Posterior Thigh Muscles PDF

1 Posterior Thigh a. Overview i. Primary function: knee flexion, hip extension ii. All are innervated by tibial nerve except one (which one??) ...

1 Posterior Thigh a. Overview i. Primary function: knee flexion, hip extension ii. All are innervated by tibial nerve except one (which one??)  2 b. Muscles of the Posterior Thigh Muscles Proximal attachment Distal attachment Innervation Main action Extend thigh, flex leg and rotate it medially Tibial division of sciatic Medial surface of when knee is flexed Semitendinosus Ischial tuberosity nerve part of tibia L5, superior part of tibia when thigh and leg are S1, S2 flexed these muscles can extend trunk Posterior part of Extend thigh, flex leg medial condyle of and rotate it medially Tibial division of sciatic tibia, reflected when knee is flexed Semimembranosus Ischial tuberosity nerve part of tibia L5, attachment forms when thigh and leg are S1, S2 oblique popliteal flexed these muscles ligament can extend trunk Long head: tibial Lateral side of head Long head: ischial tub division of sciatic of fibula tendon is Flexes leg and rotates it Short head: linea aspera nerve Biceps femoris split at this site by laterally when knee is and lateral supracondylar Short head: common fibular collateral flexed extends thigh line of femur fibular division of ligament of knee sciatic nerve L5, S1, 2 c. Blood Supply to Posterior Thigh i. Four perforating branches of profunda femoris artery (pass through adductor magnus) ii. Each branch forms superior and inferior branches that anastomose with each other to form a longitudinal anastomosis in the posterior thigh. iii. Superiorly the anastomosis meets the superior gluteal artery, while inferiorly it meets arteries of the knee (genicular arteries). (Moore, Dalley & Agur, 2010)  3 2. Review in Cross Section a. Try to get oriented to the muscle organization in cross section (lots more on this in lab) b. Appreciate how vastus lateralis wraps around the lateral femur to the posterior c. Examine the organization of the neurovascular supply with respect the muslces/compartments d. Identify the medial, anterior and posterior compartments (Moore, Dalley & Agur, 2010)  4 3. Innervation to the thigh a. Sensory Innervation b. Dermatomes in the thigh