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Questions and Answers
What is the origin of the sciatic nerve?
What is the origin of the sciatic nerve?
- Spinal nerves T1 to T4
- Spinal nerves L1 to L5
- Spinal nerves S1 to S4
- Spinal nerves L4 to S3 (correct)
What is the typical location where the sciatic nerve divides into the common peroneal and tibial nerves?
What is the typical location where the sciatic nerve divides into the common peroneal and tibial nerves?
- At the apex of the popliteal fossa (correct)
- At the apex of the elbow
- At the apex of the shoulder
- At the apex of the hip
What is the main function of the sciatic nerve?
What is the main function of the sciatic nerve?
- Supplies the anterior thigh muscles
- Supplies the posterior thigh muscles, all leg and foot muscles, and the skin of most of the leg and foot (correct)
- Supplies the skin of the upper limb
- Supplies the gluteal region
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Study Notes
- The sciatic nerve is the largest branch of the sacral plexus.
- It is formed from both anterior and posterior divisions of spinal nerves L4 to S3.
- The sciatic nerve emerges through the greater sciatic foramen inferior to the piriformis.
- It runs under cover of the gluteus maximus.
- At the apex of the popliteal fossa, the nerve typically divides into the common peroneal and tibial nerves.
- The sciatic nerve receives a named branch of the inferior gluteal artery.
- It supplies no structures in the gluteal region.
- It supplies the posterior thigh muscles, all leg and foot muscles, and the skin of most of the leg and foot.
- It also supplies the articular branches to all joints of the lower limb.
- The sciatic nerve is 2cm wide.
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