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Questions and Answers
Which spinal nerves contribute to the formation of the lumbar plexus?
Which spinal nerves contribute to the formation of the lumbar plexus?
- C1, C2, C3, and C4
- T1, T2, T3, and T4
- L3, L4, L5, and S1
- L1, L2, L3, and most of L4 (correct)
Where does the lumbar plexus originate?
Where does the lumbar plexus originate?
- In the lumbar vertebrae
- In the posterior abdominal wall, inside the substance of the psoas major muscle (correct)
- In the substance of the transverse processes of the lumbar vertebrae
- In the anterior abdominal wall, inside the rectus abdominis muscle
Which nerve is not a branch of the lumbar plexus?
Which nerve is not a branch of the lumbar plexus?
- Sciatic nerve (correct)
- Genitofemoral nerve
- Femoral nerve
- Obturator nerve
Which nerve innervates the lateral cutaneous area of the thigh?
Which nerve innervates the lateral cutaneous area of the thigh?
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Which spinal nerves contribute to the formation of the sacral plexus?
Which spinal nerves contribute to the formation of the sacral plexus?
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Study Notes
Lumbar Plexus
- The lumbar plexus is formed by the ventral branches of spinal nerves L1-L4.
- The lumbar plexus originates in the lumbar region of the spinal cord.
- The obturator nerve is a branch of the lumbar plexus.
- The lateral cutaneous nerve of the thigh, which is a branch of the lumbar plexus, innervates the lateral cutaneous area of the thigh.
- The iliohypogastric nerve and the ilioinguinal nerve are also branches of the lumbar plexus.
Sacral Plexus
- The sacral plexus is formed by the ventral branches of spinal nerves L4-S3.
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