The fixation model emphasizes _____________ as the causative factor for exaggerated reflexes.

The fixation model emphasizes _____________ as the causative factor for exaggerated reflexes.

• A. Diminished mechanoreceptive afferentation
• B. Decreased visceral afferentation
• C. IVF encroachment
• D. Loss of somatic efferentation

Answer: (A)

The fixation model attributes exaggerated reflexes to reduced input from joint mechanoreceptors. These receptors continuously provide feedback about joint position and movement, helping to modulate reflex circuits. When a joint becomes fixated, its mechanoreceptive signaling diminishes, removing part of the normal inhibitory input to the spinal reflex pathways. The result is an increased excitability of those reflexes, leading to exaggerated responses. Other options don’t fit this mechanism: visceral afferentation involves organs rather than joints; intervertebral foraminal encroachment is a structural issue that doesn’t explain reflex modulation via mechanoreceptor input; and loss of somatic efferentation would typically reduce reflex activity rather than exaggerate it.

The fixation model attributes exaggerated reflexes to reduced input from joint mechanoreceptors. These receptors continuously provide feedback about joint position and movement, helping to modulate reflex circuits. When a joint becomes fixated, its mechanoreceptive signaling diminishes, removing part of the normal inhibitory input to the spinal reflex pathways. The result is an increased excitability of those reflexes, leading to exaggerated responses. Other options don’t fit this mechanism: visceral afferentation involves organs rather than joints; intervertebral foraminal encroachment is a structural issue that doesn’t explain reflex modulation via mechanoreceptor input; and loss of somatic efferentation would typically reduce reflex activity rather than exaggerate it.