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The muscles of the dorsum of the foot are a group of two muscles, the extensor digitorum brevis and extensor hallucis brevis, which together represent the dorsal foot musculature. The muscles of the foot can be divided into two groups: extrinsic and intrinsic muscles. The extrinsic muscles are located in the anterior and lateral compartments of the leg, while the intrinsic muscles are located within the foot and are responsible for fine motor actions. The muscles of the dorsum of the foot extend the toes at their metatarsophalangeal and interphalangeal joints. The latissimus dorsi, or lats, are another set of dorsum muscles, but these are located in the back.
| Characteristics | Values |
|---|---|
| Number of muscles | 2 |
| Muscle names | Extensor digitorum brevis, Extensor hallucis brevis |
| Muscle function | Extend the toes at their metatarsophalangeal and interphalangeal joints |
| Innervation | Deep fibular or peroneal nerve |
| Location | Dorsal aspect of the foot |
| Muscle belly | Forms the surface of the lateral dorsum of the foot |
| Subcutis | Flexible, elastic, prone to accumulating fluids and swelling (edema) |
| Edema occurrence | Common in numerous clinical conditions, e.g., right heart failure, venous and lymphatic obstructions, inflammation, allergic reactions |
| Muscle group | Intrinsic muscles |
| Muscle function in forearm | Extension of the thumb |
| Muscle name in back | Latissimus dorsi |
| Latissimus dorsi function | Extension, adduction, transverse extension, flexion from an extended position, and medial internal rotation of the shoulder joint |
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What You'll Learn
Extensor digitorum brevis and extensor hallucis brevis muscles
The muscles of the dorsum of the foot are a group of two muscles, the extensor digitorum brevis and the extensor hallucis brevis. These muscles represent the dorsal foot musculature and are found within a flat fascia on the dorsum of the foot, known as the fascia dorsalis pedis.
The extensor digitorum brevis is a thin muscle found on the dorsum of the foot. This muscle assists in extending the second, third, and fourth toes at the distal interphalangeal joints. It also helps to extend the same interphalangeal joints in cooperation with the lumbrical muscles of the foot. The most medial tendon of the extensor digitorum brevis, also known as the extensor hallucis brevis, extends the great toe at the metatarsophalangeal joint. The contraction of this muscle results in dorsiflexion or hyperextension of the second to fourth toes, occurring at the metatarsophalangeal joints of the same digits.
The extensor hallucis brevis is the most medial part of the extensor digitorum brevis muscle and ends in a tendon. This tendon crosses the dorsalis pedis artery and inserts into the dorsal surface of the base of the proximal phalanx of the great toe. The extensor hallucis brevis muscle causes dorsiflexion of the metatarsophalangeal joint of the big toe.
The muscle bellies of the extensor digitorum brevis and extensor hallucis brevis form the surface of the lateral dorsum of the foot. These muscles are innervated by the deep fibular or peroneal nerve (L5-S1). The deep fibular nerve is also known as the deep peroneal nerve.
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Dorsal foot muscles and toes
The muscles of the foot can be divided into two groups: the muscles of the dorsum of the foot and the muscles of the plantar part of the foot (or sole of the foot). The muscles of the dorsum of the foot are responsible for extending the toes at their metatarsophalangeal and interphalangeal joints.
There are two muscles that make up the musculature of the dorsum of the foot: the extensor digitorum brevis and the extensor hallucis brevis. The extensor digitorum brevis is a small, thin muscle that lies underneath the long extensor tendons of the foot. It originates from the calcaneus and inferior extensor retinaculum and attaches to the long extensor tendons of the second to fourth toes. The contraction of this muscle results in the dorsiflexion or hyperextension of the second to fourth toes. The extensor hallucis brevis is often considered to be part of the extensor digitorum brevis muscle, rather than a separate structure. It originates from the calcaneus and inferior extensor retinaculum and attaches to the base of the proximal phalanx of the big toe. This muscle causes the dorsiflexion of the metatarsophalangeal joint of the big toe.
The muscles of the plantar aspect of the foot, on the other hand, are responsible for stabilising the arches of the foot and controlling the movement of the digits. There are ten intrinsic muscles located in the plantar aspect of the foot. The abductor hallucis muscle, for example, is located on the medial side of the sole and contributes to a small soft tissue bulge. It originates from the medial tubercle of the calcaneus, the flexor retinaculum, and the plantar aponeurosis. It attaches to the medial base of the proximal phalanx of the big toe and is responsible for the abduction and flexion of the big toe.
The foot muscles can also be divided into four layers, with the first layer being the most superficial and closest to the bottom of the foot. The first layer contains the abductor hallucis, flexor digitorum brevis, abductor digiti minimi, quadratus plantae, and lumbricals. The second layer hosts the lumbricals and the flexor hallucis brevis, aiding in flexing the toes, maintaining balance, and assisting in walking and running. The third layer comprises the flexor digiti minimi brevis, the adductor hallucis, and the flexor hallucis brevis, which is associated with movements of the great toe. The fourth and final layer contains the interossei muscles, both the dorsal and plantar.
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Latissimus dorsi muscle and back pain
The latissimus dorsi is a large, flat muscle on the back, stretching to the sides and behind the arm. It is one of the largest muscles in the back and is commonly referred to as the "
Due to its extensive connections to various body parts, an injury to the latissimus dorsi can result in pain in multiple areas. Individuals may experience pain in the shoulder blade, upper and lower back, arms, or even fingers. The pain typically worsens when reaching forward, extending the arms, or reaching overhead. Latissimus dorsi injuries are rare but tend to occur in athletes who perform specific movements, such as water skiers, golfers, baseball pitchers, and gymnasts.
To prevent and manage latissimus dorsi pain, several measures can be taken. Maintaining good posture and avoiding slouching are important preventive steps. Proper hydration, particularly before and after exercising, is also beneficial. Regular stretching and warming up before physical activities can help, and applying a heating pad before a workout is recommended. Additionally, occasional massages can help loosen any tightness in the back and shoulders. If pain persists or is severe, it is advisable to consult a doctor for further guidance and treatment options.
There are specific exercises that can help manage and prevent latissimus dorsi pain. These include physical therapy, muscle-strengthening exercises, and stretching routines. One example is the seated side stretch: sit with your legs apart, back and head straight, toes pointed up, and elbows bent with arms out to the sides. Tighten your core muscles, gently exhale, and slowly lean to one side without bending forward or twisting. Hold the stretch for 15-30 seconds, then repeat on the other side. Additionally, ensuring proper sleep posture can help; sleeping flat on your back with a pillow under your head or neck and another under your knees can help keep your spine aligned and reduce pressure on your back.
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Latissimus dorsi muscle injuries
The latissimus dorsi is a large muscle in the back that helps control the movement of the shoulders. It is sometimes referred to as the "lats" and is known for its large, flat "V" shape. It spans the width of the back and is one of the largest muscles in the body.
Latissimus dorsi injuries are usually caused by overuse, poor technique, or failure to warm up before exercising. Poor posture and slouching can also cause pain in this muscle. In rare cases, the latissimus dorsi can tear, which is more likely to occur in professional athletes such as water skiers, golfers, baseball pitchers, rock climbers, track athletes, volleyball players, and gymnasts. However, a serious injury can also cause a tear.
The symptoms of a latissimus dorsi injury include pain in the shoulder blade, upper and lower back, arms, or fingers. The pain will worsen when reaching forward, extending the arms, or reaching overhead. It is hard to differentiate latissimus dorsi pain from other types of back or shoulder pain. However, if you are experiencing trouble breathing, a fever, or abdominal pain, combined with latissimus dorsi pain, these may be symptoms of a more serious injury or condition.
To treat a latissimus dorsi injury, it is recommended to rest and avoid activities that may cause discomfort, pain, and swelling. Applying ice to the injured area can also help. Physical therapy can be used to restore muscle function and reduce pain. Certain stretches may also ease the pain and strengthen the muscle to prevent further injury. However, it is important to consult a healthcare expert before performing any exercises to ensure they are safe and suitable.
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Foot muscles and cramps
The muscles of the foot can be divided into two groups: extrinsic and intrinsic muscles. The intrinsic muscles are located within the foot and are responsible for the fine motor actions of the foot, such as the movement of individual digits. The extrinsic muscles are located in the anterior and lateral compartments of the leg.
The intrinsic muscles of the foot can be further divided into two groups: the muscles of the dorsum of the foot and those in the sole of the foot. The muscles of the dorsum of the foot include the extensor digitorum brevis and extensor hallucis brevis. These muscles assist the extrinsic muscles in extending the toes and are innervated by the deep fibular nerve.
Foot cramps are sudden, painful, involuntary contractions of the muscles in the foot. They often occur in the arches of the feet, on top of the feet, or around the toes. Foot cramps are usually harmless and temporary and can be treated and prevented.
There are several possible causes of foot cramps. One common cause is dehydration, which can lead to muscle cramping throughout the body, including the feet. Dehydration occurs when the body does not get enough water, causing the muscles to malfunction and resulting in pain and spasms associated with cramping. Drinking water or electrolyte drinks can help treat dehydration and prevent foot cramps.
Another possible cause of foot cramps is low potassium levels, known as hypokalemia. Potassium is an electrolyte that helps control functions vital to muscle movement and maintenance. When potassium levels dip too low, it can cause cramping in the feet and legs. Increasing dietary intake of potassium-rich foods, such as potatoes and bananas, or taking potassium supplements can help address low potassium levels and prevent foot cramps.
Tight or poorly made shoes can also cause foot cramps by restricting movement and cutting off circulation to the foot. Switching to well-fitted shoes that provide proper support can help relieve and prevent foot cramps.
Additionally, certain medications can cause muscle cramping as a side effect. These include statin drugs for high cholesterol and diuretics. If you suspect that a medication is causing your foot cramps, consult your doctor. They will be able to recommend an appropriate course of treatment.
To relieve foot cramps, you can try light stretching and gentle massages. Applying heat or ice to the affected area can also help alleviate the pain.
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Frequently asked questions
The muscles of the dorsum are the extensor digitorum brevis and extensor hallucis brevis.
The muscles of the dorsum extend the toes at their metatarsophalangeal and interphalangeal joints.
The deep fibular or peroneal nerve innervates the muscles of the dorsum.
The latissimus dorsi muscle is responsible for extension, adduction, transverse extension, flexion from an extended position, and medial internal rotation of the shoulder joint.
Edema of the dorsum of the foot is a common symptom of several clinical conditions, including right heart failure, venous and lymphatic obstructions, inflammation, and allergic reactions.
