Lower Leg Musculature Flashcards
Anterior Tibialis
Origin - Lateral condyle and proximal 2/3 of the lateral surface of the tibia.
Insertion - Medial and plantar aspects of the medial cuneiform and the base of the first metatarsal
Isolated Function - Concentrically accelerates Xdorsiflexion and inversion
Integrated Function -
- Eccentrically decelerates plantarflexion and eversion
- Isometrically stabilizes the arch of the foot
Posterior Tibialis
Origin - Proximal 2/3 of the posterior surface of the tibia and fibula
Insertion - Every tarsal bone [naviular, cuneiform, cuboid] but the talus plus the bases of the second through fourth metatarsal bones. The main insertion is on the navicular tuberosity and the medial cuneiform bone.
Isolated Function - Concentrically accelerates plantarflexion and inversion of the foot
Integrated Function -
- Eccentrically decelerates the dorsiflexion and eversion of the foot
- Isometrically stabilizes the arch of the foot
Soleus
Origin - Posterior surface of the fibular head and proximal 1/3 of its shaft and from the posterior side of the tibia
Insertion - Calcaneus via the Achilles tendon
Isolated Function - COncentrically accelerates plantarflexion
Integrated Function -
- Decelerates ankle dorsiflexion
- Isometrically stabilizes the foot and ankle complex
Gastrocnemius
Origin - Posterior aspect of the lateral and medial femoral condyles
Insertion - Calcaneus via the Achilles tendon
Isolated Function - Concentrically accelerates plantarflexion
Integrated Function -
- Decelerates ankle dorsiflexion
- Isometrically stabilizes the foot and ankle complex
Peroneus Longus
Origin - Lateral condyle of the tibia, head, and proximal 2/3 of the lateral surface of the fibula
Insertion - Lateral surface of the medial cuneiform and lateral side of the base of the first metatarsal
Isolated Function - Concentrically plantarflexes and everts the foot
Integrated Function -
- Decelerates ankle dorsiflexion
- Isometrically stabilizes the foot and ankle complex
