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Illustration of sciatic nerve shows the L4-S3 spinal nerves, the sciatic notch, piriformis muscle, common fibular and tibial nerves. Description of sciatica and common causes of sciatica.

The common peroneal nerve, also known as the common fibular nerve, external popliteal nerve, peroneal nerve, or lateral popliteal nerve, is formed from the L4, L5, S1, and S2 nerve roots

Biceps femoris muscle long head Origin tuberosity of the ischium, linea aspera, femur Insertion the head of the fibula which articulates with the back of the lateral tibial condyle Artery inferior gluteal artery, perforating arteries, popliteal artery Nerve long head: tibial nerve short head: common fibular nerve Actions flexes knee joint, laterally rotates knee joint (when knee is flexed), extends hip joint (long head only) Antagonist Quadriceps muscle


Pez anserinus- mnemonic: SGT FOT (sergeant FOT).S- Sartorius G- Gracilis T- semiTendinosus (from medial to lateral) F- femoral nerve O- obturator nerve T- tibial nerve. The sciatic nerve itself cannot technically innervate anything because it is merely the designation for the common sheath that encases the tibial and common fibular nerves.) Notice the order of the muscles (S, G, T) follows the order of the innervating nerves which correspond to those muscles (F, O, T)