Foot Care Nurse Course
Module 2: Anatomy & Physiology of the Foot

Lesson 3: Circulatory & Neurological Aspects of the Feet

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Module 2 · Lesson 3 — Circulatory & Neurological Aspects
Module 2 of 10 · Lesson 3 of 4
Module 2 · Lesson 3

Circulatory & Neurological Aspects of the Foot

Estimated time: 25 min Anatomy
Learning Objectives

By the end of this lesson, the learner will be able to:

  1. Describe how arterial and venous circulation supports foot health and the consequences of its failure.
  2. Identify the principal nerves of the foot and recognize the clinical signs of peripheral neuropathy.
  3. Perform key bedside assessments — pulse palpation, capillary refill, monofilament testing, and vibration testing — and interpret findings.
  4. Apply evidence-based nursing interventions for patients with peripheral artery disease, venous insufficiency, and peripheral neuropathy.

The feet sit at the end of the longest blood vessels and the longest nerves in the body. That distance makes them especially vulnerable when circulation fails or nerves stop signaling — and it makes vascular and neurologic assessment central to every nursing foot exam. This lesson covers the two systems together because in real patients they almost always travel together: a diabetic foot is rarely just neuropathic or just ischemic. It's usually both.

Part 1
Circulation: How Blood Reaches the Feet

The feet sit at the farthest end of the arterial tree, which makes them the first place to show signs of circulatory failure. Adequate perfusion supplies oxygen and nutrients, supports wound healing, and defends against infection. When perfusion drops, every other foot care intervention becomes harder.

The Two Pulses Every Nurse Should Find

Foot pulse landmarks Top-down outline of a right foot showing the location of the dorsalis pedis pulse on the dorsum between the first and second metatarsals, and the posterior tibial pulse behind the medial malleolus. Dorsalis pedis on dorsum, between 1st & 2nd metatarsals Posterior tibial behind medial malleolus
Pulse 1
Dorsalis Pedis
Palpate on the dorsum (top) of the foot, in the groove between the first and second metatarsals, lateral to the extensor hallucis longus tendon.
Roughly 8% of healthy adults have a congenitally absent dorsalis pedis. Always palpate the posterior tibial too.
Pulse 2
Posterior Tibial
Palpate behind and slightly below the medial malleolus, between the malleolus and the Achilles tendon.
If either pulse is diminished or absent, document the finding and consider an Ankle-Brachial Index (ABI).

Common Vascular Conditions

Peripheral Artery Disease (PAD)
MechanismAtherosclerotic narrowing of the lower-extremity arteries reduces blood flow to the foot. Risk factors include diabetes, smoking, hypertension, hyperlipidemia, and advancing age.
Symptoms
  • Cold feet
  • Diminished or absent pulses
  • Pallor on elevation
  • Dependent rubor
  • Slow-healing wounds
  • Intermittent claudication
  • Rest pain (advanced)
Severe stageCritical limb ischemia presents with rest pain, non-healing wounds, or tissue loss (gangrene) and requires urgent vascular evaluation.
Nursing Interventions
  • Palpate dorsalis pedis and posterior tibial pulses; document findings
  • Inspect for ischemic changes — pallor, cyanosis, dependent rubor, ulceration
  • Encourage supervised walking programs (improves collateral circulation)
  • Counsel on smoking cessation and risk-factor management
  • Ensure properly fitting, protective footwear; avoid pressure injuries
  • Refer for ABI testing and vascular consult when indicated
Chronic Venous Insufficiency
MechanismIncompetent venous valves and venous hypertension cause blood to pool in the lower legs, leading to edema, skin changes, and ulceration.
Symptoms
  • Lower-extremity edema
  • Hemosiderin staining (brown discoloration)
  • Stasis dermatitis
  • Venous ulcers (typically gaiter area)
  • Aching, heaviness
Critical cautionCompression therapy is contraindicated in patients with significant arterial disease. Always assess for PAD (pulses, ABI) before applying compression.
Nursing Interventions
  • Elevate legs above heart level when seated or supine
  • Apply compression therapy as ordered, only after PAD has been ruled out
  • Skin care: moisturization, careful hygiene, monitor for ulceration
  • Encourage ambulation and calf-pump exercises
  • Counsel on weight management and avoiding prolonged standing
Clinical Caution: Mixed Disease

Compression stockings can cause harm in a patient with unrecognized PAD. Before applying any compression, assess pedal pulses and obtain an ABI when there is any clinical question about arterial flow.

Part 2
Nerves: How the Foot Senses and Moves

Nerves carry sensation up from the foot and motor commands down to it. When peripheral nerves fail — most commonly from longstanding diabetes — patients lose the protective sensation that warns them of injury. Nurses are often the first to detect this loss, before the patient ever reports a symptom.

The Three Nerves of the Foot

  • Tibial nerve — supplies sensation to the sole (plantar surface).
  • Peroneal (fibular) nerve — supplies sensation to the dorsum and most toes; controls foot dorsiflexion and toe extension. Damage produces foot drop.
  • Sural nerve — supplies sensation to the lateral (outer) foot.
Diabetic Peripheral Neuropathy
MechanismChronic hyperglycemia damages peripheral nerves, classically producing a stocking-distribution sensory loss. Most common cause of lower-extremity neuropathy worldwide.
Symptoms
  • Tingling, burning
  • Numbness
  • Loss of protective sensation
  • Painless injuries
  • Foot deformity (advanced)
Why it mattersPatients cannot feel pressure injuries, blisters, foreign bodies, or even fractures. The classic teaching example: a patient steps on a tack and walks all day before noticing.
Nursing Interventions
  • Perform 10g monofilament testing at standard plantar sites at every routine diabetic foot exam
  • Assess vibration sense with a 128 Hz tuning fork
  • Educate the patient and family on daily foot inspection — including with a mirror or caregiver assistance
  • Counsel: never go barefoot, even at home; check inside shoes before putting them on
  • Coordinate glycemic management with the primary care team

Interactive: The Monofilament Test

The 10-gram (Semmes-Weinstein 5.07) monofilament is the most widely used bedside test for protective sensation. Apply the filament perpendicular to the skin until it bends, hold for one to two seconds, and ask the patient to indicate whether they feel it — without looking.

Monofilament test points Plantar view of the foot with five interactive test points: the plantar surface of the great toe, the first, third, and fifth metatarsal heads, and the heel. Tap any point to mark it as tested. 1 2 3 4 5
Five-Point Plantar Screen

Test the great toe, the first/third/fifth metatarsal heads, and the heel — five sites per foot. Skip any callused areas (a callus dampens the stimulus). Loss of sensation at one or more sites indicates loss of protective sensation and elevates ulcer risk.

Tap each point to mark it tested.

0 of 5 sites tested

Putting It Together: Bedside Assessment

A complete neurovascular foot exam takes only a few minutes once the workflow is practiced.

🩸 Vascular Assessment
Check perfusion
1
Inspect

Skin color (pallor on elevation, dependent rubor), temperature, hair distribution, and any wounds.

2
Palpate pulses

Dorsalis pedis and posterior tibial bilaterally; document presence and strength.

3
Capillary refill

Press the great toenail bed; color should return within 3 seconds.

4
Ankle-Brachial Index

If pulses are diminished or symptoms suggest PAD, request ABI.

⚡ Neurological Assessment
Check sensation & motor
1
Monofilament test

10g filament at the five plantar sites per foot; loss of sensation at any site is significant.

2
Vibration sense

128 Hz tuning fork on the dorsum of the great toe; reduced perception is an early neuropathy sign.

3
Reflex testing

Achilles reflex; reduced or absent reflexes in a stocking distribution support a peripheral neuropathy.

4
Motor & gait

Observe for foot drop, intrinsic muscle wasting, or deformity suggesting motor involvement.

Key Takeaway

Vascular and neurological problems usually travel together — especially in patients with diabetes. Always assess both, and document both, on every foot exam.

Prevention & Nursing Best Practices

What every foot care nurse should do

  • Encourage walking and movement to support circulation, where the patient's overall condition allows.
  • Assess pulses and protective sensation at every routine visit for patients with diabetes or known vascular disease.
  • Counsel on daily foot inspection for high-risk patients — patients with diabetes, older adults, those with mobility limitations.
  • Recommend properly fitting, protective footwear; never barefoot, even at home, for patients with neuropathy.
  • Moisturize the dorsum and heels; avoid moisture between the toes.
  • Refer promptly: any non-healing wound, signs of ischemia, or new neuropathic symptoms warrants escalation to wound care, podiatry, or vascular.

Ready to check your understanding? Take the quick knowledge check for this lesson.

Educational Disclaimer

The information on this website and any communication with RNscrub Foot Care is provided for educational and informational purposes only. It is not a substitute for medical advice, diagnosis, or treatment. Patients are always encouraged to consult with their primary care provider or appropriate specialist for individual clinical decisions.

References

  1. American Diabetes Association Professional Practice Committee. Standards of Care in Diabetes — 2024 (Section 12: Retinopathy, Neuropathy, and Foot Care). Diabetes Care. 2024;47(Suppl 1).
  2. International Working Group on the Diabetic Foot (IWGDF). IWGDF Guidelines on the Prevention and Management of Diabetes-Related Foot Disease. 2023.
  3. Pop-Busui R, Boulton AJM, Feldman EL, et al. Diabetic Neuropathy: A Position Statement by the American Diabetes Association. Diabetes Care. 2017;40(1):136–154.
  4. Gerhard-Herman MD, Gornik HL, Barrett C, et al. 2016 AHA/ACC Guideline on the Management of Patients With Lower Extremity Peripheral Artery Disease. Circulation. 2017;135(12):e726–e779.
  5. Wound, Ostomy and Continence Nurses Society. Core Curriculum: Wound Management. 3rd ed.
  6. Boulton AJM, Armstrong DG, Albert SF, et al. Comprehensive Foot Examination and Risk Assessment. Diabetes Care. 2008;31(8):1679–1685.
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