References. 1  Hess CL, Howard MA, Attinger CE. 2  McCulloch J. Physical modalities in wound management: ultrasound, Vasopneumatic devices and hydrotherapy. 3  Davis SC, Ovington LG.  Dyson M. Therapeutic application of ultrasound.
The three major sensory tracts involve chains of neurons â¢ First-order neuron â¢ Delivers sensations to the CNS â¢ The cell body is in the dorsal or cranial root ganglion â¢ Second-order neuron â¢ An interneuron with the cell body in the spinal cord or brain â¢ Third-order neuron â¢ Transmits information from the thalamus to the cerebral cortex. 1  Comments.
These cells are the structural and functional units of the nervous system and are specialized to react to physical and chemical changes in their surroundings (p. 203). axons. These extensions of a neuron send information in the form of nerve impulses (p. 203). dendrites.