Pathways Flashcards
Unconscious proprioception of UE
Receptors –> cell body –> IL fasciculus cuneatus –> lateral cuneate nucleus –> ICP –> cerebellum
Conscious proprioception of UE
Receptors –> cell body –> nucleus cuneatus (medulla) –> CL medial lemniscus –> cerebral cortex
Unconscious proprioception of LE
Receptors –> cell body –> fasciculus gracilis –> dorsal nucleus of clarke (lamina VII) –> dorsal spinocerebellar –> ICP –> cerebellum
Conscious proprioception of LE
receptor –> cell body –> fasciculus gracilus –> dorsal nucleus of clarke –> dorsal spinocerebellar –> nucleus gracilis (medulla) –> medial lemniscus –> post central gyrus
Pain & temperature pathway
receptor –> cell body –> lamina II & V –> crosses to CL anterior lateral spinothalamic –> medulla pons, midbrain –> VPL of thalamus –> post central gyrus (some to hypothalamus for temp)
Slow poorly localized emotional pain
receptor –> cell body –> lamina II & IV –> lateral funiculus –> raphe nucleus in medulla (spinoreticular) –>PAG in midbrain (spinomesencephalic) –> spinolimbic in limbic structures
general crude touch
receptor –> cell body –> Lamina III & IV –> CL ventral spinothalamic tract –> thalamus –> post central gyrus
2 point discrim, vibration, position, fine discrim touch
receptor –> cell body –> F cun. –> nucleus cuneatus –> F gracile –> nucleus gracilus –> –> CL medial lemniscus –> thalamus –> post central gyrus
Motor system
precentral gyrus (motor cortex) –> through CP, BP, pyramid.
Orange - crosses –> LCST –> ventral gray horn –> 88% axons out to extremities
Blue - –> ventral corticospinal tract –> ventral medial gray horn –> 10% trunk muscles
purple - IL LCST –> ventral gray horn (2%)
Pontocerebellar system
motor cortex –> pontine nucleus –> MCP –> dentate nucleus –> SCP –> red nucleus OR –> thalamus* –> motor cortex
