T2: SENSORY INFORMATION Flashcards
What structure recognizes a stimulus in the internal or external environment of an organism and converts into an AP?
Sensory Receptor
T or F. PNS carries sensory (afferent) information to CNS.
True
A sense of the relative position of neighboring parts of the body without the use of vision is known as?
Proprioception
Define the Romberg’s Test.
A test of proprioception receptors and pathway function
Define Exteroception.
Perception of the outside world
Define Interoception.
Perception of bodily sensations
Information about the internal and external environment reaches the CNS in what form?
AP/Nerve Impulses
A decreased CNS response to a repeated stimulus is termed as?
Habituation
An increased response to a repeated stimulus is termed as?
Sensitization
T or F. ALL unipolar neurons are sensory (afferent) type neurons
True
Describe a Peripheral Axon from a Unipolar Neuron.
Associated with a sensory receptor
Describe a Central Axon from a Unipolar Neuron.
Enters the CNS
When each sensory receptor responds to one particular form of energy, it is termed as?
Adequate Stimulus
When a neuron is in the process of sending a nerve impulse, it is termed as?
Firing/Depolarizing
Receptors that respond to change are called?
Fast Adapting Receptors
Describe Weber’s Law.
Change needed to notice a difference between two stimuli is proportional to the original intensity of the stimulus
A defined area in the periphery receiving input is called?
Receptive Field
When a stimuli falls out of the Receptive Field, it will be unable to affect the receptor, this area is called?
Receptive Field of the Receptor
The ability to locate the site of stimulation and to detect the neighbouring stimuli are separate is called?
Spatial Discrimination
Describe Dermatome.
An area of skin with a combination of the receptive field of the sensory axons originating from a single nerve
Which spinal nerve supplies the lateral shoulder/arm dermatome?
C5
Which spinal nerve supplies the thumb/index finger dermatome?
C6
Which spinal nerve supplies the middle finger dermatome?
C7
Which spinal nerve supplies the digiti minimi dermatome?
C8
Which spinal nerve supplies the medial elbow dermatome?
T1
What is the Thoracic Dermatome Key Landmarks for the intercostal nerve?
T2-T12
What is the Thoracic Dermatome Key Landmarks going across the umbilicus?
T10
What is the Thoracic Dermatome Key Landmarks going across the upper edge of the pubic bone?
T12
Where are Cutaneous Receptors found?
Dermis/Epidermis
Where are Meissner corpuscles and Merkel cells found?
Superficial layer of glabrous skin (fingertips/lips) - detects discriminative touch
What is sensitive to skin stretch. They monitor slippage of objects, allowing modulation of grip
Ruffini Corpusles
What detects “deep touch” (pressure), found in the subcutaneous tissue.
Pacinian Corpuscles
What are multi-layered capsules with branched nerve endings, helps during the feeling of extreme cold
Bulbs of Krause
Unmyelinated terminal branches of the neuron is called?
Naked Nerve Endings
Which receptor responds to ‘light’?
Photoreceptors
Which receptor responds to ‘chemical stimuli’?
Chemoreceptors
Which receptor responds to ‘temperature’?
Thermoreceptors
Which receptor responds to ‘mechanical stress’?
Mechcanoreceptors
