Lower Leg Muscles Flashcards
Muscles of the anterior leg?
Tibialis anterior
Extensor digitorum longus
Extensor hallucis longus
Fibularis tertius
Innervation of the anterior compartment of the leg?
Deep fibular nerve
L4, L5
Attachments of the tibialis anterior?
Lateral condyle and superior lateral surface of tibia and interosseous membrane
Medial cuneiform and base of first metatarsal
Action of the tibialis anterior?
Dorsiflexes ankle
Inverts foot
Attachments of the extensor digitorum longus?
Lateral condyle of tibia and superior three quarters of medial fibula and interosseous membrane
Middle and distal phalanges of lateral 4 digits
Action of the extensor digitorum longus?
Extends lateral four digits
Dorsiflexes ankle
Action of the extensor hallucis longus?
Extends great toe
Dorsiflexes ankle
Attachments of the extensor hallucis longus?
Anterior surface of fibula and interosseous membrane
Dorsal aspect of base of distal phalanx of great toe (hallux)
Attachments of the fibularis tertius?
Inferior third and anterior surface of fibula
Dorsum of base of 5th metatarsal
Action of the fibularis tertius?
Dorsi flexes ankle
Everts foot
Muscles of the lateral compartment of the lower leg?
Fibularis longus
Fibularis brevis
Attachments of the fibularis longus?
Head and superior two thirds of lateral surface of fibula
Base of metatarsal I and medial cuneiform
Action of the fibularis longus?
Everts foot weakly and plantarflexes ankle
Innervation of the lateral compartment of the lower leg?
Superficial fibular nerve
L5, S1, S2
Attachments of the fibularis brevis?
Inferior two thirds of lateral surface of fibula
Tuberosity on lateral side of base of 5th metatarsal
Action of the fibularis brevis?
Everts foot
Weakly plantarflexes ankle
What does injury to the common fibular nerve result in?
Foot drop
What are the posterior leg muscles innervated by?
Tibial nerve
Name the superficial muscles of the posterior compartment of the leg
Gastrocnemius
Soleus
Plantaris
Name the deep muscles of the posterior leg
Popliteus
Flexor hallucis longus
Flexor digitorum longus
Tibialis posterior
Attachments of the gastrocnemius?
Lateral head: Lateral condyle of femur
Medial head: popliteal surface of femur
Posterior surface of calcaneus via calcaneal tendon
Attachment of the soleus muscles?
Posterior aspect of head and surface of fibula and soleal line of tibia
Posterior surface of calcaneus via calcaneal tendon
Action of ten gastrocnemius?
Plantarflexes ankle when knee is extended
Raises heel during walking
Flexes leg at knee joint
Action of the soleus?
Plantarflexes ankle
Steadies leg in foot
Attachments of the plantaris?
Lateral supracondylar line of FEMUR
Posterior surface of calcaneus via calcaneal tendon
Action of ten plantaris?
Weakly assists gastrocnemius in plantarflexing the ankle
Attachments of the popliteus?
Lateral condyle of femur and lateral meniscus
Posterior surface of tibia
Action of the popliteus?
Weakly flexes the knee
Unlocks it by rotating femur by 5*
Medially rotates tibia of unplanted limb
Attachments of the flexor hallucis longus?
Posterior fibula and interosseous membrane
Base of distal phalanx of great toe
Actions of the flexor hallucis longus?
Flexes the great toe
Weakly plantarflexes the ankle
Supports medial longitudinal arch of the foot
Attachments of the flexor digitorum longus?
Posterior tibia to bases of distal phalanges of lateral four digits
Action of the flexor digitorum longus?
Flexes lateral 4 digits
Plantarflexes ankle
Supports longitudinal arch of the foot
Attachments of the tibialis posterior?
Interosseous membrane, posterior tibia and fibula
Tuberosity of navicular, cuneiform, cuboid and calcaneus and bases of 2nd-4th metatarsals
Actions of the tibialis posterior?
Plantarflexes the ankle
Inverts the foot
