29. Proprioception

the ________ plans motor movements and the _______ takes those plans and modulates them via what type of input?

cortex

cerebellum

proprioceptive and vestibular input

what is the voluntary portion of the nervous system?

somatic NS with sensory and motor

proprioception

body's ability to sense its location in space, movement, and actions

what input is for head position and balance input? what about for body body and its position?

vestibular, somatosensory

Body position information is transmitted in two parts

1. cerebellum which receives ___________ proprioception

2. somatosensory cortex which receives ___________ proprioception

unconscious, conscious

what are the receptor types for proprioception?

mechanoreceptors, proprioreceptors

Muscle spindles are located throughout skeletal muscle. They detect phases of muscle movement through (stretch/tension)

stretch

T/F: muscle spindles require contraction of surrounding extrafusal muscle fibers

false, have own gamma motor neuron to maintain tone

Gogli tendon organs are encapsulated afferent nerve ending at the junction of a muscle and tendon that detect (stretch/tension) induced by muscle contraction

tension

Which funiculi are ascending pathways found in?

dorsal and lateral

Explain signals for conscious proprioception

left side of body -> thalamus -> somatosensory cortex in cerebrum -> right cortex

explain signals for unconscious proprioception

left side of body -> ipsilateral cerebellum

_____________ interprets subconscious proprioception (hint: make smooth and correct movement)

cerebellum

explain signals for subconscious proprioception

stretch mecahnoreceptor -> peripheral nerve -> DRG -> spinocerebellar or spinocuneocerebellar tract -> ipsilateral cerebellim

spinocuneocerebellar tract

a. function

b. funiculus

transmits unconscious proprioceptive info to cerebellum from thoracic limb

dorsal

spinocerebellar tract

a. function

b. tract

transmits unconscious proprioceptive info to cerebellum from pelvic limb

lateral

T/F: vestibular lesion is always on the same size as proprioceptive defectis

true

cerebellar lesion may lead to ____lateral proprioceptive defectis

ipsilateral

unilateral spinocerebellar tract damage results in ____lateral proprioceptive deficits

ipsilateral

conscious proprioception pathway

stretch mecahnoreceptor -> peripheral nerve -> DRG -> dorsal funiculus faciculus cuneatus or fasciculus gracilis) -> contralateral somatosensory cortex

Fasciculus gracilis

a. function

b. funiculus

transmits conscious proprioceptive info to cerebrum from trunk and pelvic limbs

dorsal

Fasciculus cuneatus

a. function

b. funiculus

transmits conscious proprioceptive info to cerebrum from thoracic limbs

dorsal

cerebral cortex lesion may lead to ______lateral proprioceptive defecits

contralateral

unilateral spinal cord damage results in _____lateral proprioceptive deficits

ipsilateral

what is the first thing we lose with spinal cord compression? 2nd? 3rd? Explain

proprioception

motor function

conscious pain sensation

proprioceptive fibers are the largest axons with heavy myelination

T/F: a deep pain positive dog has a more severe spinal cord compression than a deep pain negative dog

false

T/F: all parts of the neurological system must be intact for postural reaction

true, any damage can lead to deficits

Is there a single test for conscious proprioception?

no

If there is a lesion in left cerebrum where would you see proprioceptive deficits?

right thoracic and pelvic limbs

If there is a lesion in right brainstem where would you see proprioceptive deficits?

right thoracic and pelvic limbs

If there is a lesion in right cerebellum where would you see proprioceptive deficits?

right thoracic and pelvic limbs

If there is a lesion in right C1-5 and C6-T2 where would you see proprioceptive deficits?

right thoracic and pelvic limbs

If there is a lesion in right T3-L3 and L4-S1 where would you see proprioceptive deficits?

right pelvic limb ONLY

If there is a lesion in right S1-S3 where would you see proprioceptive deficits?

normal