Hyporeflexia
Hyporeflexia is a reduced intensity of the reflex response in the muscle tendons of the body. This response is typically familiar to people as the “knee-jerk” reflex, tested by doctors with a tap on the knee. Areflexia is an absolute lack of response to muscle stimuli. Sensory signals invoking some motor response are sensorimotor arcs known as reflexes. Simple reflexes may be a direct (monosynaptic) synapse between sensory fiber and the receiving motor neuron. More complex (polysynaptic) reflexes can involve a chain of several synapses. A defect anywhere along the line of synaptic handover can result in hyporeflexia or areflexia.