| A | B |
|---|
| somatosense | skin sensat'ns of touch, pain, temp and proprioception |
| proprioceptive sys | somatosense that monitors body position and mvmt, acts ot maintain body position and ensuires accuracy of intended mvmts |
| Pacinia corpuscles | largest of skin Rs found in dermis layer of both hairy and hairless skin that detects high freq vibrations |
| free-nrv ending | skin R located just below skin in both hairy and hairless skin that detect temp and pain stimuli |
| fast pain (prickling pain) | type of pain carried over myelinated Type A fibers that quickly reaches spinal cord |
| slow pain (burning and aching pain) | type of pin propagated by unmyelinated Type C fibers that slowly reaches spinal cord |
| Meissner's corpuscles | skin Rs located in elevat'ns (papillae) of dermis found only in hairy skin cells into epidermis that detect low freq vibrations |
| Merkel's disks | skin Rs located in base of epidermis near sweat ducts that are snesitive to pressure |
| Ruffini's corpuscles | skin Rs located just below the skin that detect low-freq vibrations |
| dorsal column-medial lemniscal sys | somatosensory pathways which bein in spinal cord and project info about touch and proprioception to primary somatosensory cortex |
| dorsal column nuclei (DCN) | neurons in medulla that receive neural msgs about touch and proprioception via dorsal column-medial lemniscal sys |
| medial lemniscus | ribbon-like band of fibers in dorsal column-medical lemniscal sys that convey neural mgs fr dorsal column nuc to ventral posterolateral thalamic nuclei |
| ventral posterolateral thalamic nuclei | neurons in thalamus that receive info about touch and proprioception via dorsal column-medial lemniscal sys and about temp and pain via anteroateral sys |
| primary somatosensory cortex | area in anterior part of parietal lobe that detects chars of tactile stimulation (touch, temp, pain, proprioception) |
| anterolateral sys | somatosensory pathways which bein in spinal cord and project info about temp and pain to brainstem reticular formation and primary somatosensory cortex |
| posterior nuclei | group of neurons in thalamus that receive info abuot tmep and pain via anterlateral pathway |
| secondary somatosensory cortex | area of cortex that is lateral and slightly posterior to primary somatosensory cortex and is responsible for perception of touch, temp, pain and proprioception |
| spinocerebellar sys | somatosensory pathways that bein in spinal cord and poject proprioceptive info to cerebellum |
| gate-control theory of pain | view that sensory inpu fr pain receptos iwll prod perception ofpain only if msg first passes thru a "gate"located in spinal cord and lower brainstem strucs |
| periqueductal gray (PAG) | area of midbrain that is origin of descending fiber tract that synpases with inhibitory interneurons in lower brainstem and spinal cord to block msgs about pain |
