The anterior crural septum divides the muscles in front of and lateral to the two bones into an anterior compartment, which contains four muscles including tibialis anterior, and a more laterally placed peroneal compartment, which contains two of the three peroneal muscles. These two septa are attached to the fibula here, and here. This is the posterior crural septum, lying just in front of the soleus muscle. To see them, we’ll remove the investing deep fascia down to here, exposing several muscles that we haven’t met yet. The other two septa have cumbersome names: they’re the anterior and the posterior crural intermuscular septa. In this video I told about thigh muscles with their nerve supply and the most important is with tricks here I explained all 3 compartments of the thigh: ante. At the ankle, the transverse septum is continuous with the flexor retinaculum. The transverse septum is thin up here, but toward the ankle it becomes thicker. To see the transverse septum better, we’ll remove the rest of soleus. Three muscles that we haven’t seen yet lie between the transverse septum and the bones. It runs from here on the tibia, to here on the fibula. In front of soleus, this transverse intermuscular septum crosses the back of the leg. Here’s soleus, divided, here’s the investing deep fascia, divided at a lower level. brevis) and red is the anterior (vastus lateralis to sartorius). Green is the medial compartment (gracilis and adductor magnus), blue is the posterior (semimembrosus to biceps c.
We’ll remove gastrocnemius and soleus, down to here. One of the fascial compartments of the leg Posterior compartment of leg Diagram of leg compartments Dissection video of posterior compartment of leg (6 min 39 sec) Details Artery posterior tibial artery Nerve tibial nerve Identifiers Latin compartimentum cruris posterius TA98 A04.7.01. Fascial compartments of thigh Last updated FebruCross section of the thigh showing the fascial compartments in different colors. deeply - popliteus m., tibialis posterior m., flexor.
Together with the interosseous membrane, they divide the muscles of the leg into four compartments, two on the front of the leg, and two on the back. posterior compartment of the leg contains: superficially - gastrocnemius m., soleus m., plantaris m. Now we’ll look at the fibrous septa, the singular of which is septum. Distally the investing deep fascia is continuous with the superficial part of the flexor retinaculum, with the peroneal retinaculum, and with the two parts of the extensor retinaculum. The investing deep fascia wraps around the back of the calcaneal tendon, like a sling. It’s attached to the fibula not directly, but indirectly by two fibrous septa here, and here, that we’ll see in a minute. The investing deep fascia is attached to the tibia here, and here. This outer layer is the investing deep fasica. Before we move on to see the muscles that produce inversion and eversion, we need to digress for two minutes, to look at the layer of deep fascia that surrounds all the muscles of the leg, and the three fibrous partitions, or septa that divide the leg muscles into somewhat distinct compartments.
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