Which myotome pattern is defined by plantarflexion, eversion, and hip extension?

The myotome pattern associated with plantarflexion, eversion, and hip extension corresponds to the first sacral nerve root, also known as S1. This myotome is crucial because it innervates muscles responsible for these specific movements.

Plantarflexion involves the action of pointing the toes downward, primarily facilitated by the gastrocnemius and soleus muscles, which are innervated by the S1 nerve root. Eversion, or the outward turning of the foot, is primarily controlled by the peroneus longus and peroneus brevis, also innervated by S1. Additionally, S1 contributes to hip extension, which is performed by the gluteus maximus, a muscle that relies on this nerve root for motor function.

Understanding the S1 myotome is essential for assessing lower limb function and diagnosing potential neurological deficits, especially in conditions that may affect the sacral spine or root. This knowledge aids healthcare professionals in providing appropriate interventions and understanding patient limitations.