All neuromuscular branches of triceps surae originate from tibial nerve, with the level of medial epicondyle of femur as the marker point, and the starting point of each neuromuscular branch is between 1.5cm and 3.2cm below the marker point.
The starting point of the proximal neuromuscular branch of soleus muscle is mostly below or on the plane of the landmark, with 17% emitting above the landmark, but all within 1.0cm. The number of muscle branches is 1-2. The distance between the marker point and the muscular portal is (4.71.0) cm. There are 6 terminal branches, of which one is the most common. The length of terminal branch outside muscle is (1.3 0.5) cm.
Extended data:
Leg muscles are divided into anterolateral group, posterior group and medial group. The quadriceps femoris is the anterolateral group and one of the most powerful muscles in human body. It includes rectus muscle, middle thigh muscle, outer thigh muscle and inner thigh muscle. The function of these four muscles is to keep the femur vertical to keep the human body upright and help squat and stand up.
The anterolateral group also has sartorius muscle and tensor fascia lata muscle, one of the longest muscles in the human body. The former can bend and rotate the thigh and bend and rotate the calf, such as leg movements when kicking shuttlecock; The latter can bend and pronate the thigh, and can also have biceps femoris, semitendinosus and semitendinosus muscles in the muscles of the posterior group of the thigh.
The function of biceps femoris is to bend and rotate the calf and extend the thigh backward; The functions of semitendinosus and semimembranous muscles are the same as those of biceps femoris, except that the calf is internally rotated. The muscles in the medial group are adductor muscle, pubis, adductor brevis, adductor longus and gracilis. These muscles ensure the adduction, external rotation, backward extension and bending of the thigh and the bending and internal rotation of the calf.
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