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Corticaltectal pathway
Corticaltectal pathway Pathway from the cortex to the superior colliculi.
RELATED TERMS--------------------------------------
Cortex
The outer layer of the cerebrum, densely packed with nerve cells.
Superior
The anatomical term for "above". i.e. the head is superior to the shoulder. Typically used in humans only. See Cranial/Caudal/Inferior.
SIMILAR TERMS--------------------------------------
Cort-dome
Cort-dome 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): hydrocortisone.
Cortalone
Cortalone 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): prednisolone.
Cortan
Cortan 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): prednisone.
Cortef
Cortef 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): hydrocortisone.
Cortef acetate
Cortef acetate 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): hydrocortisone acetate.
Cortenema
Cortenema 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): hydrocortisone.
Cortex
The outer layer of the cerebrum, densely packed with nerve cells.
Cortex, adrenal
The outer portion of the adrenal gland located on top of each kidney. The adrenal cortex produces steroid hormones which regulate carbohydrate and fat metabolism and mineralocorticoid hormones which regulate salt and water balance in the body.
Cortical
Having to do with the cortex, the outer portion of an organ.
Cortical Blindness
A person with cortical blindness will have normal eyes and normal optic nerves but, nevertheless, will not be able to see. The cause of the blindness is with the cortex or surface of the brain that contains 32 or more sites for visual information processing. More recently, the preferred term for such individuals is cortical visual impairment, because many people will not be totally blind but will exhibit unusual visual losses; for example, they may be blind to stationary objects but be able to see moving objects.
Cortical blindness
Blindness due to loss or injury to the visual cortex, that section of the cerebral cortex responsible for vision, as through a stroke or traumatic brain damage.
Cortical magnification factor
Defined as millimeters of cortex per degree of visual angle.
Corticoids
Substances similar to the hormone of the adrenal glands called cortisone; corticoids are differentiated into two groups – mineralocorticoids and glucocorticoids applied both locally and systemically, mainly as anti-phlogistics, immunosuppressives, anti-asthmathics or in the treatment of an allergy.
Corticosteroid
Hormones produced by the adrenal gland which are important to almost every function of cells and organs. They are divided into two groups: glucocorticoids and mineralocorticoids. Glucocorticoids regulate protein, carbohydrate, and fat metabolism. Mineralocorticoids regulate electrolyte balances.
Corticosteroid allergy
A delayed allergic reaction to corticosteroid (drugs similar to cortisone). This occurs in 1-4% of people who use corticosteroids for asthma or other allergic diseases. A positive patch test to a corticosteroid means the patient cannot use that particular steroid. Although cross allergy between corticosteroids is common, such patients usually can tolerate another corticosteroid.
Corticosteroid drugs
Anti-inflammatory drugs that interfere with the immune system, suppress it and thereby dampen the inflammatory overreaction. They can be used to treat a number of allergic diseases - e.g. allergic rhinitis, eczema and rheumatoid arthritis. Corticosteroid drugs come as creams, inhalants, tablets and eye drops.
Corticosteroid hormones
Hormones produced by the adrenal glands.
Corticosteroids
Sometimes referred to just as 'steroids'. Hormones (which occur naturally) which have a variety of actions when given therapeutically. Usually administered for their anti-inflammatory effect. Their use is limited by unwanted side-effects which may sometimes be serious.
Corticotropin
Corticotropin 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): corticotropin.
Corticotropin-releasing hormone
A hormone made by the hypothalamus that stimulates the release of corticotropin by the anterior pituitary gland. Corticotropin-releasing hormone is abbreviated and often referred to as CRH.
Corticotropin-Releasing Hormone (CRH)
The hormone released from the hypothalamus. It interacts with the pituitary to produce ACTH. This hormone uses cyclic AMP for its second messenger.
Cortifoam
Cortifoam 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): hydrocortisone acetate.
Cortisol
The hormone released from the adrenal glands in response to stress or low blood glucose. Its primary mode of action in times of stress is to shut down eicosanoid synthesis. Its synthesis in the adrenal gland requires the second messenger, cyclic AMP.
Cortisone
An adrenocorticoid hormone, a naturally occurring hormone made by and secreted by the adrenal cortex, the outer part (the cortex) of the adrenal gland.
Cortisone acetate
Cortisone acetate 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): cortisone acetate.
Cortisporin
Cortisporin 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): bacitracin zinc; hydrocortisone; neomycin sulfate; polymyxin b sulfate.
Cortone
Cortone 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): cortisone acetate.
Cortril
Cortril 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): hydrocortisone.
Cortrophin-zinc
Cortrophin-zinc 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): corticotropin-zinc hydroxide.
Cortrosyn
Cortrosyn 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): cosyntropin.
PREVIOUS AND NEXT TERMS--------------------------------------
Concentric field
A receptive field divided into an inner circular region and an outer ring-shaped region. Light falling in each of the two regions has opposite effects on the response of the cell.
Cone opsin
Light absorbing molecule in cone cells.
Contrast sensitivity function
The reciprocal of the threshold contrast required to obtain a criterion response from a cell or a human subject as a function of spatial frequency. Falls off in sensitivity as the spatial frequency of the test pattern increases.
Coplanar ratio hyphothesis
An hypothesis by Gilchrist in which the visual system does not use retinal contrasts to determine relative lightnesses but uses depth information to determine which regions are at the same depth (coplanar) and uses their contrasts to deteremine the lightness perceived. This hypothesis has come under recent attack.
Correspondence problem
In Stereopsis: the challenge of matching elements in one eye with elements in another eye. Also known as the Matching Problem. In Motion:
the challenge of matching moving elements in one frame with elements in a succeeding frame (especially true of random dot cinematograms).
Corticaltectal pathway
Cortical magnification factor
Defined as millimeters of cortex per degree of visual angle.
CPD
Cycles per degree of visual angle. The human limit is about 30cpd in the fovea for an individual with 20/20 vision.
Critical flicker frequency (CFF)
The frequency of flicker where the alternating levels of brightness are seen as a single level. The frequency is dependent on brightness levels and retinal location.
Cytochrome oxidase
Histochemical method. Indicator of functional state of neurons as brain derives energy from oxidase metabolism. Used in the discovery of blobs in the visual cortex.
Caseous
Having a consistency like that of cottage cheese.
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