Vocab
part of the nervous system that detects touch, pain, temperature, pressure, hair movement, proprioception, and vibrations
somatosensory system
proprioception and mechanoreception including a-alpha and a-beta axons (thickest and fastest)
dorsal column pathway
perception of somato sensations (usually pain) in missing limbs
Somatosensory receptors are attached to ? found throughout the skin, muscles, and tendons
primary somatosensory neurons
this is part of the skin that changes its activity whenever its stimulated
two general types of somatosensory receptors; one has a cap of connective tissue over the receptor and one has no cap of connective tissue
encapsulated and free receptors
primary somatosensory neuron axons project to and synapse with secondary somatosensory neurons in the ?
dorsal column nuclei
pain that is felt in one part of the body that is caused by pain or injury to another part of the body
referred pain
axons of somatosensory neurons travel along ? through ? to the spinal cord. The soma of these neurons are found in the ?
spinal nerves, dorsal root, DRG
? field is the field with high density like around the hands and mouth. (very sensitive parts of the body)
small receptive field
these type of receptors detect physical distortions in the skin, muscles, and joints. there are 6 different types
mechanoreceptors
secondary somatosensory neurons along the spinothalamic tract project to and synapse with tertiary neurons in the ?
VPL thalamus
autoimmune disease where bodys immune system attacks nicotinic Ach receptors. this interferes with normal muscle contractions and causes severe weakness
myasthenia gravis
these neurons are intermediate in diameter, have myelin, mechanoreception info, and are intermediate speed 3/4.
A-beta neurons
neurons with the most activity from stimuli inhibition neighboring neurons only slightly excited by stimuli
lateral inhibition
what are the 3 types of movements in the somatic motor sytem?
reflex, rhythmic movement, voluntary movements
by tapping the ? stretches the ? and the ? in it within the ? reflex
patellar tendon, quadriceps muscle, muscle spindles, knee-jerk reflex
group of movement disorders caused by damage to parts of the brain that control movements. Characterized by weak/stiff muscles or tremors
cerebral palsy
axons of motor neurons exit the spinal cord via ? enter the ? and make connections with ?
ventral root, spinal nerve, skeletal muscles
synapse between motor neuron and muscle fiber is known as ?
neuromuscular junction
white in color, fatigue quickly, contain little mitochondria and myohemoglobin and specialize in anerobic respiration (no 02)
white/fast twitch muscle fibers
activation of ? neurons allows for quick activation of motor neurons in the ? muscles to allow the hand/foot to quickly pull away from stimuli in ? reflex
nociceptive neurons, flexor muscles, withdrawl reflex
damage to a single spinal nerves results in ?
paresis (not paralysis)
what channels open up in the somatic motor system whenever an action potential arrives at the axon terminal of a motor neuron ?
voltage-gated calcium channels