Lab 8: Somatic Senses単語カード | Quizlet

Exteroceptors

used to detect changes in the external environment

cutaneous receptors and taste, olfaction, vision and hearing

Pain and temperature receptors have _______ ________ endings

free nerve endings

Interoceptors

used to detect changes in the internal environment

visceroreceptors (internal pain receptors, baroreceptors, osmoreceptors)

Proprioceptors:

Adequate stimulus

most sensitive particular type of stimulus

threshold is lower for adequate than others because so sensitive to it

Law of specific nerve energies

the sensory pathway carries info from sensory receptor to specific area of brain where is interpreted the interpretatino of stimulus is determined by final destination inbraine

First order neuron

afferent neuron that carries AP from sensory receptor in PNS to CNS synapses with 2nd order

2nd order neuron

contained w/in CNS and carries AP to thalamus, where synapses with 3rd order

DECUSSATES

3rd order neuron

contained w/in CNS, and carries AP to somatosensory cortex.

perception/integration is contralateral

second order neuron decussates

Posterior columns

specific ascending

carry info regarding discriminatory touch, vibration, conscious muscle sense, join movement (proprioception)

Lateral spinothalamic tracts

non specific ascending

carry info regarding pain and temp.

Anterior spinothalamic tracts

non specific ascending

carry info regarding light touch and light pressure