Skin perception - receptive field Flashcards
What is sending information about the internal ans external environment to the CNS?
The afferent division of the peripheral nervous system.
What is a visceral afferent?
Incoming pathway for subcontcious information derived from the internal organs (viscera –> bp, CO2 conc.)
What is sensorz afferent?
Input that reaches the level of concious awareness
What is somatic sensation?
sensory input from the body surface
What is proprioreception?;
sensation from the muscles, joint and middle ear
What is special senses?
Hearing, taste, vision, smell
What does the sensors of the somatosensoric system do?
Enables communication between the internal and the external environment particularly receptors to touch, pain ,heat and cold.
What creates the general surface feeling?
Integration of stimuli from different receptors evaluated by the CNS
What is a receptive field?
A limited region where each somatosensory neuron responds to stimulus information
The smaller the magnetic field in a region……
the greater is the discriminative ability (acuity)
The receptor at the site of the most intense stimulation is…
activated to the greatest extent
What happens to the surrounding receptors of a highly stimulated area?
they are stimulated to a lesser degree
What is lateral inhibition?
The most intensely activated receptor pathway halts transmission of impulses in the less intensely stimulated pathway
What facilitates the location of the site of stimulation?
The lateral inhibition
How does the facilitation of location within the CNS work?
Blockage of weaker input increases the contrast and the stimulus can be presisely located.
