The peroneus muscles are consist of three
muscles and it also called fibularis. Peroneus is derived from the Greek word
for fibula, indicating the location of the peroneal muscles.
1.
Peroneus Tertius
(fibularis Tertius)
2.
Peroneus brevis (
fibularis brevis)
3.
Peroneus longus
(fibularis longus)
1.
Peroneus Tertius
(fibularis Tertius)
Origin – anterior distal fibula(with extensor digitorum longus)
Insertion – the base of 5th metatarsal
Nerve supply – deep peroneal nerve(l4,5,s1)
Action – eversion of the foot, assist dorsiflexion
Palpation – tendon palpated lateral to extensor digitorum longus tendon on dorsum of foot at base of 5th metatarsal.
This muscle functions to place the foot flat on the ground by raising the lateral border.
2.
Peroneus brevis
(fibularis brevis)
Origin – lateral shaft of the fibula (lower 2/3)
Insertion – the base of 5th metatarsal
Nerve supply- superficial peroneal nerve (l4,5,s1)
Blood supply –
Action – eversion of the foot, assist plantar flexion of the ankle
Palpation- tendon palpated on the lateral dorsum of the foot where it inserts on the tuberosity at the proximal end of 5th metatarsal. It is closest to the malleolus and stands out more than the peroneus longus tendon
The action of the foot
evertors is especially helpful when
walking or running on an uneven surface. Sometimes the muscles “give out and a the sprained ligament can result.
3.
Peroneus longus
(fibularis longus)
Origin – head and lateral shaft of the fibula (upper 2/3)
Insertion - the base of 1st metatarsal and 1st cuneiform
Nerve supply – superficial peroneal nerve (l4,5,s1)
Action – eversion of the foot, assist plantar flexion of the ankle
Palpation – lateral surface of proximal half od lower leg tendon palpated just above and behind lateral malleolus, slightly posterior to peroneus brevis tendon.
Peroneus longus traverses
the sole of the foot to meet the tibialis anterior tendon tp form a stirrup for
the foot.
