Plantaris muscle

plantaris
The plantaris is one of the superficial muscles of the superficial posterior compartment of the leg, one of the fascial compartments of the leg.wikipedia
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Tibial nerve

tibialtibial '''n'''ervetibial branch
The plantaris muscle is innervated by the tibial nerve, a branch of the sciatic nerve in the sacral plexus.

Posterior compartment of leg

posterior compartment of the legposterior compartmentDeep posterior compartment
The plantaris is one of the superficial muscles of the superficial posterior compartment of the leg, one of the fascial compartments of the leg.

Gastrocnemius muscle

gastrocnemiusCalvescalf
It is one of the plantar flexors in the posterior compartment of the leg, along with the gastrocnemius and soleus muscles. The plantaris muscle arises from the inferior part of the lateral supracondylar ridge of the femur at a position slightly superior to the origin of the lateral head of gastrocnemius.
The plantaris muscle and a portion of its tendon run between the two muscles, which is involved in "locking" the knee from the standing position.

Soleus muscle

soleus
It is one of the plantar flexors in the posterior compartment of the leg, along with the gastrocnemius and soleus muscles.
The plantaris muscle and a portion of its tendon run between the two muscles.

Femur

femorathigh bonefemoral
The plantaris muscle arises from the inferior part of the lateral supracondylar ridge of the femur at a position slightly superior to the origin of the lateral head of gastrocnemius.
Some biarticular muscles – which cross two joints, like the gastrocnemius and plantaris muscles – also originate from the femur.

Fascial compartments of leg

fascial compartments of the legfascial compartmentleg compartments
The plantaris is one of the superficial muscles of the superficial posterior compartment of the leg, one of the fascial compartments of the leg.

Sacral plexus

sacralsacral plexaSacral plexopathy
The plantaris muscle is innervated by the tibial nerve, a branch of the sciatic nerve in the sacral plexus.

Calcaneus

calcaneumheel bonesustentaculum tali
It occasionally separately inserts into the medial side of the calcaneus.
Three muscles insert on the calcaneus: the gastrocnemius, soleus, and plantaris.

Achilles tendon

AchillesAchilles' tendoncalcaneal tendon
While not as thick as the achilles tendon, the plantaris tendon (which tends to be between 30-45 cm in length) is the longest tendon in the human body. It passes posterior to the knee joint in an inferomedial direction and becomes tendinous distally to insert into the Achilles tendon.
It serves to attach the plantaris, gastrocnemius (calf) and soleus muscles to the calcaneus (heel) bone.

Sural arteries

sural arteryInferior muscular arterysural
The sural arteries (inferior muscular arteries) are two large branches, lateral and medial, which are distributed to the gastrocnemius, soleus, and plantaris muscles.

Knee

knee injuryknee jointknees
It passes posterior to the knee joint in an inferomedial direction and becomes tendinous distally to insert into the Achilles tendon.

Muscle

musclesmuscularmusculature
The plantaris is one of the superficial muscles of the superficial posterior compartment of the leg, one of the fascial compartments of the leg.

Tendon

tendonssinewtendinous
It is composed of a thin muscle belly and a long thin tendon.

Human body

bodyhuman anatomyhuman physiology
While not as thick as the achilles tendon, the plantaris tendon (which tends to be between 30-45 cm in length) is the longest tendon in the human body.

Lateral supracondylar ridge

The plantaris muscle arises from the inferior part of the lateral supracondylar ridge of the femur at a position slightly superior to the origin of the lateral head of gastrocnemius.

Sciatic nerve

sciaticischiadic nerveright sciatic nerve
The plantaris muscle is innervated by the tibial nerve, a branch of the sciatic nerve in the sacral plexus.

Frontal lobe

frontal cortexfrontalfrontal lobes
Signaling for contraction begins in the frontal lobe of the brain with the pre-central gyrus (primary motor cortex).

Human brain

brainbrain tissuebrains
Signaling for contraction begins in the frontal lobe of the brain with the pre-central gyrus (primary motor cortex).

Primary motor cortex

primary motor areaprimary motorprefrontal gyrus
Signaling for contraction begins in the frontal lobe of the brain with the pre-central gyrus (primary motor cortex).

Upper motor neuron

upper motor neuronsupperUMN
Upper motor neurons are stimulated and send a signal through the internal capsule and down the corticospinal tract.

Internal capsule

genugenu of the internal capsuleposterior limb of internal capsule
Upper motor neurons are stimulated and send a signal through the internal capsule and down the corticospinal tract.

Corticospinal tract

pyramidal tractcorticospinalcorticospinal (pyramidal) tract
Upper motor neurons are stimulated and send a signal through the internal capsule and down the corticospinal tract.

Lateral corticospinal tract

lateral
Decussation of the lateral corticospinal tract occurs in the medullary pyramids, then the fibers continue down the contralateral side of the spinal cord.

Medullary pyramids (brainstem)

medullary pyramidsdecussation of the pyramidspyramid
Decussation of the lateral corticospinal tract occurs in the medullary pyramids, then the fibers continue down the contralateral side of the spinal cord.