Final Exam: Proprioception Flashcards
Asssesses body position in space
proprioception
What is the function of the golgi tendon organs
joint angle and tendon tension
Proprioception is carried by conscious/unconscious pathways that terminate in the cerebral cortex
conscious
Proprioception is carried by conscious/unconscious pathways that terminate at the cerebellum.
Unconscious
What is a CP deficit?
conscious proprioception deficit
T/F. proprioception cannot be tested in a paralyzed patient
f.
How is proprioception sent to the brain?
via afferent neurons in the dorsal column of the medial limniscus (DCML)
T/F. Axons of DCML are small and lightly myelinated.
F. Large and Heavily myelinated
How is sensation lost for an animal?
PMS
- proprioception
- motor
- Sensory
What are the 3 reasons for neurologic gait?
- Proprioceptive
- Vestibular
- Cerebellar
Where does conscious proprioception terminate?
Parietal lobe of the cerebrum in the somatosensory cortex
abnormal gait due to neurologic dysfunction
Ataxia
What are the two primary pathways for proprioception
- dorsal column
2. trigeminal pathway
What pathway of proprioception covers from the neck down?
dorsal column
What pathway of proprioception covers the face
trigeminal
Main purpose of this system is to present afferent information to cortex about body position
conscious proprioception
DCML pathway receptors:
Proprioceptors
What are the 3 afferent proprioceptors?
- skin mechanoreceptors
- Muscle spindles detect change in m. lenght
- Golgi tendon organs detect tension in tendons and joint capsules
grand relayer of all things sensory
Thalamus
Pelvic limb pathway travels though the fasciculus _____
gracilis
Thoracic limb pathway traves through the fasciculus ______
cuneatus
What is more lateral, the fasciculus gracilis or cuneatus?
cuneatus
Proprioceptive fibers ascent the spinal cord ______ then secussates at the brain stem
Ipsilaterally
What is the recipe for proprioception:
- receptor
- spinal cord segment
- fasciculus gracilis or fasciculus cuneatus
- decussation in the brain stem (medulla)
- carried to cerebral cortex (parietal lobe)
You have an animal presenting with dec. CP of the right pelvic limb. provide a possible location of the lesion:
a. mechanoreceptive primary n. ending
b. lumbar intumescence
c. right fasciculus gracilis
d. parietal lobe
e. all of the above
e. all of the above
Pathway of proprioception that is conscious proprioception from the face to cortex
Trigeminal pathway
All proprioceptive info from one side of the body reache the same/opposite somatosensory cortex
Opposite
Neurologic gate abnormality:
ataxia
What type of gait do dogs have during atxia
wide swing phase of gait
longer stride with crouch appearance
What test do you do to test proprioceptive deficits
Postural reaction tests
aka conscious proprioceptive tests (CP test)
What are the 5 CP tests
- proprioceptive positioning
- Wheelbarrowing
- hopping
- hemistanding/walking
- placing
What are the clinical signs of proprioceptive ataxia
abnormal postural reactions
failure to pass CP test
Lesions to what 3 areas could cause vestibular ataxia?
- Vestibular nuclei
- CN VII
- Vestibular receptors
What are the c/s of vestibular ataxia
- abnormal nystagmus
- head tilt
- head turn
- leaning
- falling
Lesions to what would cause cerebellar ataxia
Cerebellum
What are some C/S of cerebellar ataxia?
abnormal rate, range, and force of movement
T/F in cerebellar ataxia there is no CP deficit.
T
T/F in vestibular ataxia there is no CP deficit
T
T/F vestibular ataxia causes paresis
F
A lesion in the right parietal lobe would lead to CP deficits in the:
a. left thoracic limb
b. left pelvic limb
c. right thoracic limb
d. right pelvic limb
e. Both A and B
f. Both C and D
e.
Does an animal with a cerebellar lesion have CP deficits?
a. yes
b. no
b. no
Proprioception is often the first/last sense affected during compressive spinal injury
First
What is the cascade of sensory loss in compressive spinal injury
- Proprioception
- motor
- superficial pain
- deep pain
