week 4: sensory examination & reflex integrity screen Flashcards
2 main spinal pathways (afferent):
Anterolateral Spinothalamic
Dorsal column-medial leminscus (DCML)
Nondiscrimitive/crude touch, pain, temperature
more primitive system
anterolateral
spinothalamic
Precise location, discriminative touch (localized)
Dorsal column-medial leminscus (DCML)
Is the following statement True or False?
Are both Anterolateral Spinothalamic and dorsal column-medial lemniscus (DCML) transmitting sensory information to the brain?
True
Anterolateral Spinothalamic receives signals from __________,__________,__________ and carry ________ fibers, which are unmyenlinated
mechanoreceptors, nociceptors, and thermoreceptors
C-fibers
The DCML receives signals from specialized ________ and carries ______ and _______ fibers, which are myelinated rapidly conducting.
mechanoreceptors; a-beta and a-delta
What is the location of the somatosensory cortex and motor cortex:
post-central gyrus (sensory); pre-central cortex (motor)
The relative size of body parts represents the amount of sensory input and the importance of sensory information from that body region as it relates to function.
homunculus
What are the three divisions of sensory receptors:
superficial
deep
combined (cortical) sensation
These sensory receptors receive stimuli from an external environment via skin and subcutaneous tissue:
superficial sensation
These sensory receptors receive stimuli from muscles, tendons, ligaments, joints, and fascia.
deep sensation
What are combined cortical sensations?
-examples:
combination of both exteroceptive and proprioceptive receptors
stereognosis, two-point discrimination, tactile localization, recognition of texture, etc.
Responds to mechanical deformation of the receptor or surrounding area:
mechanoreceptors
Respond to changes in temperature:
thermoreceptors
Responds to noxious stimuli and results in the perception of pain:
nociceptors
