Sciatic Nerve Anatomy and Function Quiz

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Questions and Answers

Which nerve is the largest in the body?

Pudendal nerve

Femoral nerve

Obturator nerve

Sciatic nerve (correct)

What is the origin of the sciatic nerve?

From the sacral plexus (correct)

From the femoral nerve

From the obturator nerve

From the brachial plexus

Which muscle does the sciatic nerve pass below?

Gluteus maximus muscle

Sartorius muscle

Quadratus femoris muscle

Piriformis muscle (correct)

What is the effect of injury to the sciatic nerve?

Loss of sensation in the leg and foot Signup and view all the answers

Which branch of the sciatic nerve gives rise to the tibial nerve?

Fibular part Signup and view all the answers

What condition is characterized by pain radiating along the path of the sciatic nerve?

Sciatica Signup and view all the answers

Which muscles are supplied by the muscular branches of the sciatic nerve?

Muscles in the posterior compartment of the thigh Signup and view all the answers

What is the sensory effect of sciatic nerve injury below the knee?

Loss of sensation on the medial side of the leg Signup and view all the answers

Where does the tibial nerve originate from?

Sciatic nerve Signup and view all the answers

What causes sciatica?

Pressure on a nerve root Signup and view all the answers

Where does the sciatic nerve terminate?

Middle of back of the thigh Signup and view all the answers

Why are intramuscular injections given only in the upper lateral quadrant of the gluteal region?

To avoid damaging the sciatic nerve Signup and view all the answers

Which nerve supplies the piriformis muscle?

Sciatic nerve Signup and view all the answers

Which muscle is NOT one of the six lateral rotators of the hip joint?

Sartorius Signup and view all the answers

The obturator internus muscle originates from which of the following anatomical structures?

Pelvic surface of the obturator membrane Signup and view all the answers

Which muscle is supplied by the nerve to quadratus femoris?

Quadratus femoris Signup and view all the answers

Which muscle has its insertion on the tip of the greater trochanter?

Obturator internus Signup and view all the answers

The sciatic nerve branches from which part of the sacral plexus?

S1, S2 Signup and view all the answers

Study Notes

### Sciatic Nerve Anatomy & Function

The sciatic nerve is the largest nerve in the body.
It originates from the lumbosacral plexus, specifically from the L4-S3 nerve roots.
It passes below the piriformis muscle in the gluteal region.
The tibial nerve arises from the posterior division of the sciatic nerve.
Injury to the sciatic nerve can lead to weakness, numbness, and pain in the leg and foot.
Sciatica is a condition characterized by pain radiating along the path of the sciatic nerve.

Muscles Supplied by the Sciatic Nerve

The muscular branches of the sciatic nerve supply the hamstring muscles, adductor magnus, and short head of biceps femoris.

### Tibial Nerve

The tibial nerve originates from the posterior division of the sciatic nerve.
It supplies sensory innervation to the sole of the foot.

Sciatica Causes & Effects

Sciatica is commonly caused by compression of the sciatic nerve due to conditions like herniated disc, spinal stenosis, or muscle strain.
Injury to the sciatic nerve below the knee results in sensory loss in the sole of the foot.
The sciatic nerve terminates by dividing into the tibial and common peroneal nerves.

### Gluteal Region Injections

Intramuscular injections in the gluteal region should be given only in the upper lateral quadrant to avoid damaging the sciatic nerve.

Muscles of the Hip

The piriformis muscle is supplied by the nerve to piriformis, which is a branch of the sacral plexus.
Obturator internus muscle is supplied by the nerve to obturator internus.
The quadratus femoris muscle is supplied by the nerve to quadratus femoris.
The piriformis muscle is not one of the six lateral rotators of the hip joint.
The obturator internus muscle originates from the inner surface of the obturator membrane.
The gluteus medius muscle has its insertion on the tip of the greater trochanter.

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Description

Test your knowledge on the anatomy, branches, and effects of injury of the sciatic nerve. Learn about its termination, branches, and the motor effects associated with sciatic nerve injuries.