[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