<prompt> The chief source of blood supply to head and neck of femur is derived fromAcetabular branches of obturator aeryAcetabular branches of medial circumflex femoral aeryRetinacular branches of medial circumflex femoral aeryNutrient aery of femur  <response>: The head of the femur is paly supplied by a branch of obturator aery along the ligamentum teres.Main aerial supply is from retinacular aeries, branches of the medial femoral circumflex aery.These aeries get injured in intracapsular fracture of neck of femur, leading to avascular necrosis of the head.BDC 6th edition Abdomen lower limb pg: 32 