Anatomy and Cell Biology 3319 Lecture Notes - Lecture 11: Internal Arcuate Fibers, Cuneate Nucleus, Medial Lemniscus

• School: Western University
• Department: Anatomy and Cell Biology
• Course: Anatomy and Cell Biology 3319
• Professor: Steve Laviolette

Document Summary

Main system which takes most of the cognitive tactile information we have of the world and sends it to post central gyrus (somatosensory cortex) Dorsal root ganglia (cell bodies of sensory neurons) Sensory info goes to dorsal horn of spinal cord. From stretch reflex we know some of that goes down same segment to motor neuron. We want to know about info that turns and goes up spinal cord (conscious tactile info) We have 2 levels here (lumbar and cervical) If we start with lu(cid:373)bar i(cid:374)fo that"s tur(cid:374)i(cid:374)g a(cid:374)d goi(cid:374)g up we see its in this medial aspect of the dorsal funiculus (all white matter in dorsal part of spinal cord) Info from lower body turns and ascends through medial and goes to gracile fasciculus. Somatosensory info from upper body turns and ascends through cuneate fasciculus. Each of things in gracile and cuneate fasciculus organized in topographic. Is no synapse for info ascending spinal cord -