| A | B |
|---|
| collection of nerve roots at the inferior end of the vertebral column | cauda equina |
| sensory neurons enter the spinal cord here | posterior (dorsal) horns |
| somatic motor neurons to skeletal muscles | anterior (ventral) horns |
| ascending tract: limb & trunk position and movement, deep touch, visceral pain | gracile fasiculus & cuneate fasiculus |
| ascending tract: light touch sensation, tickles, itches, temperature, pain, and pressure | spinothalamic |
| ascending tract: pain sensation from tissue injury | spinoreticular |
| ascending tract: proprioception | anterior & posterior spinocerebellar |
| descending tract: fine control of the limbs | lateral & anterior corticospinal |
| descending tract: reflexive head turning in response to auditory and visual stimuli | tectospinal |
| descending tract: balance and posture; regulation of awareness of pain | lateral & medial reticulospinal |
| descending tract: balance & posture | lateral vestibulospinal |
| descending tract: control of head position | medial vestibulospinal |
| sensory neuron into the spinal cord synapses directly with a motor neuron | monosynaptic reflex arc |
| at least one association neuron is located between the sensory and motor neurons | polysynaptic reflex arc |
| sensory input is from one side of the body and the motor output is on the opposite side of the body | contralateral reflex arc |
| sensory input occurs at one level and the motor output occurs at another level | intersegmental reflex arc |
| contraction of the muscle when the tendon is tapped or stretched quicly or excessively | tendon reflex |
| uses parallel after discharge circuits to sustain the action and is polysynaptic | flexor (withdrawl) reflex |
| helps to maintain posture and equilibrium | stretch reflex |
