ACB 334 Lecture Notes - Lecture 8: Internal Arcuate Fibers, Proprioception, Thalamus

• School: U of S
• Department: Anatomy and Cell Biology
• Course: ACB 334
• Professor: Jen Chlan

Document Summary

Functions: to relay somatosensory information to cortex for conscious, to relay information to cerebellum to movement modulation, to relay information to higher centers for arousal and alertness. Arrangement: information is taken from primary sensory receptors (peripheral ganglion). Passed to second order neuron then to thalamus or cerebellum passed to tertiary neuron in thalamus to cortex. Groups: fiber tracts that convey info that will reach cortex. And synapses on clarks n. 2nd order ipsilaterally psc tract. Part crosses at n. z (proprioception only in n. gracilis. Spinal n. spinal trigeminal n. descending spinal trigeminal n (pain and temp. uses ventral portion. Vpm) : tracts that covey info to cerebellum. Posterior: enters dorsal horn travels up sc through n. gracilis. Trigeminocerebellar tract: contralateral: tracts that convey info to higher centers. Trigmeniothalamic : from spinal descending n of cn v. Spinoreticular & trigemino-reticular fibers: both direct connections from sc and collaterals from spinothalamics.