Definition

1. Noun:
   • A muscle of the lower leg: The peroneus is any of several muscles located on the outer side of the lower leg, specifically in the lateral compartment. These muscles are primarily involved in the movements of eversion (turning the sole of the foot outward) and plantar flexion (pointing the toes downward) of the foot.

Usage Examples

• Noun:
  • The peroneus longus helps to stabilize the ankle during walking.
  • An injury to the peroneus can cause pain along the outside of the lower leg.
  • Strengthening the peroneus muscles is important for ankle stability.

Advanced Usage

• Anatomical Context: In detailed anatomical or medical discussions, the term is often specified as one of the three main muscles: peroneus longus, peroneus brevis, and peroneus tertius. These work together to control foot movement.
  • The peroneus brevis lies underneath the peroneus longus.

Variants and Related Words

• Peroneal (adj): Pertaining to the fibula or to the outer side of the leg. Often used to describe associated nerves, arteries, or the general anatomical region.
  • The common peroneal nerve innervates the peroneus muscles.

Synonyms

• Fibularis: This is the modern, internationally recognized anatomical term that is synonymous with "peroneus." The muscles are now officially termed the fibularis longus, brevis, and tertius.
  • The fibularis longus performs the same action as the peroneus longus.

Related Phrases

• Peroneal tendon: The tendons of the peroneus muscles, which run behind the outer ankle bone (lateral malleolus).
  • He suffered a tear in his peroneal tendon.
• Peroneal nerve palsy: A condition involving damage to the peroneal nerve, which can lead to weakness in the peroneus muscles and a condition called "foot drop."
  • The patient presented with foot drop due to peroneal nerve palsy.

Noun

1. muscle of the lower leg that is involved in moving the foot