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Lower Extremity Nerves
Terms in this set (18)
T12 and L1 come together to make what nerve? What does it innervate?
Sensory to the suprapubic area and motor to the transversus abdominus and internal olbigue
Usually injured during abdominal surgery and the pain may radiate to the groin.
L1 and L2 come together to make what nerve? What does it innervate?
Sensory to the scrotum/labia majora as well as th anterior medial thigh area, motor to the cremaster.
L2 and L3 come together to make what nerve? What does it innervate?
Lateral Femoral Cutaneous nerve
Sensory to the anterior and lateral thigh. Injured ofen by tight clothing, obesity and pregnancy
L3 and L4 with some help from L2 come together to make what two nerves?
Obturator and Femoral nerves
What does the obturator nerve innervate
Sensory to the medial thigh and motor to the obturator externus, adductor longus, adductor brevis, gracilis, pectineus, and adductor magnus.
As you can imagine, pelvic surgery in this area could leave you without the ability to adduct.
What does the femoral nerve innervate??
Sensory is the anterior thigh and medial leg. Motor is the quadriceps, iliopsoas, pectineus and sartorius.
This is often damaged during a pelvic fracture, leading to decreased thigh flexion and leg extension.
L4 - S3 come together to make the sciatic nerve, which splits into the tibial nerve and this nerve? What does it innervate?
Common peroneal nerve (Only the L4 - S2 part though)
Sensory to the dorsum of the foot, motor to the biceps femoris, tibialis anterior, extensor muscles of the foot.
Commonly injured during fracture to the neck of the fibula, and leads to foot drop (steppage gait) which is loss of eversion and dorsiflexion.
Sciatic nerve innervates what?
Sensory to the posterior thigh. Motor to the semitendinosus, semimembranosus, biceps femoris, adductor magnus. This is the nerve that splits into the common peroneal and the tibial nerves.
Tibial nerve, a branch of the sciatic, innervates what?
Sensory to the sole of the foot. Motor to the triceps surae, plantaris, popliteus, flexor muscles of the foot.
Common injuries are 2/2 knee trauma, Baker cyst, tarsal tunnel syndrome.
Can't plantar flex or invert.
Superior gluteal nerve comes off of what?
L4 - S1
Motor to the gluteus medius and minimus and the tensor fascia latae
Injured during intramuscular injection to the upper medial gluteal region. You'll see trendelenberg.
Inferior gluteal is made up of what?
Motor to the gluteus maximus.
Injured during a posterior hip dislocation and the patient will have difficulty climbing stairs, rising from a seated position, and will have loss of hip extension
Pudendal nerve is made from what fibers?
S2 - S4
Sensory to the perineum and motor to the external urethral and anal sphincters. Usually injured as a stretch injury in childbirth.
What muscles abduct your hip?
Gluterus medius and minimus
What muscles adduct your hip
The ones with adductor in their name
Adductor magnus, longus, brevis
What muscles extend your hip?
Gluteus maximus, semitendinosus, semimembranosus
What muscles flex your hip?
Iliopsoas, rectus femoris, tensor fascia lata, pectineus
What muscles internally rotate your hip
Gluteus medius, minimus, and tensor fascia lata
What muscles externally rotate your hip?
Iliopsoas, gluteus maximus, piriformis and obturator
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