Physiology II: Somatosensory System 1 - Primary Sensory Neurones and their Modalities

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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

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Enteroceptive Division

Proprioceptive Division

Exteroceptive Division

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Resting membrane potential is mV, whereras the resting potential of a neuron is mV.

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A is a receptor that responds to potentially damaging stimuli by sending 'threat' signals to the brain

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❌ 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

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Low threshold thermoreceptors

Thermal nociceptors

Chemical nociceptors

Low threshold chemical receptors

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Cutaneous afferent fibres in the fingertips are of a ( high, low ) density of innervation, each fibre having a ( small, large ) receptive field in order to allow a ( high, low ) acuity in terms of sensation.

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Two point discrimination (spacial acuity) in higher in the ( finger tip, forearm ) but lower in the ( forearm, finger tip ), due to the differing sizes of the afferent fibres' receptive fields.

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As receptive field size increases, spatial acuity ( decreases, increases ).

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Which layer of the epidermis contains merkel cells?

Wähle eine der folgenden:

Basal layer
Keratin layer
Granular layer
Prickle cell layer

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❌: 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)

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Merkel cells

Meissner corpuscles

Pacinian corpuscles

Ruffini endings

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Hairless skin is referred to as skin

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( Pacinian corpuscles, Meissner corpuscles, Ruffini endings ) are found in the subcutaneous tissues

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Klicke auf den orangenen Punkt und wähle die korrekte Antwort.

The structure is called a ...

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Each hair unit is innervated by free nerve endings that either wrap around the follicle or run parallel to it. Label these fibres below.

Ziehe eine Antwort zum richtigen orangen Punkt.

Palisade Fibres

Circumferential Fibres

Longitudinal Fibres

	Erstellt von Matthew Coulson vor etwa 6 Jahre

Somatosensory system 1: Primary sensory neurones and their modalities given on 3/5/18

Physiology II: Somatosensory System 1 - Primary Sensory Neurones and their Modalities

Physiology II: Somatosensory System 1 - Primary Sensory Neurones and their Modalities

Frage 1 von 13

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

Klicke und ziehe, um den Text zu vervollständigen.

Erklärung

Frage 2 von 13

Fülle die Lücken, um den Text zu vervollständigen.

Resting membrane potential is mV, whereras the resting potential of a neuron is mV.

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Frage 3 von 13

Fülle die Lücke, um den Text zu vervollständigen

A is a receptor that responds to potentially damaging stimuli by sending 'threat' signals to the brain

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Frage 4 von 13

❌ 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

Klicke und ziehe, um den Text zu vervollständigen.

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Frage 5 von 13

Wähle von der Dropdown-Liste, um den Text zu vervollständigen.

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.

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Frage 6 von 13

Wähle von der Dropdown-Liste, um den Text zu vervollständigen.

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.

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Wähle von der Aufklappliste, um den Text zu vervollständigen.

As receptive field size increases, spatial acuity decreases increases( decreases, increases ).

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Which layer of the epidermis contains merkel cells?

Wähle eine der folgenden:

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❌: 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)

Klicke und ziehe, um den Text zu vervollständigen.

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Frage 10 von 13

Fülle die Lücke, um den Text zu vervollständigen

Hairless skin is referred to as skin

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Frage 11 von 13

Wähle von der Aufklappliste, um den Text zu vervollständigen.

Pacinian corpuscles Meissner corpuscles Ruffini endings( Pacinian corpuscles, Meissner corpuscles, Ruffini endings ) are found in the subcutaneous tissues

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Frage 12 von 13

Klicke auf den orangenen Punkt und wähle die korrekte Antwort.

The structure is called a ...

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Frage 13 von 13

Each hair unit is innervated by free nerve endings that either wrap around the follicle or run parallel to it. Label these fibres below.

Ziehe eine Antwort zum richtigen orangen Punkt.

Erklärung

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

❌ 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 ) density of innervation, each fibre having a ( small, large ) receptive field in order to allow a ( high, low ) acuity in terms of sensation.

Two point discrimination (spacial acuity) in higher in the ( finger tip, forearm ) but lower in the ( forearm, finger tip ), due to the differing sizes of the afferent fibres' receptive fields.

As receptive field size increases, spatial acuity ( decreases, increases ).

❌: 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)

( Pacinian corpuscles, Meissner corpuscles, Ruffini endings ) are found in the subcutaneous tissues