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Dorsal Foot Reflex – Meaning and Neurological Exam
The dorsal foot reflex is a neurological deep tendon reflex elicited by tapping the top of the foot, providing insight into the integrity of the nervous system.
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The dorsal foot reflex is a neurological deep tendon reflex elicited by tapping the top of the foot, providing insight into the integrity of the nervous system.
What is the Dorsal Foot Reflex?
The dorsal foot reflex is a neurological deep tendon reflex (proprioceptive reflex) triggered by mechanical stimulation – typically a tap with a reflex hammer – applied to the dorsum of the foot (the top surface). The expected response is a slight dorsiflexion (upward movement) of the toes. This reflex belongs to the group of myotatic reflexes and is used in neurological examinations to assess the integrity of specific nerve and spinal cord segments.
Anatomical Basis
The dorsal foot reflex is mediated primarily through the deep peroneal nerve (deep fibular nerve). The corresponding spinal cord segments are L4 to S1. The reflex arc travels from mechanoreceptors in the dorsum of the foot through afferent nerve fibers to the spinal cord and back through efferent fibers to the foot extensor muscles.
Clinical Significance and Examination
In neurological diagnostics, the dorsal foot reflex is routinely tested to identify potential damage to the peripheral or central nervous system.
- Normal finding: A regular, symmetric reflex response on both sides indicates an intact reflex arc.
- Reduced or absent reflex (hyporeflexia/areflexia): May suggest peripheral nerve damage, radiculopathy (e.g., disc herniation at L4/L5 or L5/S1), or polyneuropathy.
- Exaggerated reflex (hyperreflexia): May indicate damage to the central nervous system (CNS), such as after a stroke or in spinal cord disorders.
Distinction from Related Reflexes
The dorsal foot reflex should be distinguished from the Babinski sign, in which stroking the lateral sole of the foot produces a pathological toe response indicating an upper motor neuron lesion. The Achilles tendon reflex (ATR), mediated at the S1/S2 level, is frequently tested alongside the dorsal foot reflex in clinical practice.
When to See a Doctor
Any change in reflex responses should be evaluated by a neurologist or general practitioner. Accompanying symptoms such as numbness, tingling, muscle weakness, or gait disturbances make a prompt medical assessment especially important. Reflex changes alone are not a definitive diagnosis and must always be interpreted within the broader clinical context.
References
- Mumenthaler M., Mattle H. - Neurology. 13th Edition. Thieme Publishing, Stuttgart 2013.
- Duus' Topical Diagnosis in Neurology. Duus P. et al. Thieme Publishing, 5th Edition, 2012.
- American Academy of Neurology (AAN) - Guidelines on Neurological Examination. www.aan.com
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