Chapter 16 [11th edition] – Study Guide

[note: you can delete the items in red – I will not test you on those items]

 

referred pain

proprioceptive sensations

muscle spindles

tendon organs

joint kinesthetic receptors

primary somatosensory area

sensory signals from L body go to R cerebrum & vice versa

relative size of regions within primary somatosensory area

             are proportional to the number of sensory receptors / body part

primary motor area

relative size of regions within primary motor area

             are proportional to the number of motor units / muscle in the body part

somatic sensory pathways

             first order neuron

             second order neuron

             third order neuron

             posterior column

                           fine touch, stereognosis, conscious proprioception, kinesthesia, weight discrimination, vibration

             lateral spinothalamic

                           pain, thermal sensations

             anterior spinothalamic

                           tickle, itch, pressure, crude touch

             anterior & posterior spinocerebellar

                           proprioception

somatic motor pathways

             lower motor neuron (LMN)

             upper motor neuron (UMN)

             lateral corticospinal

             from motor cortex to skeletal muscle – moves limbs, hands, feet

             anterior corticospinal

             from motor cortex to skeletal muscle – moves axial skeleton

             corticobulbar

                           from motor cortex to skeletal muscle – moves head, neck