Where is my lesion?
Loss of pain and temp R and L, all other signs are intact
anterior white commissure
C fiber
pain, temp,
neospinathalmic tract
fast pain
Alpha Motor Neurons
Locaitions: ventral horn of corresponding spinal segment
Function: innervation to extrafusal muscle: skeletal muscle fibers to contact muscle contraction
sensitive to distant environment
Loss of pain and temp bilaterally
UMN signs, loss of voluntary movement bilaterally
Anterior cord syndrome
2 Fibers
fibers are for dynamic velocity of length change (kinesthesia) as detected by the nuclear bag
spinocerebellar tract
subconscious propception of information to the cerebellum , all tracts will end up ipsilateral cerebellum
Gamma Motor Neuron
Location: ventral horn of corresponding spinal segemnt
Function: innervation to infrafusal muscle: within the muscle spindle (ends). this keeps the muscle spindle taught and able to respond to change in muscle
Gamma MN maintains the muscle spindles ability to receive proprioceptive input
Opiate Theory of Analgesia
optiate receptors in several areas of nervous system
pain comes in and sends a collateral neuron to the periadquaeducal grey (in the midbrain), periaquaductal grey send a descending signal back to the dorsal horn where we activate an opiate receptors. The opiate receptor inhibits pain from the first order neuron to the second. This causes pain to be gone.
Bilateral UMN
Bilateral loss of pain and temp
bilateral loss somatosensory, propoception, 2 pt discrimination, vibration
completed SCI
A beta
mechanroceptors of skin
Ventral spinocerebellar
LE complex input
Golgi tendon Organ (GTO)
in series with the muscle
Monitors tension
when holding something heavy GTO tells you how much you need to contract to keep the object there it is
Conscious relay (serial)
information about location and type of stimulus discriminative touch, conscious proprioception (DCML) and discriminative pain and temperature (AL)
loss of scrimcinative touch, pressures, etc on the right
loss of pain and temperature on the left
UMN signs on the right
Right Brown squared syndrome
A alpha
proprioceptors of skeletal muscle
Dorsal spinocerebellar
LE subconscious propceticption
Muscle spindle
arranged in parallel with the muscle
repsonds to:
changes in length (chain fibers) -- type 2 sensory fibers
velocity of the change (bag fibers)- type 1 a sensory fibers
Vibration
Divergent Pathways
Parallel
transmits information to many locations in the brainstem and cerebrum/slow aching pain (large, wide spread response to a stimulus)
Ataxia, intention tremor, Dysmetria, lack of coordination
spinocerebellar tract damage
1a
signaling static position detected by nuclear chain
cunceocerebellar tract
subconscious proceptiception of LE
Renshaw Inhibition
used for protection, coordiaintion, and grading movement - control
basically as alpha motor is activated, collateral are sent to that level to calm it down, this controls and helps to grade strength of contraction
Gate Theory of pain
DCML info will make it the brain dater than pain and temp and will activate the inhibitory neuron to close the gate, preventing pain from getting to the brain ,
Grab or shake the hand first. when getting burnt