The Somatosensory System can be subdivided into 3 parts: ❌: Registers cutaneous sensation by numerous receptors ❌: Monitors posture and movement via receptors in muscles, tendons and joints ❌: Reports upon the internal state of the body
Resting membrane potential is mV, whereras the resting potential of a neuron is mV.
A is a receptor that responds to potentially damaging stimuli by sending 'threat' signals to the brain
❌ mediate cold, cool, indifferent, warm and hot sensations ❌ respond to extreme degrees of heat (both hot and cold) ❌ responds to potentially damaging substances in tissue
Cutaneous afferent fibres in the fingertips are of a high low( high, low ) density of innervation, each fibre having a small large( small, large ) receptive field in order to allow a high low( high, low ) acuity in terms of sensation.
Two point discrimination (spacial acuity) in higher in the finger tip forearm( finger tip, forearm ) but lower in the forearm finger tip( forearm, finger tip ), due to the differing sizes of the afferent fibres' receptive fields.
As receptive field size increases, spatial acuity decreases increases( decreases, increases ).
Which layer of the epidermis contains merkel cells?
Basal layer
Keratin layer
Granular layer
Prickle cell layer
❌: Sensitive to sustained pressure, texture and edges of objects ❌: Sensitive to stroking, flutter & low frequency vibration ❌: Very sensitive to higher frequency vibration, act as event detectors during object manipulation ❌: Sensitive to shearing forces (e.g. drag)
Hairless skin is referred to as skin
Pacinian corpuscles Meissner corpuscles Ruffini endings( Pacinian corpuscles, Meissner corpuscles, Ruffini endings ) are found in the subcutaneous tissues
The structure is called a ...
Each hair unit is innervated by free nerve endings that either wrap around the follicle or run parallel to it. Label these fibres below.
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