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The plantaris muscle is a small muscle with a short belly and a long, thin tendon. It is located in the superficial posterior compartment of the leg, extending behind the knee and into the calf. The muscle is considered vestigial and is absent in around 7-20% of the population. The plantaris muscle is associated with calf pain and injuries, particularly in athletes, and its rupture is commonly known as tennis leg. Treatment for plantaris muscle injuries is typically non-surgical and involves rest, ice, compression, and elevation.
| Characteristics | Values |
|---|---|
| Location | Superficial posterior compartment of the leg |
| Muscle type | Small, long, thin, variably developed |
| Muscle belly | Short, fusiform (7-10 cm) |
| Tendon | Longest in the human body, thin, (30-45 cm) |
| Muscle function | Weakly assists gastrocnemius and soleus muscles in plantar flexion of the foot and knee flexion |
| Innervation | Tibial nerve (S1, S2), a branch of the sciatic nerve in the sacral plexus |
| Blood supply | Popliteal artery |
| Prevalence | Absent in 7-20% of the population, duplicated in a smaller number |
| Injury | Common injury is "tennis leg", other injuries include calf pain, ruptures, and strains |
| Treatment | Non-surgical, R.I.C.E. (rest, ice, compression, elevation), NSAIDs |
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What You'll Learn
The plantaris muscle is located in the posterior compartment of the leg
The plantaris muscle originates from the inferior end of the lateral supracondylar line of the femur, just above the lateral head of the gastrocnemius muscle. The tendon then travels along the medial border of the gastrocnemius, inserting onto the posterior surface of the calcaneus, or heel bone. The plantaris tendon is located between the soleus and gastrocnemius muscles, forming the superficial group of the posterior compartment of the leg along with these muscles.
The plantaris muscle is innervated by the tibial nerve, a branch of the sciatic nerve. It receives dual blood supply from the lateral sural artery, a branch of the popliteal artery, and the popliteal artery itself. The motor function of the plantaris muscle is minimal, and it is mainly involved in weak plantar flexion of the foot and weak flexion of the knee. It is considered a vestigial muscle, and its presence and function are still a matter of debate in the field of anatomy.
Injuries to the plantaris muscle, such as ruptures and strains, are typically less severe and can be treated non-surgically. Symptoms of a rupture include an audible popping sound during physical activity, swelling, pain in the back of the lower leg, and persistent soreness. Treatment for a plantaris muscle injury usually involves rest, ice, compression, and elevation, along with short-term use of non-steroidal anti-inflammatory drugs (NSAIDs). Full recovery from a plantaris muscle injury can take up to eight weeks.
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It is one of the calf muscles
The plantaris muscle is one of the calf muscles in the superficial posterior compartment of the leg. It is a long, thin muscle with a short belly and a long, slender tendon. The muscle belly is variable in thickness and length, and in some cases, the muscle has two bellies separated by a tendon. The plantaris tendon is the longest tendon in the human body, measuring between 30 and 45 centimetres in length. Excluding the tendon, the plantaris muscle is approximately 5 to 10 centimetres long.
The plantaris muscle is located between the two heads of the gastrocnemius muscle, with its tendon running between the gastrocnemius and the soleus muscle. The muscle arises from the inferior end of the lateral supracondylar line of the femur, just above the lateral head of the gastrocnemius muscle. The tendon then travels along the medial border of the gastrocnemius and inserts onto the posterior surface of the calcaneus, or heel bone, where it joins the common tendon of the soleus and gastrocnemius muscles, known as the Achilles tendon.
The plantaris muscle is innervated by the tibial nerve, a branch of the sciatic nerve in the sacral plexus. Its motor function is minimal, providing weak plantar flexion of the foot and weak flexion of the knee. It has been suggested that the plantaris acts as a proprioceptive organ for the larger flexors of the ankle joint, providing feedback to the central nervous system regarding the position of the foot. However, there is some disagreement about its function, and some studies argue that it may be a vestigial muscle in humans.
The plantaris muscle is susceptible to injuries, particularly ruptures, which can occur during activities such as running or jumping. Symptoms of a plantaris muscle rupture include an audible popping sound during physical activity, swelling, pain in the back of the lower leg, and persistent soreness. Treatment for plantaris muscle injuries is typically non-surgical, and recovery is generally straightforward.
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The muscle is innervated by the tibial nerve
The plantaris muscle is a small muscle with a short belly and a long, slender tendon. It is located at the posterior of the leg, extending behind the knee and into the sural region (calf) of the posterior leg. The muscle is considered to have become unimportant when human ancestors switched from climbing trees to bipedalism. In modern humans, it primarily acts with the gastrocnemius muscle.
The plantaris muscle is innervated by the tibial nerve, a branch of the sciatic nerve in the sacral plexus. The tibial nerve arises from the S1 and S2 spinal nerves. Signalling for contraction begins in the frontal lobe of the brain with the pre-central gyrus (primary motor cortex). When the tibial nerve receives an action potential, the plantaris muscle contracts, providing weak plantar flexion of the foot and weak flexion of the knee.
The tibial nerve is one of two branches of the sciatic nerve, the other being the common fibular nerve. The tibial nerve runs medially at the knee joint. Upper motor neurons are stimulated and send a signal through the internal capsule and down the corticospinal tract. Decussation of the lateral corticospinal tract occurs in the medullary pyramids, then the fibres continue down the contralateral side of the spinal cord.
The plantaris muscle is involved in plantar flexion of the foot at the ankle joint and in knee flexion at the knee joint. However, it only weakly assists the gastrocnemius and soleus muscles in performing these movements. The muscle is also thought to provide proprioceptive feedback information to the central nervous system regarding the position of the foot.
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Plantaris muscle ruptures are the most common injury
The plantaris muscle is a thin, cord-like structure located in the posterior compartment of the leg, deep to the gastrocnemius muscle and lateral to the Achilles tendon. It originates from the lateral supracondylar line of the femur and inserts into the medial side of the Achilles tendon, although variations in its anatomy have been noted. The plantaris muscle functions to flex the knee joint and assist in plantarflexion of the ankle, playing a role in stabilizing the lower leg during movement. While the plantaris muscle has a relatively insignificant contribution to ankle plantarflexion compared to the larger calf muscles, its tendon can still be subjected to significant stress during certain activities.
The diagnosis of a plantaris muscle rupture is usually made based on clinical examination and the patient's history of the injury. During the physical examination, a gap or defect may be palpable in the region of the ruptured tendon. Ultrasound imaging can also be used to confirm the diagnosis, visualize the extent of the tear, and rule out other possible injuries to the Achilles tendon or surrounding structures. Magnetic resonance imaging (MRI) may be employed if there is suspicion of associated injuries or if the diagnosis remains unclear.
The treatment for a plantaris muscle rupture typically involves conservative management, as the muscle and tendon have limited functional significance. Initial treatment focuses on relieving pain and reducing inflammation. Rest, ice, compression, and elevation (RICE protocol) are recommended in the acute phase, along with the use of non-steroidal anti-inflammatory drugs (NSAIDs) to manage pain and swelling. A gradual return to activity can usually begin once the initial symptoms have resolved, typically within a few weeks.
Complete tears that result in substantial functional impairment or symptoms that persist despite conservative management may require surgical intervention. Surgical repair or debridement of the ruptured tendon can be considered, especially in athletes or individuals who participate in high-demand physical activities. However, surgery is generally not necessary, as the plantaris muscle has minimal impact on overall ankle function. The decision to proceed with surgery is based on individual circumstances and the presence of associated injuries that may require surgical repair.
In summary, plantaris muscle ruptures are the most common injury related to this muscle, typically occurring during explosive lower limb movements. Diagnosis is made through clinical examination and imaging techniques, while treatment usually involves conservative management with rest, ice, compression, elevation, and NSAIDs. Most patients recover well and can return to their previous level of activity within a few weeks. Surgical intervention is rarely necessary, reserved only for specific cases with significant functional impairment or associated injuries.
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It is considered a vestigial muscle
The plantaris muscle is a small muscle with a short belly and a long, slender tendon. It is located in the calf of the leg, extending behind the knee and into the sural region (calf) of the posterior leg. The plantaris muscle is one of the superficial muscles of the superficial posterior compartment of the leg, one of the fascial compartments of the leg. It is composed of a thin muscle belly and a long, thin tendon. The plantaris tendon is the longest tendon in the human body, measuring between 30 and 45 centimetres in length. The plantaris muscle itself is approximately 5 to 10 centimetres long and is absent in 8 to 12% of the population.
The plantaris muscle is considered a vestigial muscle due to its slender structure and seemingly minor contribution to the two larger muscles with which it is associated—the soleus and gastrocnemius muscles. Together, these three muscles form the triceps surae, which plantarflexes the foot through the Achilles tendon. However, recent evidence suggests that each of the three muscles in the triceps surae has unique properties that contribute to the overall function of this muscle group. The plantaris muscle, in particular, serves a proprioceptive function, providing a kinesthetic sense of limb position and muscle contraction.
While the plantaris muscle has a minimal motor function, its role in providing sensory feedback to the central nervous system about the position of the foot is significant. This sensory function is supported by the high density of proprioceptive receptor end organs in the muscle. Additionally, the plantaris muscle's long tendon can be harvested for reconstruction elsewhere with little functional deficit, further suggesting its vestigial nature. However, some studies dispute the idea that the plantaris muscle is vestigial, arguing that it is a developing muscle with important morphological variability.
The debate around the vestigial nature of the plantaris muscle highlights the ongoing evolution of our understanding of muscle function. While initially considered insignificant due to its small size and weak contractile strength, the plantaris muscle is now recognized as a highly specialized sensory muscle. This shift in perspective underscores the importance of considering both the motor and sensory functions of muscles when assessing their role and significance in the human body.
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Frequently asked questions
The plantaris muscle is located in the posterior compartment of the leg.
The plantaris muscle acts with the gastrocnemius to provide weak plantar flexion of the foot and weak flexion of the knee.
The plantaris muscle consists of a short, fusiform belly (7-10 cm) and a long, thin tendon.
The plantaris muscle is often associated with calf pain and injuries, particularly tennis leg, a condition caused by a partial rupture of the muscle.
The plantaris muscle is considered a vestigial muscle, meaning it is not essential for human survival or function. However, some studies suggest that it may have important clinical value.
