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Sessile polyp
Sessile polyp A polyp with a broad base (sessile).
RELATED TERMS--------------------------------------
Polyp
A growth that projects from the lining of mucous membrane, such as the intestine.
Base
A chemical compound that either donates hydroxide ions or absorbs hydrogen ions when dissolved in water. Bases and acids are referred to as opposites because the effect of an acid is to increase the hydronium ion concentration in water, whereas bases reduce this concentration. Arrhenius bases are water-soluble and always have a pH greater than 7 in solution.
SIMILAR TERMS--------------------------------------
Sessile
Attached by a broad base.
PREVIOUS AND NEXT TERMS--------------------------------------
Stimulus equivalence
If the stimulus controlling behavior is a pattern of light on the retina than an infinite number of images are equivalent in their effects.
Superior colliculus
A nucleus in the midbrain that coordinate visual, somatic and auditory information adjusting movements of the head and eyes towards a stimulus. contains four types of maps, a visual map, a map of the body surface, a map for sound in space and a motor map. Receives inputs from the retina (via the optic tract), the visual cortex, the somatosensory system and auditory systems. Mediates saccadic eye movements. Is the source of two major descending tracts, the tectospinal tract and the tectopontine tract in addition to regions of the brain stem controlling eye movements.
Superior temporal polysensory area (STP)
Area of monkey cortex. Virtually all cells respond to visual stimuli but some also activated by somatosensory and auditory input. Large receptive fields covering most of the visual field with no visuotopic order. Show radial or opponent direction selectivity. Some cells have fields responding to motion either towards the area centralis or away from it. Others show selective responses for object moving in depth, producing either looming or contracting pattern of motion in the field. Seem to be sensitive to information about peripheral optic flow.
Spermatogenesis
Formation of sperm.
Splenomegaly
Enlargement of the spleen.
Sessile polyp
Saponification
The hydrolysis of a fat by alkali with the formation of a soap and glycerol.
Scleroma
A hardened patch of skin or mucous membrane.
Serosa
Any serous membrane.
Serpiginous
Having a wavy border.
Serrated
Having a saw-like edge
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