Ankle Eversion and Muscles Quiz

Which primary muscles are involved in ankle eversion from plantar flexion?

What is the range of motion for ankle eversion from plantar flexion?

What effect does weakness of ankle eversion from plantar flexion have?

What is the origin of the peroneus longus muscle?

What accessory muscle assists in ankle eversion?

What is the action of the peroneus brevis muscle?

Which nerve innervates the peroneus muscles?

What effect does contracture of ankle eversion from plantar flexion have?

Primary ankle everters (plantar flexion)

Ankle eversion range of motion

Peroneus Longus origin

Peroneus Longus insertion

Peroneus Brevis origin

Peroneus Brevis insertion

Accessory ankle everters

Primary Muscles:
- Peroneus longus
- Peroneus brevis
Accessory Muscles:
- Extensor digitorum longus
- Peroneus tertius
Range of Motion (ROM):
- Foot eversion: 15° to 25°
Peroneus Longus Anatomy:
- Origin: Lateral condyle of tibia, head of fibula, upper two-thirds of lateral fibula shaft
- Insertion: Base of first metatarsal, medial cuneiform
Peroneus Longus Action:
- Plantar flexes and everts the foot
- Supports lateral longitudinal and transverse arches
- Innervated by the peroneal nerve
Peroneus Brevis Anatomy:
- Origin: Lower two-thirds of lateral fibular shaft
- Insertion: Base of 5th metatarsal
Peroneus Brevis Action:
- Plantar flexes and everts the foot
- Supports the lateral longitudinal arch
- Innervated by the peroneal nerve
Effects of Weakness:
- Decreases strength of foot eversion and plantar flexion of the ankle joint
- Allows a varus position of the foot
Effects of Contracture:
- Results in an everted or valgus position of the foot
Additional Effects of Weakness:
- Lessens ability to elevate onto the toes
- Decreases lateral foot stability