Exam 1: Sensory Examination Flashcards
When a primary sensory modality isn’t working, what is the deficit referred to as?
Anesthesia or analgesia
What is decreased sensation and caused by nerve compression?
hypoesthesia
What is increased sensation caused by nerve irritation?
hyperesthesia
Explain the sensory pathway.
- neuron 1 is in the dorsal root either as lateral or media division info
- Neuron 1 enters spinal cord and synapses with neuron 2, which crosses midline and ascends in the a CNS tract carrying the impulse to the nucleus ventral posterolateralis/medialis of the thalamus
- Neuron 3 is at the thalamic nuceli and the thalamcocortical raditation travels to the somesthetic cortex on the post-central gyrus
Where does information from the lower part of the ascend?
medially within the cord
Where does information from hight parts of the body travel?
more laterally within the cord
What are other names for superficial sensations?
exetroceptive
Cutaneous sensations
What are the superficial sensations?
pain, temperature and light touch
Where do the receptors for exteroceptive sensations lie?
in the skin an mucus membranes
Where are superficials sensations carried in the cord?
anteriolateral district of the cord
What are the deep sensations?
pain, touch, and proprioception
Where are deep sensations carried?
posterior district of the spinal cord
Who based his observations on herpetic lesions and traumatic involvement of the spinal cord (dermatomes)?
Head
Who performed isolated posterior root sections and noted the remaining, or unaltered, sensibility after certain roots were cut?
Sherrington and forester
Who studied a large series of cases of herniated discs with the blocking of a single nerve root and modified the dermatome charts in the extremities?
keegan
