BIOL373 Lecture Notes - Brainstem, Nociceptor, Short Circuit
4 Feb 2014
School
Department
Course
Professor
Document Summary
Enters spinal cord via dorsal root and synapses in the grey matter (in the dorsal horn of the spinal cord) to the second order neurons. Crosses as it dives into the white matter. Sensory nerve may also cross in the medulla (instead of the spinal cord); info from the right side of the body will cross to the left hemisphere (and vice versa) Thalamus is a relay point for all senses except smell! Note: the location of the synapse between the primary and secondary neurons varies according to the type of receptor. The somatosensory cortex is the part of the brain the recognizes where ascending sensory tracts originate (depending on where the neurons terminate in the somatosensory cortex) Neuron with free nerve ending are most common and most mysterious. Pacinian corpuscles: respond to vibration and one of the largest receptors in the body (vibrations open mechanically gated ion channels) Composed of nerve endings encapsulated in layers of connective tissue.
