Knowledge wrote:
The tendon behind the achilles tendon is the soleus and your so called plantaris tendon would have something to do with the foot.
Wrong. The "achilles tendon" is made up of three tendons forming into one sheath - the tendons are from the soleus, the gastrocnemius, and the plantaris. The soleus is primarily a postural muscle and is very slow (but is quite important in ankle stabilization during activities like distance running). The gastrocnemius is the most visible muscle of the calf (the ball, the upside down heart shaped muscle, whatever you call it). And the plantaris is very small muscle (in humans anyway) that attaches up high on the tibia (behind and under the knee) and the tendon is this long spindly thing that runs down between the soleus and the gastrocnemius. The plantaris doesn't really do much in humans, but it is actually the second largest of those three muscles in rodents...like you care about that.