceptors in the retina.
Phototherapy
The use of ultraviolet light to treat newborns with jaundice.
PREVIOUS AND NEXT TERMS--------------------------------------
Putative father
Males alleged or reputed to be biological fathers of illegitimate children.
Pineal
The gland located within the brain that synthesizes melatonin.
Pituitary
The gland from which a number of hormones are released into the bloodstream. These hormones include growth hormone, ACTH, B-lipocortin (the precursor to B-endorphorin), FSH, LH, and TSH.
Progesterone
A hormone produced in response to luteinizing hormone (LH) released from the pituitary gland. It is required to flush out the uterus if an egg is not fertilized. It is also useful for stimulating the growth of new bone mass.
Progestins
Synthetic analogs of progesterone that have some of the properties of natural progesterone.
Photoreceptor
Paternity test
A test based on blood groups to determine whether a particular man could be the biological father of a particular child; negative results prove he was not the father but positive results show only that he could be.
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.
Penis enlargement treatment
Treatments aimed at increasing penile length or girth also known as penile augmentation. They can be either non-surgical treatment or surgical treatments.
Phentermine
A sympathomimetic amine used in attack preparations as a vasoconstrictor and bronchodilator, usually in combination with an antihistamine drug. An appetite suppressant that disrupts the transmission of signals from the neurotransmitters and is used in the management of obesity.
Pyelonephritis
Infection of the kidneys. A severe infection favoured by a slowing in the flow of urine (urinary stasis) between the kidney and bladder, through a long duct called the urethra. This stasis is naturally increased by pregnancy (atonicity of ducts), but the absence of any blockage in the urinary tract or reflex from the bladder and urethras (vesicourethral reflux) should be ascertained.
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This dictionary contains 19186 terms.
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