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Femoral nerve lesion - motor loss
Hip Flexors:
i. Pectineus - Loss of adduction, flexion, and medial rotation of the hip
ii. Iliacus - Loss of flexion and stabilization of the hip joint
iii. Sartorius - (a)Loss of flexion, abduction, and lateral rotation of the hip& (b)Loss of knee flexion
Knee Extensors
Quadriceps femoris (rectus femoris, vastus lateralis, vastus medialis, vastus intermedius) (a)Loss of knee extension & stabilization (b)Loss of hip flexion (rectus femoris)
Femoral nerve lesion - sensory loss
Anterior femoral cutaneous nerve - Loss of anteromedial thigh sensation
Saphenous nerve - Loss of sensation to skin & fascia on anteromedial aspects of the knee, leg, & foot
Femoral nerve lesion - motor disabilities
a. Problems with standing, walking, and running
b. Voluntary knee extension
c. Voluntary hip flexion - [Note: small amount of hip flexion remains via tensor fasciae latae m.]
d. Knee extension reflex/myotatic reflex (areflexia)
-Lower motor neuron damage
e. Neurogenic atrophy
-Results in the feeling of the leg/knee giving out
Femoral nerve lesion
-Femoral n. (L2-L4) originates in the abdomen from LS plexus and descends posterolaterally to reach the inguinal lig.
-Enters femoral triangle, lat. to the vessels, divides in to several branches to the ant. thigh mm., cutaneous brr. to anteromedial side of thigh
-Gives rise to saphenous n. which supplies skin of anteromedial knee, leg, & foot
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