Page 496 - First Aid for the USMLE Step 1 2020, Thirtieth edition [MedicalBooksVN.com]_Neat

452 section iii Musculoskeletal, skin, and connective tissue ` anatomy and physiology Musculoskeletal, skin, and connective tissue ` anatomy and physiology

Lower extremity nerves
nERVE innERVation CaUsE oF inJURy pREsEntation/CommEnts
Iliohypogastric Sensory—suprapubic region Abdominal surgery Burning or tingling pain in
(T12-L1) Motor—transversus abdominis surgical incision site radiating
and internal oblique to inguinal and suprapubic
region
Genitofemoral nerve Sensory—scrotum/labia Laparoscopic surgery  upper medial thigh and
(L1-L2) majora, medial thigh anterior thigh sensation
Motor—cremaster beneath the inguinal
ligament (lateral part of the
femoral triangle); absent
cremasteric reflex
Lateral femoral Sensory—anterior and lateral Tight clothing, obesity,  thigh sensation (anterior and
cutaneous (L2-L3) thigh pregnancy, pelvic procedures lateral)
Obturator (L2-L4) Sensory—medial thigh Pelvic surgery  thigh sensation (medial) and
Motor—obturator externus, adduction
adductor longus, adductor
brevis, gracilis, pectineus,
adductor magnus

Femoral (L2-L4) Sensory—anterior thigh, Pelvic fracture  leg extension ( patellar
medial leg reflex)
Motor—quadriceps, iliacus,
pectineus, sartorius

Sciatic (L4-S3) Motor—semitendinosus, Herniated disc, posterior hip Splits into common peroneal
semimembranosus, biceps dislocation and tibial nerves
femoris, adductor magnus

FAS1_2019_11-Musculo.indd 452 11/7/19 5:23 PM