Module 2: Anatomy & Physiology of the Foot
Module 2 of 10 · Lesson 1 of 4
Module 2 · Lesson 1
Understanding Foot Structure
Learning Objectives
By the end of this lesson, the learner will be able to:
- Identify the three anatomical regions of the foot — hindfoot, midfoot, and forefoot — and the bones that compose each.
- Describe the principal muscles, joints, nerves, and arteries of the foot and their relevance to nursing assessment.
- Connect common foot conditions (plantar fasciitis, hallux valgus, diabetic neuropathy, peripheral artery disease) to the underlying anatomical structures.
The foot is a remarkable piece of engineering. Twenty-six bones, thirty-three joints, and over a hundred muscles, tendons, and ligaments work together to bear the entire weight of the body, absorb shock, and propel us forward. For nurses, knowing the structure isn't an academic exercise — it is the basis for every meaningful foot assessment, every accurate piece of patient teaching, and every appropriate referral.
26
Bones
33
Joints
100+
Muscles, tendons & ligaments
The Three Regions of the Foot
The skeletal foot divides into three regions. Most foot conditions you'll encounter live in just one of them — knowing which region the complaint maps to is the first step in clinical reasoning.
Forefoot
Toes & push-off
19 bones: 5 metatarsals + 14 phalanges (the toes). Bears the brunt of push-off during gait.
Clinical relevance
Hallux valgus (bunion) is a misalignment of the great-toe joint, often aggravated by tight footwear. Hammer toes and claw toes reflect intrinsic muscle imbalance. Forefoot pain in runners often points to metatarsal stress fractures.
Midfoot
The arch & shock absorber
5 tarsal bones: navicular, cuboid, and three cuneiforms. Together they form the longitudinal arch.
Clinical relevance
A collapsed arch (pes planus / flat foot) creates pain and instability. A high arch (pes cavus) creates rigidity and predisposes to stress fracture. Midfoot pain after activity is often biomechanical in origin.
Hindfoot
The foundation
2 bones: talus (the ankle bone) and calcaneus (the heel — the largest bone in the foot). The Achilles tendon attaches to the calcaneus.
Clinical relevance
Posterior heel pain is most often Achilles tendinopathy; plantar heel pain is most often plantar fasciitis. Heel ulcers in immobile patients reflect unrelieved pressure over the calcaneus.
Beyond the Bones
Bones provide the scaffold; muscles, joints, nerves, and vessels make the foot work. Each system has direct implications for what nurses look for at the bedside.
Intrinsic muscles live within the foot and fine-tune toe motion and arch support. Extrinsic muscles originate in the leg and drive ankle and foot motion through long tendons. The plantar fascia — a dense band of tissue from heel to toes — supports the arch.
Clinical relevance
Plantar fasciitis — inflammation of the plantar fascia — is a common cause of plantar heel pain, especially with first steps in the morning.
The foot has 33 joints. The ones nurses encounter most: the ankle joint (talus + tibia/fibula; up-and-down motion), the subtalar joint (side-to-side balance), and the metatarsophalangeal (MTP) joints at the base of each toe.
Clinical relevance
Arthritis frequently affects the MTP joints, particularly the great toe. Gout classically presents in the first MTP joint with sudden, severe pain.
Three principal nerves supply the foot: the tibial nerve (sensation to the sole), the peroneal nerve (sensation to the dorsum and most toes), and the sural nerve (sensation to the lateral foot).
Clinical relevance
Diabetic peripheral neuropathy typically causes loss of protective sensation in a stocking distribution — making 10g monofilament testing essential in diabetic foot exams.
Two pulses every nurse should be able to find: the dorsalis pedis on the dorsum of the foot (between the first and second metatarsals), and the posterior tibial behind the medial malleolus.
Clinical relevance
Peripheral artery disease (PAD) reduces perfusion, causing cold feet, pallor on elevation, dependent rubor, and impaired wound healing. Diminished or absent pulses are an early signal.
Bedside Reference: What Each Structure Tells You
Plantar heel pain
Plantar fascia (most often plantar fasciitis); rule out heel pad atrophy or calcaneal stress reaction.
Posterior heel pain
Achilles tendon (tendinopathy or insertional Achilles disease).
Great-toe joint pain
First MTP joint — consider hallux valgus, hallux rigidus, or gout.
Numb sole
Tibial nerve distribution — assess protective sensation with monofilament; common with diabetic neuropathy.
Cold, pale foot
Suspected vascular insufficiency — assess dorsalis pedis and posterior tibial pulses; consider ABI.
Heel pressure injury
Calcaneus — common in immobile patients; offload immediately and assess support surface.
Key Takeaway
You don't need to memorize every bone. You do need to know the three regions, the two arteries you'll palpate, and the major nerves that can fail silently in patients with diabetes. That's the working anatomy of foot care nursing.
Reference Resource
Foot & Ankle Anatomy — Detailed Guide
A printable PDF reference covering bones, joints, muscles, and surface anatomy in greater depth.
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
- Standring S, ed. Gray's Anatomy: The Anatomical Basis of Clinical Practice. 42nd ed. Elsevier; 2020.
- Moore KL, Dalley AF, Agur AMR. Clinically Oriented Anatomy. 8th ed. Wolters Kluwer; 2018.
- Wound, Ostomy and Continence Nurses Society. Core Curriculum: Wound Management. 3rd ed.
- International Working Group on the Diabetic Foot (IWGDF). IWGDF Guidelines on the Prevention and Management of Diabetes-Related Foot Disease. 2023.
- 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).
- Bus SA, Lavery LA, Monteiro-Soares M, et al. Guidelines on the prevention of foot ulcers in persons with diabetes (IWGDF 2023 update). Diabetes/Metabolism Research and Reviews. 2024;40(3):e3651.