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Fibularis tertius is a muscle of the anterior calf whose function is to dorsiflex the foot. Learn everything about its anatomy and function at Kenhub!
In human anatomy, the fibularis tertius (also known as the peroneus tertius) is a muscle in the anterior compartment of the leg. It acts to tilt the sole of the foot away from the midline of the body and to pull the foot upward toward the body (dorsiflexion).
The Peroneus Tertius muscle, also called Fibularis Tertius, is one of the 3 fibularis muscles (fibularis longus, Fibularis Brevis). It is the most superficial muscle in the anterior compartment of leg.
The fibularis tertius is a muscle in the anterior compartment of the leg. It is an extension of the distal part of the extensor digitorum longus muscle and is not always present. Attachments: Originates with the extensor digitorum longus from the medial surface of the fibula.
Quick Facts. Origin: Medial surface of fibula and adjacent interosseous membrane of leg. Insertion: Dorsal aspect of base and body of fifth metatarsal bone. Action: Dorsiflexes foot at ankle joint; assists in eversion of foot at subtalar and transverse tarsal joints. Innervation: Deep fibular nerve (L5-S1).
The Fibularis Tertius muscle, with its unique origin, insertion, muscle path, and function, plays a crucial role in the intricate system of muscles responsible for lower leg and foot movements. Its actions are essential for maintaining balance, stability, and efficient locomotion.
Fibularis (Peroneus) Teritius Muscle (Insertion, Origin, Actions & Innervations); explained beautifully in an illustrated and interactive way. Click and start learning now!
Its origin is with the extensor digitorum longus from the medial surface of the fibula. The tendon of this muscle descends onto the dorsal surface of the foot and attaches to the fifth metatarsal. Its actions are eversion and dorsiflexion of the foot.
The peroneus tertius (fibularis tertius) is one of the muscles within the anterior compartment of the leg. Collectively, the muscles of the anterior compartment act to extend the toes, dorsiflex the ankle and invert the foot. The leg is comprised of anterior, lateral and posterior compartments. The anterior compartment consists of four muscles:
Insertion: Dorsal surface of metatarsal 5. Artery: Anterior tibial artery. Nerve: Deep fibular nerve. Action: Dorsi flexes and everts foot. Description: The Peronaeus tertius is a part of the Extensor digitorum longus, and might be described as its fifth tendon.