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  1. Dorsal rami L1-3 & S1-3
    function - sensory & postganglionic sympathetic innervation of skin overlying gluteal region
  2. Lumbar plexus
    1. Muscular branches
      1. Iliacus
        function - sensory, postganglionic sympathetic & motor (lmn) innervation
      2. Quadratus lumborum
        function - sensory, postganglionic sympathetic & motor (lmn) innervation
      3. Psoas
        function - sensory, postganglionic sympathetic & motor (lmn) innervation
    2. Iliohypogastric n. (L1)
      function - see Trunk
    3. Ilioinguinal n (L1)
      function - see Trunk
    4. Genitofemoral n. (L1-2, femoral branch)
      function - sensory & postganglionic sympathetic innervation of skin over proximal anterior thigh
    5. Lateral femoral cutaneous n.
      function - sensory & postganglionic sympathetic innervation of the skin overlying the lateral aspect of the thigh
    6. Femoral n. (L2-4)
      1. Saphenous n.
        function - sensory & postganglionic sympathetic innervation of the skin overlying the medial aspect of the leg
      2. Intermediate femoral cutaneous nerve
        function - sensory & postganglionic sympathetic innervation of the skin overlying the anterior aspect of the thigh
      3. Medial femoral cutaneous nerve
        function - sensory & postganglionic sympathetic innervation of the skin overlying the medial aspect of the thigh
      4. Muscular branches
        function - sensory, postganglionic sympathetic & motor (lmn) innervation of the iliacus, pectineus, sartorius, rectus femoris, vastus lateralis, vastus medialis & vastus intermedius muscles
    7. Obturator nerve (L2-4)
      1. Muscular branches
        function - sensory, postganglionic sympathetic & motor (lmn) innervation of the gracilis, adductor brevis, adductor longus, adductor magnus & obturator externus muscles
      2. Accessory obturator n.
        function - sensory, postganglionic sympathetic & motor (lmn) innervation of the pectineus (when this nerve is present)
      3. Cutaneous branch
        function - sensory & postganglionic sympathetic innervation of the skin overlying the medial aspect of proximal thigh
  3. Sacral Plexus (Lumbosacral Trunk [L4-5] & S1-3)
    1. Muscular branches of the plexus
      1. Nerve to the piriformis
        function - sensory, postganglionic sympathetic & motor (lmn) innervation of the piriformis muscle
      2. Nerve to the quadratus femoris
        function - sensory, postganglionic sympathetic & motor (lmn) innervation of the quadratus femoris & inferior gemellus m.
      3. Nerve to the obturator internus
        function - sensory, postganglionic sympathetic & motor (lmn) innervation of the obturator internus & superior gemellus m.
    2. Superior gluteal nerve
      function - sensory, postganglionic sympathetic & motor (lmn) innervation of the gluteus medius, gluteus minimis & tensor facia lata m.
    3. Inferior gluteal nerve
      function - sensory, postganglionic sympathetic & motor (lmn) innervation of the gluteus maximus m.
    4. Posterior femoral cutaneous nerve
      function - sensory & postganglionic sympathetic innervation of the skin overlying the posterior thigh & popliteal fossa
    5. Sciatic nerve - tibial division
      1. Muscular branches
        function - sensory, postganglionic sympathetic & motor (lmn) innervation of the semimembranosus, semitendinosus, biceps femoris (long head) & adductor magnus m.
      2. Tibial nerve
        1. Sural n.
          function - sensory & postganglionic sympathetic innervation of the skin overlying lateral aspect of the leg & foot
        2. Muscular branches
          function - sensory, postganglionic sympathetic & motor (lmn) innervation of the gastrocnemius, soleus, plantaris, popliteus, tibialis posterior, flexor digitorum longus & flexor hallucis longus muscles
        3. Medial calcaneal branches
          function - sensory & postganglionic sympathetic innervation of the skin overlying medial heal
        4. Medial plantar n.
          function - sensory, postganglionic sympathetic & motor (lmn) innervation of the medial muscles of the plantar surface of the foot (abductor hallucis, flexor digitorum brevis, flexor hallucis brevis & 1st lumbrical), and skin (sensory & postganglionic sympathetic) overlying medial aspect of plantar surface
        5. Lateral plantar n.
          function - sensory, postganglionic sympathetic & motor (lmn) innervation of the lateral muscles of the plantar surface of the foot abductor digiti minimi, adductor hallucis, flexor digitorum accessorius, flexor digiti minimi, dorsal interossei, palmar interossei & 2nd-4th lumbricals) and skin (sensory & postganglionic sympathetic) over the lateral aspect of the plantar foot
    6. Sciatic nerve - peroneal (fibular) nerve
      1. Muscular branch to short head of biceps femoris
        function - sensory, postganglionic sympathetic & motor (lmn) innervation of the short head of the biceps femoris
      2. Common peroneal (fibular) n.
        1. Lateral sural n.
          function - sensory & postganglionic sympathetic innervation of the skin overlying the lateral aspect of the leg
        2. Deep peroneal (fibular) n.
          function - sensory, postganglionic sympathetic & motor (lmn) innervation of the tibialis anterior, extensor hallucis longus, extensor digitorum longus & peroneus tertius m., and skin (sensory & postganglionic sympathetic) overlying the dorsal 1st & 2nd toes
        3. Superficial peroneal (fibular) n.
          function - sensory, postganglionic sympathetic & motor (lmn) innervation of the peroneus longus & brevis m., and skin (sensory & postganglionic sympathetic) overlying distal lateral leg & dorsum of foot

Overview