PHY2011 Lecture Notes - Lecture 18: Mechanoreceptor, Golgi Tendon Organ, Proprioception

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20 Jun 2018

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Week 7 L1 (T4L5) -Somatic Senses 1 (Fine touch and body position)

Exteroception -information about the external world

Proprioception -information about position and movement of limbs/body in space

Interoception -information about internal organs

Class Discriminative Non-discriminative

Sub-class Mechanoreception

-fine touch

Proprioception Mechanoreception

-affective touch

Nociception (pain)

Origin Cutaneous Cutaneous &

Deep (muscles &

joints)

Cutaneous & Deep Cutaneous & Deep

Type 1 sensory systems -no specialised receptor cells like hearing and vision

Ends of nerve fibres are modified to be specialised

Somatosensory receptors

oEndings of nerve fibres -identified by location

Meissner’s corpuscles

- Replaced by follicle receptors in hairy skin

Pacinian Corpuses

Merkel’s disks

oMeissner’s and Merkel’s near skin surface, Pacinian deep

oAll mechanoreceptors

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