Spinal-cord back horn {dorsal horn} is for sense input and has ascending sense-connector nerves.
functions
Dorsal column is for fine touch and proprioception from skin, tendon, and joint.
layers
Dorsal horn has five layers. Layer 1 receives axons from skin neurons and sends to neurons higher in spinal cord. Layers 2 and 3 modulate sense input from both skin neurons and neurons in layers 4 and 5. Layer 4 receives axons from skin neurons and sends axons to layer 5. It detects gentle and general pressures. Layer 5 receives axons from skin, viscera, and layer-4 neurons and sends to brain.
nuclei
Neuron nuclei {dorsal column nuclei} receive afferent fibers from skin and send to ventrobasal complex.
tracts
Tracts are spinothalamic tract, dorsal spinocerebellar tract, ventral spinocerebellar tract, and spinoreticular pathway.
neurons
Nociceptive-specific neurons respond to noxious stimuli. Wide dynamic range neurons respond to all mechanical stimuli, but especially to noxious mechanical or thermal stimuli.
Biological Sciences>Zoology>Organ>Nerve>Spinal Cord>Horn
4-Zoology-Organ-Nerve-Spinal Cord-Horn
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Date Modified: 2022.0224