Human Anatomy 2300--NERVES OF THE LOWER LIMBS
Human Anatomy 2300--NERVES OF THE LOWER LIMBS Anatomy 2300
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This 2 page Class Notes was uploaded by Isabella Bowling on Wednesday April 6, 2016. The Class Notes belongs to Anatomy 2300 at Ohio State University taught by Dr. Burgoon in Spring2015. Since its upload, it has received 23 views. For similar materials see Human Anatomy in Anatomy at Ohio State University.
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Date Created: 04/06/16
Anatomy 2300 Lec #10 NERVES OF THE LOWER LIMBS --Spinal nerves connect to the spinal cords. 31 pairs. A dorsal and ventral root merge to form the spinal nerve which exits through an intervertebral foramen and splits into a dorsal and ventral rami. The dorsal rami innervate a 3inch strip down the back, while the ventral rami form plexuses to innervate the rest of the body. --T1(part of it)—T12 do NOT form plexuses intercostal nerves. --Plexus = the fibers of the nerves reorganize themselves to ensure we won’t be completely paralyzed if something happens to one point on the spine. The axons will come from many levels still some, maybe weaker, innervation still at the muscle. Lumbar Plexus --T12 & L1—L4 of the Ventral Rami --Forms in front of the transverse processes of the lumbar vertebrae. --Nerves include: femoral and obturator nerve… provide innervation for the muscles of the anterior and medial thigh. --Femoral nerve --Largest nerve of lumbar plexus --Enters thigh by passing under the inguinal ligament (which runs from ASIS to pubic tubercle). --Innervates the iliacus, pectineus, and anterior femoral muscles. --Obturator nerve --Passes through the obturator foramen to enter the medial thigh --Innervates most medial femoral muscles. Sacral Plexus --Lies within the true pelvis, on the posterior and partially lateral sides. --L4, L5, & S1—S4 Ventral Rami --Nerves include: superior gluteal nerve, inferior gluteal nerve, sciatic nerve, tibial nerve… provides innervation for the muscles of the posterior thigh and all of the leg and foot muscles. --Superior gluteal nerve --exits pelvis through the greater sciatic foramen superior to the piriformis muscle --Innervates gluteus medius, gluteus minimus, and tensor fasciae latae --Inferior gluteal nerve --exits pelvis through the greater sciatic foramen inferior to piriformis muscle --innervates the gluteus maximus muscle --Sciatic nerve --largest nerve in the body --exits pelvis through the grater sciatic foramen inferior to the piriformis --2/3’s of the way down the thigh divides into tibial (medial) and common fibular (peroneal) nerve (lateral) --Tibial nerve --medial division of sciatic nerve. ---found in popliteal fossa --Innervates most of the posterior femoral muscles and posterior crural muscles --Divides into the lateral and medial plantar nerves (for the sole of the foot) --Common fibular (peroneal) nerve --lateral division of sciatic nerve --Innervates the short head of the biceps femoris --Wraps around the neck of fibula (very vulnerable here!!) --Divides into the superficial and deep fibular (peroneal) nerves. --Superficial fibular (peroneal) nerve --lateral branch of common fibular nerve --Innervates the lateral crural muscles --Deep fibular (peroneal) nerve --medial branch of the common fibular nerve --innervates the anterior crural muscles --passes into dorsum of foot to innervate the intrinsic muscle there.
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