Podcast
Questions and Answers
Which nerve is responsible for providing sensation to the scrotum and labia majora?
Which nerve is responsible for providing sensation to the scrotum and labia majora?
What is the primary motor function of the Superior Gluteal nerve?
What is the primary motor function of the Superior Gluteal nerve?
Which nerve is most commonly associated with the condition known as Meralgia Paresthetica?
Which nerve is most commonly associated with the condition known as Meralgia Paresthetica?
Which of the following nerve injuries could result in a loss of sensation on the sole of the foot?
Which of the following nerve injuries could result in a loss of sensation on the sole of the foot?
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Which nerve is responsible for providing motor innervation to the muscles involved in eversion of the foot?
Which nerve is responsible for providing motor innervation to the muscles involved in eversion of the foot?
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Which of the following is NOT a potential cause of injury to the Obturator nerve?
Which of the following is NOT a potential cause of injury to the Obturator nerve?
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What is the most common presenting symptom of a Lateral Femoral Cutaneous nerve injury?
What is the most common presenting symptom of a Lateral Femoral Cutaneous nerve injury?
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Which of the following nerves is responsible for providing sensory innervation to the suprapubic region?
Which of the following nerves is responsible for providing sensory innervation to the suprapubic region?
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Which of the following nerves is NOT involved in hip flexion?
Which of the following nerves is NOT involved in hip flexion?
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What is a common presentation of an injury to the Tibial nerve?
What is a common presentation of an injury to the Tibial nerve?
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Which of the following is a potential cause of injury to both the Sciatic and Common Peroneal nerves?
Which of the following is a potential cause of injury to both the Sciatic and Common Peroneal nerves?
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Which nerve is primarily responsible for the ability to extend the leg at the knee?
Which nerve is primarily responsible for the ability to extend the leg at the knee?
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What is a common sign of a Common Peroneal nerve injury?
What is a common sign of a Common Peroneal nerve injury?
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Which of the following is NOT a common presentation associated with an injury to the Iliohypogastric nerve?
Which of the following is NOT a common presentation associated with an injury to the Iliohypogastric nerve?
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Which nerve is most likely to be affected by a posterior hip dislocation?
Which nerve is most likely to be affected by a posterior hip dislocation?
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Which nerve is responsible for providing motor innervation to the muscles involved in plantarflexion of the foot?
Which nerve is responsible for providing motor innervation to the muscles involved in plantarflexion of the foot?
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Which nerve is most directly involved in both hip flexion and knee extension?
Which nerve is most directly involved in both hip flexion and knee extension?
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Which of the following nerves is NOT directly involved in the classic 'steppage gait' associated with foot drop?
Which of the following nerves is NOT directly involved in the classic 'steppage gait' associated with foot drop?
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A patient presents with decreased sensation in the webspace between the big toe and second toe. Which nerve is most likely affected?
A patient presents with decreased sensation in the webspace between the big toe and second toe. Which nerve is most likely affected?
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Which nerve is most frequently involved in surgical procedures within the pelvic region?
Which nerve is most frequently involved in surgical procedures within the pelvic region?
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Which nerve is most likely responsible for the ability to perform the following movements: toe curling and foot inversion?
Which nerve is most likely responsible for the ability to perform the following movements: toe curling and foot inversion?
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Which nerve is most commonly affected by compression in a patient with pregnancy or obesity?
Which nerve is most commonly affected by compression in a patient with pregnancy or obesity?
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Which nerve is directly affected by a herniated disc in the lumbar spine, potentially leading to leg pain and weakness?
Which nerve is directly affected by a herniated disc in the lumbar spine, potentially leading to leg pain and weakness?
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A patient has difficulty extending their leg at the knee and reports pain in the anterior thigh. Which nerve is most likely involved based on this presentation?
A patient has difficulty extending their leg at the knee and reports pain in the anterior thigh. Which nerve is most likely involved based on this presentation?
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Which nerve is most likely to be affected by an injury to the leg that results in loss of sensation on the dorsal side of the foot (except for the webspace between the big toe and 2nd toe)?
Which nerve is most likely to be affected by an injury to the leg that results in loss of sensation on the dorsal side of the foot (except for the webspace between the big toe and 2nd toe)?
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Which nerve is most commonly associated with burning or tingling pain in the suprapubic region, often radiating to the groin?
Which nerve is most commonly associated with burning or tingling pain in the suprapubic region, often radiating to the groin?
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A patient has difficulty plantarflexing their foot and reports pain in the calf. Which nerve is most likely involved?
A patient has difficulty plantarflexing their foot and reports pain in the calf. Which nerve is most likely involved?
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Which nerve is most likely to be affected by a pelvic fracture, leading to loss of sensation on the medial thigh?
Which nerve is most likely to be affected by a pelvic fracture, leading to loss of sensation on the medial thigh?
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Which TWO nerves are most commonly affected by compression from a tight clothing or obesity?
Which TWO nerves are most commonly affected by compression from a tight clothing or obesity?
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Which nerve is MOST likely affected in a patient with an inability to flex their knee and pain radiating down the posterior aspect of the thigh and leg?
Which nerve is MOST likely affected in a patient with an inability to flex their knee and pain radiating down the posterior aspect of the thigh and leg?
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Which nerve is responsible for innervating the muscles responsible for hip abduction?
Which nerve is responsible for innervating the muscles responsible for hip abduction?
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Which nerve is most likely to be damaged in a patient presenting with fecal incontinence and loss of sensation in the perineum?
Which nerve is most likely to be damaged in a patient presenting with fecal incontinence and loss of sensation in the perineum?
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Flashcards
Iliohypogastric Nerve
Iliohypogastric Nerve
Innervates transversus abdominis and internal oblique, supplies suprapubic region sensory.
Genitofemoral Nerve
Genitofemoral Nerve
Innervates cremaster muscle, provides sensation to scrotum/labia majora and medial thigh.
Lateral Femoral Cutaneous Nerve
Lateral Femoral Cutaneous Nerve
Supplies sensory to anterior and lateral thigh, no motor innervation.
Obturator Nerve
Obturator Nerve
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Femoral Nerve
Femoral Nerve
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Sciatic Nerve
Sciatic Nerve
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Common Peroneal Nerve
Common Peroneal Nerve
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Tibial Nerve
Tibial Nerve
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Superior Gluteal Nerve
Superior Gluteal Nerve
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Inferior Gluteal Nerve
Inferior Gluteal Nerve
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Pudendal Nerve
Pudendal Nerve
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Meralgia Paresthetica
Meralgia Paresthetica
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Steppage Gait
Steppage Gait
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Pelvic Fracture
Pelvic Fracture
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Compression Syndromes
Compression Syndromes
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Iliohypogastric Nerve Injury
Iliohypogastric Nerve Injury
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Genitofemoral Nerve Functions
Genitofemoral Nerve Functions
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Lateral Femoral Cutaneous Nerve Injury
Lateral Femoral Cutaneous Nerve Injury
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Obturator Nerve Functions
Obturator Nerve Functions
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Femoral Nerve Injury Causes
Femoral Nerve Injury Causes
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Sciatic Nerve Split
Sciatic Nerve Split
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Common Peroneal Nerve Effects
Common Peroneal Nerve Effects
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Tibial Nerve Functions
Tibial Nerve Functions
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Superior Gluteal Nerve Role
Superior Gluteal Nerve Role
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Inferior Gluteal Nerve Functions
Inferior Gluteal Nerve Functions
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Pudendal Nerve Importance
Pudendal Nerve Importance
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Meralgia Paresthetica Symptoms
Meralgia Paresthetica Symptoms
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Steppage Gait Cause
Steppage Gait Cause
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Pelvic Fracture Effects
Pelvic Fracture Effects
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Compression Syndromes Overview
Compression Syndromes Overview
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Study Notes
Lower Extremity Nerves
-
Iliohypogastric nerve (T12-L1):
- Sensory: Suprapubic region
- Motor: Transversus abdominis, internal oblique
-
Genitofemoral nerve (L1-L2):
- Sensory: Scrotum/labia majora, medial thigh
- Motor: Cremaster
-
Lateral femoral cutaneous nerve (L2-L3):
- Sensory: Anterior and lateral thigh
-
Obturator nerve (L2-L4):
- Sensory: Medial thigh
- Motor: Obturator externus, adductor longus, adductor brevis, gracilis, pectineus, adductor magnus
-
Femoral nerve (L2-L4):
- Sensory: Anterior thigh, medial leg
- Motor: Quadriceps, iliacus, pectineus, sartorius, semitendinosus, semimembranosus, biceps femoris, adductor magnus
-
Sciatic nerve (L4-S3):
- Splits into common peroneal and tibial nerves.
- Sensory: Dorsum of foot (except webspace between hallux and 2nd digit), deep peroneal nerve sensory webspace between hallux and 2nd digit, tibial nerve sensory sole of foot.
- Motor: Semitendinosus, semimembranosus, biceps femoris; deep peroneal nerve motor tibialis anterior, superficial peroneal nerve motor peroneus longus and brevis.
-
Common (Fibular) peroneal nerve (L4-S2):
- Sensory: Dorsum of foot (except webspace between hallux and 2nd digit), sensory webspace between hallux and 2nd digit.
- Motor: Peroneus longus and brevis
-
Tibial nerve (L4-S3):
- Sensory: Sole of foot
- Motor: Biceps femoris (long head), triceps surae, plantaris, popliteus, flexor muscles of foot
-
Superior gluteal nerve (L4-S1):
- Motor: Gluteus medius, gluteus minimus, tensor fascia latae
-
Inferior gluteal nerve (L5-S2):
- Motor: Gluteus maximus
-
Pudendal nerve (S2-S4):
- Sensory: Perineum
- Motor: External urethral and anal sphincters
Lower Extremity Nerve Injuries - Cause & Presentation
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Causes: Abdominal surgery, laparoscopic surgery, tight clothing, obesity, pregnancy, pelvic procedures, pelvic fracture, compression from retroperitoneal hematoma, psoas abscess, herniated disc, posterior hip dislocation, piriformis syndrome, trauma or compression of lateral aspect of leg, fibular neck fracture, knee trauma, Baker cyst, tarsal tunnel syndrome.
- Specific causes may include iatrogenic injury during intramuscular injection.
-
Presentation/Comments (varies per nerve):
- Burning or tingling pain (may radiate); decreased thigh sensation; absent cremasteric reflex; meralgia paresthetica; numbness; tingling; thigh sensation loss; adduction loss; leg extension loss; patellar reflex loss; loss of sensation on dorsum of foot (steppage gait, foot drop); inverted and plantarflexed foot at rest; loss of eversion; loss of dorsiflexion; inability to curl toes; foot everted at rest with weakened inversion and plantar flexion; loss of sensation on sole; Trendelenburg gait (pelvis tilts, difficulty climbing stairs, difficulty rising from seated position, loss of hip extension); sensation loss in perineum and genital area (possible fecal/urinary incontinence).
- Presentation may include lower extremity pain, radiating pain, loss of sensation, weakness in muscles, and specific gait abnormalities.
Important Note
- Specific presentations depend on the affected nerve, location, and specific cause.
- Injuries require accurate diagnosis and treatment.
- Iatrogenic injuries can be prevented by choosing an appropriate injection site.
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Description
Test your knowledge on the key nerves of the lower extremity, including their sensory and motor functions. This quiz covers the Iliohypogastric, Genitofemoral, Lateral femoral cutaneous, Obturator, Femoral, and Sciatic nerves. Enhance your understanding of nervous system anatomy!
