BACK OF THIGH CONTENTS HAMSTRING SHORT HEAD OF

BACK OF THIGH

CONTENTS �HAMSTRING �SHORT HEAD OF BICEPS FEMORIS �SCIATIC NERVE �POSTERIOR NERVE �A MUSCLES FEMORAL CUTANEOUS CHAIN OF VASCULAR ANASTOMOSIS AT THE BACK OF ADDUCTOR MAGNUS

HAMSTRINGS �SEMIMEMBRANOSUS �SEMITENDINOSUS �LONG HEAD OF BICEPS FEMORIS �HAMSTRING MAGNUS PART OF ADDUCTOR

ACTIONS OF HAMSTRINGS �Flexion Of Knee �Extension Of Hip Joint Especially In Standing And Walking �In Semiflexed Knee, the Semimembranosus And Semitendinosus Acts As Medial Rotators And Biceps Femoris Acts As Lateral Rotator Of Tibia On Femur

SCIATIC NERVE � Thickest nerve in the body � It begins in the pelvis and terminate s at the superior angle of popliteal fossa by dividing into tibial and common peroneal nerves. � Origin; Largest branch of sacral plexus. � Root value; L 4, L 5, S 1, S 2, S 3 � Tibial nerve from its ventral division-L 4, 5, S 1, 2, 3 � Common peroneal nerve form dorsal division – L 4, 4, S 1, S 2

COURSE & RELATIONS �In the pelvis ; nerve lies infront of piriformis the gluteal region ; enters gluteal region through greater sciatic foramen, passing between ischial tuberosity and greater trochanter. �Superficially it is related to gluteus maximus, posterior cutaneous nerve of thigh �Deeply it is related to body of ischium, tendon of obturator internus, gamelli, obturator externus and quadratus femoris �Medially – inferior gluteal nerve , and vessels.

Sciatic nerve in the thigh �It enters the thigh at the lower border of gluteus maximus and runs vertically downwards up to the superior angle of popliteal fossa , where it terminates by dividing into tibial and common peroneal nerves. �Superficially it is related to long head of biceps femoris �Deeply it is related to adductor magnus �Medially- post. cut. nerve of thigh , semimembranosus, and semitendinosus.

Branches �Articular branch to hip joint �Muscular branch for hamstrings(tibial part) �Short head of biceps by common peroneal nerve

Applied Anatomy �Sleeping foot; compression of sciatic nerve against femur �Sciatica �Foot drop

Arteries of the back of thigh �Terminal artery part of profunda femoris �Lateral circumflex artery �Medial circumflex artery �Perforating branches of profunda femoris artery.