[Sonography of peripheral nerves. Part II: lower limbs]

On sonographic images, the peripheral nerves have a fibrillary structure, ribboned on longitudinal images and ovoid on cross-section images. The nerves travel between the muscle groups, often with blood vessels, or in canals. Recently improved ultrasound devices are able to investigate the peripheral nerves along their entire length, as far as the sonographer has thorough anatomical knowledge, rigorous technique, and, when searching for pathology, good clinical notions. As in Part I on sonography of the peripheral nerves of the upper limbs, published in this journal, the objective of this general review is to present normal and pathological echoanatomy of the peripheral nerves of the lower limbs in an educational way.