Nerve And Vascular Anatomy

and vascular nerve anatomy sensation and motor functions are specific to individual spinal nerves dermatome sensory information being sent back to the spinal cord you are focusing on the nerve that provides sensory information to an area of skin there is some variation in dermatomes between individuals expect to see slight differences based on various sources myotome motor information sent from the brain and spinal cord to the skeletal muscle structure you looking for weakness in motion and relating that to a specific never root L1-L3 Ll : the inguinal region and the very top of the medial thigh L2 : the middle and lateral aspect of the anterior thigh L3 : the medial epicondyle of the femur lower leg= (4 and L5 runscowthe mediahalfofthelowelaa S1 the lateral : aspect of the calcaneus and posterior calf pay attention to LS this is where you are you see most disk eruptions looking for tingling and numbness in the lateral aspect of the lower leg S2-S5 S2 at the midpoint of the popliteal Fossa : S3/4/5 the perional area : myotomestesting strength of these actions Ll-2 hip flexion : 13 : Knee extension 14 ankle dorsiflexion : L5 : great the extension Sl ankle : S2 plantar-flexion/ankle eversion Knee Flexion/hip : extension following the branches sciatic back of the leg the Following nerves branch from the sciatic Tibial (largest medial terminal of the sciatic nervel common peroneal the common peroneal divides into deep peroneal and the superficial peroneal femoral Front of the leg the following nerves branch from the femoral nerve cutaneous nerve saphenous nerve sciatic 24-S3 16 to 20 mm wide in adults piriformis lies anterior to the sciatic innervations the sciatic nerve innervates the biceps Femoris , semitendinosus , semimembranosus , and part of the adductor magnus Following Sciatic ((4 15 S1 , , , S2 , 53) the sciaticherve branches into two division (the tibial division (posterior tibial andthe peroneal division /lateral aspect toward the head of the fibula , tibial nerve /14 , 15 S1 , 52 53) , , the tibial nerve innervates the gastroc and soleus tibialis posterior,flexor hallious longus , , and flexor digitorum longus posterior leg and plantar surface of the foot common peroneal nerve (L4 15 , innervates the , S1 , S2 , 53) peroneals tibialis anterior , , extensor digitorum longus , extensor hallious longus works all the stuff in the front quadrant of the lower leg Trauma to the nerve results in a condition called foot drop femoral nerve L2 , 13, 24 overt the pelvic arch to the anterior thigh the femoralnerve innervates the iliacus , sartorius , rectus femoris , pectineus, and vastus muscles Call hip flexors and extensors of the knee that is everything in the anterior region of the femur muscular innervations the quads are innervated by the femoral nerve and the hamstrings by the sciatic nerve obturator nerve (L2 , L3 , and L4) the lower obturator nerve is responsible for the motor innervation of the adductor muscles of the extremity (adductor longus , adductor brevis , adductor magnus, gracilis) gluteal nerves (L4 L5 S1 and S2) , the superior , nerve that originates in the pelvis which supplies the gluteus gluteal nerve is a medius ,the gluteus minimus , and the tensor Fascial latae muscles the inferior gluteal nerve is a nerve in the musche pelvis that innervates the gluteus maximus