<prompt> Which lower limb aery is difficult to palpate?Popliteal aeryAnterior tibial aeryPosterior tibial aeryDorsalis pedis aery  <response>: POPLITEAL AERY:- Continuation of femoral aery.Begins at adductor hiatus. Runs downwards and laterally to reach lower border of popliteus.Terminates by dividing into anterior and posterior tibial aeries. Relations:-1. Anteriorly- popliteal surface of femur, back of knee joint, fascia covering popliteus.2. Posterior - tibial nerve.3. Lateral- biceps femoris, plantaris, lateral head of gastrocnemius and lateral condyle of femur.4. Medial-semimembranosus, medial condyle of femur. Branches:-1. Muscular- adductor Magnus, hamstrings, gastrocnemius, soleus, plantaris.2. Cutaneous3. Genicular- superior, middle and inferior. Middle -pierces oblique popliteal ligament. Supplies cruciate ligament and synol membrane of knee joint. BP of lower limb measured from popliteal aery.In coarctation of aoa, popliteal pressure brachial pressure.Popliteal aery is fixed to capsule of knee joint by a fibrous band present just above the femoral condyles. This may be a source of continuous traction or stretching in the aery, causing primary thrombosis of aery.More prone to aneurysm. Dorsalis pedis- can be easily at proximal end of first intermetatarsal space. i.e .between the tendons of EHL and first tendon of EDL. Anterior tibial aery- palpable at midway between two malleolus Posterior tibial aery- pulsation felt at 2 cm behind and below medial malleolus. 