Final answer:
The fibularis longus and fibularis brevis muscles are powerful evertors and plantar flexors of the foot but are not significant dorsiflexors. The assertion that these muscles are weak dorsiflexors is indeed true.
Step-by-step explanation:
The fibular muscles, which include the fibularis longus (also known as peroneus longus) and the fibularis brevis (also known as peroneus brevis), primarily play the role of plantar flexing and everting the foot, which means they help in pointing the toes away from the shin and turning the sole of the foot outward. These muscles reside within the lateral compartment of the leg. The fibularis longus and fibularis brevis are not notably involved in dorsiflexion, where the toes are brought closer to the shin. The muscles responsible for dorsiflexion are found in the anterior compartment of the leg, such as the tibialis anterior, extensor hallucis longus, and extensor digitorum longus. Given this information, it is clear that the fibularis muscles are not significant dorsiflexors of the foot.
SUMUP of Final Answer
- The fibularis longus and fibularis brevis muscles are powerful foot evertors and plantar flexors.
- These muscles are not strong dorsiflexors; dorsiflexion is primarily achieved by muscles in the anterior compartment of the leg.
- Therefore, the statement that the fibula's muscles are very powerful evertors of the foot and weak dorsiflexors is true.