Alec Titan
The ankle joint is one of the most valuable structures in the human body due to its intricate articulating surfaces and function in ambulation. Dorsiflexion is the movement of the foot upwards towards the lower leg, and it is facilitated by the muscles in the anterior compartment of the leg. The muscles that dorsiflex the foot include the tibialis anterior, extensor digitorum longus, extensor hallucis longus, and fibularis tertius. The tibialis anterior is the strongest dorsiflexor of the foot, and its paralysis results in foot drop, or an inability to dorsiflex.
| Characteristics | Values |
|---|---|
| Muscles that dorsiflex the foot | Tibialis anterior, Extensor digitorum longus, Extensor hallucis longus, Fibularis tertius |
| Tibialis anterior origin | Lateral tibia |
| Tibialis anterior insertion | Medial border of the foot |
| Tibialis anterior function | Dorsiflexion and inversion of the foot |
| Extensor digitorum longus origin | Tibia |
| Extensor digitorum longus insertion | Toes |
| Extensor digitorum longus function | Extension of the toes and dorsiflexion of the foot |
| Extensor hallucis longus origin | Fibula |
| Extensor hallucis longus insertion | Big toe |
| Extensor hallucis longus function | Extension of the big toe and dorsiflexion of the foot |
| Fibularis tertius function | Dorsiflexion of the foot |
Explore related products
What You'll Learn
Tibialis Anterior
The tibialis anterior is the strongest and primary dorsiflexor of the foot. It is a fusiform muscle found in the anterior part of the leg. The tibialis anterior is the most superficial and anterior-facing muscle among the group of muscles that dorsiflex the foot. It is thick and fleshy above and tendinous below, with fibres that run vertically downward and end in a tendon. The tendon is usually visible on the anterior surface of the muscle at the lower third of the leg.
The tibialis anterior is inserted into the medial and inferior surface of the medial cuneiform bone, and the adjacent portion of the first metatarsal bone. The muscle arises from the upper two-thirds of the lateral surface of the tibia and the adjoining part of the interosseous membrane and deep fascia overlying it. It also arises from the intermuscular septum between this muscle and the extensor digitorum longus. The tibialis anterior is innervated by the deep fibular nerve, and recurrent genicular nerve (L4).
The tibialis anterior is one of four muscles in the anterior compartment of the leg, along with the extensor digitorum longus, extensor hallucis longus, and fibularis tertius. These muscles collectively dorsiflex and invert the foot at the ankle joint. The tibialis anterior is a powerful inverter, and its movement of inversion occurs at two synovial joints in the foot: the subtalar joint and the midtarsal joint.
The tibialis anterior is important for maintaining the medial longitudinal arch of the foot and drawing up and holding the toe in a locked position. It helps to stabilise the ankle as the foot hits the ground during the contact phase of walking and acts to pull the foot clear of the ground during the swing phase. This muscle is crucial for activities such as walking, hiking, and kicking a ball.
Otters' Muscular Bodies: Nature's Powerful Swimmers
You may want to see also
Explore related products
Extensor Digitorum Longus
The extensor digitorum longus (EDL) is a feather-like muscle in the anterior (extensor) compartment of the leg. It is the most lateral muscle in the anterior compartment, lying to the side of the tibialis anterior and extensor hallucis longus. The EDL is one of four muscles in the anterior compartment, the others being the tibialis anterior, extensor hallucis longus, and fibularis (peroneus) tertius.
The EDL originates from the inferior part of the lateral tibial condyle, the proximal half of the medial surface of the fibula, and the anterior surface of the interosseus membrane. The muscle then descends inferiorly and, just above the ankle, gives off a tendon that passes under the superior extensor retinaculum and through the inferior extinaculum. Within the inferior extensor retinaculum, the tendon splits into four smaller tendons that are wrapped together in a synovial sheath.
The EDL is classified as a unipennate muscle because all the muscle fibres attach to one side of the tendon. The muscle is innervated by the deep fibular nerve (L5, S1), a branch of the common fibular nerve. The leg portion of the muscle is supplied by two arteries of the leg: the proximal part is supplied by the anterior tibial artery, while the distal part receives blood from the fibular artery. The tendons of the muscle are vascularized by the anterior lateral malleolar, lateral tarsal, metatarsal, plantar, and digital arteries.
The EDL is one of the muscles that contribute to dorsiflexion of the foot, along with the tibialis anterior, extensor hallucis longus, and fibularis tertius. Dorsiflexion is the superior raising of the mid- and forefoot while the tibia and fibula remain static, causing an upward bend at the ankle joint. The EDL also crosses the subtalar, metatarsophalangeal, and interphalangeal joints of the foot, allowing it to evert the foot and extend the toes.
Reducing Calf Muscles: Tips for a Slimmer Lower Leg
You may want to see also
Explore related products
Extensor Hallucis Longus
The extensor hallucis longus (EHL) is a thin skeletal muscle located in the anterior compartment of the lower leg. It is situated between the tibialis anterior and the extensor digitorum longus muscles. The muscle originates from the anteromedial aspect of the fibula, extending to the anterior aspect of the interosseous membrane of the leg, which is located between the fibula and tibia.
The EHL has several functions. Its main function is to extend the big toe (hallux) at the metatarsophalangeal and interphalangeal joints. This action is crucial for walking and running. Additionally, the EHL assists with foot eversion and inversion and dorsiflexes the foot at the ankle joint. The EHL also helps to stabilise the big toe joint.
Weakness of the EHL can cause issues with the toe folding under the foot when putting on socks or shoes, leading to tripping. Hyperextension of the big toe can also cause pain and calluses, or corns, on the dorsal surface of the interphalangeal joint.
Exercises that target the EHL include the big toe lift, where the big toe is raised while keeping the other toes flat on the floor, and the big toe extension with heel raises, where heel raises are performed while keeping the big toe extended. These exercises help improve isolation, range of motion, and strength of the EHL.
Elbow Flexion Muscles: Uncover the Key Players
You may want to see also
Explore related products
Fibularis Tertius
The fibularis tertius, also known as the peroneus tertius, is a muscle in the anterior compartment of the leg. It is one of the three fibularis muscles, the others being the fibularis longus and fibularis brevis. The fibularis tertius is the most superficial muscle in the anterior compartment of the leg.
The fibularis tertius arises from the lower third of the front surface of the fibula, the lower part of the interosseous membrane, and the septum, or connective tissue, between it and the fibularis brevis. The septum is sometimes called the intermuscular septum of Otto. The muscle passes downward and ends in a tendon that passes under the superior extensor retinaculum and the inferior extensor retinaculum of the foot in the same canal as the extensor digitorum longus muscle. The tendon inserts into the medial part of the posterior surface of the shaft of the fifth metatarsal bone. The fibularis tertius is supplied by the deep fibular nerve, which is a branch of the sciatic nerve. In rare cases, it may also be supplied by the common fibular nerve.
The fibularis tertius acts to tilt the sole of the foot away from the midline of the body (eversion) and to pull the foot upward toward the body (dorsiflexion). It is considered a weak dorsiflexor and evertor of the foot due to its relative small size and poor mechanical leverage. The strength of eversion and dorsiflexion is not compromised in people who lack the fibularis tertius muscle.
The presence of the fibularis tertius varies depending on the population studied. For example, in two separate studies, the muscle was present in less than 50% of a Chilean sample population and 63% of a south-western Nigerian sample population. The fibularis tertius may be absent in as few as 5% of people, or as many as 72%, depending on the population surveyed. It is rarely found in other primates, and its function has been linked to efficient bipedalism.
Rehydrating Muscles: Tips for Quick Muscle Recovery
You may want to see also
Explore related products
Fibularis Brevis
The fibularis brevis, also known as the peroneus brevis, is a short muscle that lies in the lateral part of the lower leg deep to the fibularis longus. It is one of the three ankle everters, or fibularis muscles, the others being the fibularis longus and fibularis tertius. The fibularis brevis is supplied by the superficial fibular (peroneal) nerve.
The fibularis brevis originates from the distal two-thirds of the lateral surface of the fibula and the adjacent part of the anterior intermuscular septum. The muscle fibres course inferomedially along the lateral border of the fibula, forming a fusiform muscle belly. The muscle belly of the fibularis brevis is found posterior to the extensor digitorum longus and fibularis tertius, and anterior to the fibularis longus, flexor hallucis longus, and distal part of the soleus muscle. The tendon of the fibularis brevis initially runs anterior to the tendon of the fibularis longus, and then continues caudally to pass behind the lateral malleolus to enter the lateral part of the foot. The tendon finally inserts on the tuberosity of the fifth metatarsal bone, posterior to the insertion of the fibularis tertius muscle.
The main function of the fibularis brevis is to evert the foot at the subtalar joint, which helps to restore the foot to its anatomical position after it has been inverted. This is particularly important when running or walking on uneven terrain, as it prevents the body from falling to the opposite side when balancing on one leg. The fibularis brevis also assists in plantar flexion, extending the foot downward away from the body at the ankle. It achieves this in conjunction with the fibularis longus and the tibialis posterior.
The fibularis brevis is the strongest abductor of the foot. It is susceptible to injury, with tendon injuries commonly caused by inversion or supination forces. Fibularis brevis split tears are a common source of lateral ankle pain, and can be diagnosed with MRI imaging or ultrasound. When the base of the fifth metatarsal is fractured, the fibularis brevis may pull on and displace the upper fragment, resulting in a Jones fracture.
Exploring Sea Star Biology: Do They Flex Muscles?
You may want to see also
Frequently asked questions
Dorsiflexion is the upward movement of the foot at the ankle joint.
The muscles that dorsiflex the foot are the tibialis anterior, extensor digitorum longus, extensor hallucis longus, and fibularis tertius.
The tibialis anterior is the strongest dorsiflexor of the foot and is responsible for lifting the foot during the swing phase of gait.
An injury to the dorsiflexors can result in a condition called foot drop, where the foot is unable to dorsiflex and clear the ground during walking. Treatment options include surgical repair, nerve grafting, or the use of an ankle-foot orthosis (AFO).
