Table of Contents
Bottom parts of the foot
The bottom part of the foot, also known as the sole or plantar surface, has several distinct regions and structures:
1. Heel (Calcaneus)
- The back part of the foot where most of the weight is initially absorbed when walking or running.
- Protected by a thick, fat pad to cushion impact.
2. Arch
- Comprised of three arches:
- Medial Longitudinal Arch: Runs along the inside of the foot.
- Lateral Longitudinal Arch: Runs along the outside of the foot.
- Transverse Arch: Crosses the midfoot horizontally.
- Provides support, balance, and shock absorption.
3. Ball of the Foot
- Located at the base of the toes, particularly under the metatarsal heads.
- Takes significant pressure during activities like running and jumping.
4. Toes (Phalanges)
- Five toes, including the big toe (hallux), which aids in balance and push-off.
- The tips of the toes (distal phalanges) interact with the ground.
5. Plantar Fascia
- A thick band of connective tissue extending from the heel to the ball of the foot.
- Supports the arch and absorbs shocks.
6. Pads
- Metatarsal Pads: Cushion the ball of the foot.
- Heel Pad: Protects the calcaneus bone and absorbs impact.
7. Skin
- Tough and thickened in weight-bearing areas for protection.
- Contains sweat glands for temperature regulation.
Literature on foot anatomy
Anatomy of the foot
The foot anatomy is complex and designed for support, balance, and mobility. It can be divided into three main regions: the forefoot, midfoot, and hindfoot, each with specific bones, muscles, ligaments, and tendons.
1. Bones
The foot contains 26 bones, categorized as follows:
Forefoot:
- 14 Phalanges (toe bones):
- 2 in the big toe (proximal and distal).
- 3 in each of the other toes (proximal, middle, distal).
- 5 Metatarsals:
- Long bones in the mid-section of the forefoot.
- Numbered 1-5, starting from the big toe.
Midfoot:
- 5 Tarsal Bones:
- Navicular.
- Cuboid.
- 3 Cuneiforms (medial, intermediate, lateral).
Hindfoot:
- 2 Tarsal Bones:
- Calcaneus (heel bone): The largest bone, which supports the heel.
- Talus: Connects the foot to the ankle.
2. Joints
- Ankle Joint (Talocrural Joint): Allows dorsiflexion and plantarflexion.
- Subtalar Joint: Between the talus and calcaneus, it enables inversion and eversion.
- Metatarsophalangeal Joints (MTP): Connect metatarsals to the toes.
- Interphalangeal Joints (IP): Found in the toes, they allow bending.
3. Muscles
Divided into intrinsic (origin and insertion within the foot) and extrinsic (originate outside the foot):
- Intrinsic Muscles: Stabilize the arches and control fine movements. Examples include:
- Lumbricals.
- Interossei.
- Flexor digitorum brevis.
- Extrinsic Muscles: Enable movements such as walking and running. Examples include:
- Tibialis anterior (dorsiflexion).
- Gastrocnemius and soleus (plantarflexion).
4. Tendons
- Achilles Tendon: Connects the calf muscles to the heel.
- Posterior Tibial Tendon: Supports the arch.
- Peroneal Tendons: Stabilize the ankle.
- Flexor and Extensor Tendons: Control toe movement.
5. Ligaments
- Provide stability to the joints.
- Important ones include:
- Plantar Fascia: Supports the arch and protects underlying structures.
- Deltoid Ligament: Stabilizes the medial side of the ankle.
- Anterior Talofibular Ligament (ATFL): Commonly injured in ankle sprains.
6. Arches
- Medial Longitudinal Arch: The highest arch, running along the inside.
- Lateral Longitudinal Arch: Lower and runs along the outside.
- Transverse Arch: Runs horizontally across the midfoot.
7. Nerves
- Provide sensation and motor control:
- Tibial Nerve: The main nerve of the sole.
- Sural Nerve: Supplies the lateral foot.
- Deep Peroneal Nerve: Supplies the dorsum of the foot.
8. Blood Vessels
- Arteries supplying the foot include:
- Dorsalis Pedis Artery: On the top of the foot.
- Posterior Tibial Artery: Supplies the sole.
Foot anatomy charts and models
Common plantar surface issues
The plantar surface, commonly known as the sole of the foot, is a complex structure, and because it bears the entire weight of the body, it is prone to several distinct health issues ranging from mechanical strain to viral infections.
The following are the most common health issues affecting the plantar surface:
1. Plantar Fasciitis
Inflammation of the thick band of tissue connecting the heel to the toes. The leading cause of heel pain, especially with the first steps of the day.
2. Plantar Warts (Verrucas)
Hard, grainy growths caused by the HPV virus that develop on pressure points; they often contain tiny black pinpoints.
3. Metatarsalgia
A painful inflammatory condition affecting the ball of the foot, often feeling like a dull ache or as if there is a stone in the shoe.
4. Morton’s Neuroma
A thickening of the nerve tissue between the metatarsal heads (usually the 3rd and 4th toes), causing sharp, burning pain or numbness.
5. Hyperkeratosis (Corns & Calluses)
Areas of thickened, hardened skin formed in response to repeated friction or pressure to protect the underlying tissue.
6. Tinea Pedis (Athlete’s Foot)
A fungal infection of the skin that causes scaling, redness, and itching; “moccasin-type” affects the entire sole.
7. Fat Pad Atrophy
The thinning of the protective layer of fat under the heel or ball of the foot, leading to increased impact pain when walking.
8. Diabetic Ulcers
Open sores caused by a combination of poor circulation and nerve damage (neuropathy), which can make minor injuries on the sole difficult to detect or heal.
FAQs
What is the bottom part of the foot called?
The bottom part of the foot is called the sole or plantar surface.
Why do you need to know the anatomy of the foot?
Understanding the anatomy of the foot enables better care, improved function, and early intervention in the event of problems, making it essential for professionals and individuals alike. For example:
– Helps in designing and fitting orthotics (custom shoe inserts) to address issues such as arch support and alignment.
– Assists in choosing proper footwear to prevent or alleviate foot problems.
READ ALSO: Collapsed Arch vs Flat Feet, Best Insoles for Metatarsalgia, Can Foot Pain Cause Knee Pain?
Author
Paula Maureen has collaborated with famous shoe brands and designed popular women’s sandals. As a proofreader, she contributes to foot wisdom.
