The Sciatic Nerve

The following course is an interactive teaching module on the sciatic nerve. At the end of this module you should be able to confidently describe the anatomy and function of the sciatic nerve. In addition to this, you should be able to apply this knowledge to multiple choice and problem solving questions.


Introduction to the sciatic nerve

Course introduction

Roots of the sciatic nerve

Overview of the anatomical course of the sciatic nerve

Surface markings of the sciatic nerve

The sciatic nerve is formed by the ventral rami of which spinal nerves?

The sciatic nerve supplies which compartments in the lower limb?

The sciatic nerve divides into which two named nerves?

When performing a sciatic nerve block,  a surface marking for the sciatic nerve can be made between which two bony features? (See figure 4 to aid your answer)


Anatomical relations of the sciatic nerve

Sciatic nerve and the lumbosacral plexus

Sciatic nerve in the gluteal region and pelvis

Sciatic nerve and piriformis

Sciatic nerve in the posterior thigh

Blood supply to the sciatic nerve

What are the names given to nerves A and B in this diagram of the lumbosacral plexus?

The sciatic nerve emerges under the inferior border of which muscle?

The sciatic nerve provides nerve supply to structures of the gluteal region?

The sciatic nerve exits the pelvis through which structure?

The sciatic nerve runs under the cover of which muscle in the posterior thigh?


Function of the sciatic nerve

Muscular supply

Cutaneous supply

Articular branches

Which of the following muscles is NOT supplied by the tibial division of the sciatic nerve?

The sciatic nerve provides sensation to the anterior thigh, true or false?

The only joint of the lower limb supplied by direct articular branches of the sciatic nerve is the hip joint, true or false?


Tibial Nerve



The tibial nerve is formed by which nerve roots?

Which two nerves are the terminal branches of the tibial nerve supplying motor and sensory supply to the foot?

The tibial nerve provides direct motor innervation to...

Tibial nerve fibres contribute to the formation of a nerve which supplies sensation to the posterior and lateral aspect of the leg and lateral aspect of the foot. What is this nerve called?


Common peroneal nerve



From which nerve roots is the common peroneal nerve formed?

The common peroneal nerve bifurcates into which two named nerves?

The superficial peroneal nerve provides motor nerve supply to which compartment (s) of the leg?

Area B in figure 18 receives sensory supply by which named nerve?


Applied knowledge scenario


Patient presentation

Examination of the patient

Your turn...

Loss of sensation over the plantar surface of the foot is most likely to be caused by a problem with which nerves?

The medial and lateral plantar nerves originate from which named nerve?

The tibial nerve is formed by the bifurcation of which named nerve?

From your anatomy knowledge and the information presented, a problem in which anatomical structure would result in pain radiating down the back of the thigh, leg and into the foot accompanied with loss of sensation?