Muscles of the Leg Chart

Thigh  Origin Insertion Action Notes
Posterior thigh See also: Stretches
(Hamstrings) Hamstring Stretches
Biceps Femoris Long head -Ischial tuberosityShort head- lateral lip of linea aspera Head of the fibula Flex knee, extend hip,
tilt pelvis posteriorly,
laterally rotates femur
Semitendinosus Ischial tuberosity Proximal, medial condyle of the tibia Flex knee, extend hip,
tilt pelvis posteriorly,
medially rotate of flexed knee
superficial, stringy, tendonus attachment
Semimembranosus Ischial tuberosity Posterior medial condyle of the tibia Flex knee, extend hip, tilt
pelvis posteriorly, medially rotate flexed knee
 deeper, broader, most medial
Anterior Thigh
Sartorius  Anterior superior iliac spine Upper medial shaft of tibia assists flexion, abduction, lateral rotation of hip, assists flexion, medial rotation of knee cross-legged flexion: the tailors muscle
Quadriceps
Rectus femoris  anterior inferior iliac spine, ilium on upper margin of acetabulum patella, patellar ligament to tibial tuberosity extension of knee, assists flexion of hip only hip flexor of quad group
Vastus medialis  linea aspera on posterior femur patella, patellar ligament to tibial tuberosity extension of knee
Vastus lateralis  linea aspera on posterior femur patella, patellar ligament to tibial tuberosity extension of knee
Vastus intermedius  anterior and lateral femoral shaft patella, patellar ligament to tibial tuberosity extension of knee
 Medial thigh Groin Stretches
Pectineus  superior ramus of pubis pectineal line of femur flexes hip, adducts thigh, medially rotates the thigh
Adductor longus anterior pubis just inferior to pubic tubercle linea aspera on posterior femur adduction of hip, assists in flexion and medial rotation of hip
Adductor brevis  anterior pubis linea aspera on posterior femur adduction of the hip, assists in flexion and medial rotation of hip
Adductor magnus  inferior pubic ramus, ischial ramus,  ischial tuberosity proximal 1/3 of linea aspera of posterior femur, adductor tubercle  adduction of hip, assists in flexion of hip, posterior fiber assists in extension of hip assist hamstrings
Gracilis  anterior pubis medial proximal tibia adduction of hip, assists in flexion and medial rotation of flexed knee crosses knee and hip
 Leg, ankle, foot, posterior thigh
Gastrocnemius  medial epicondyle of femur, lateral epicondyle of femur calcaneus via achilles tendon plantarflexion of  foot at  ankle, flexion of knee crosses knee and ankle
Soleus  upper fibula, soleal line of tibia calcaneus via achilles tendon plantarflexes foot deep to gastrocnemius, but wider than gastroc; strong contractions pump blood from leg to heart
Plantaris  above the lateral head of gastrocnemius on femur calcaneus via achilles tendon weak plantarflexion of the foot at ankle may be absent in approx. 10% of people
Popliteus  lateral femoral condyle posterior tibial surface above soleal line laterally rotates femur, flexes the knee, unlocks knee from and extended position deepest muscle of posterior knee
Tibialis posterior  proximal posterior tibia,
interosseous membrane, medial fibula
navicular, cuneiform, cuboid bones and bases of 2nd -4th metatarsals inverts the foot, plantar flexes the ankle tendons under flexor retinaculum
Flexor digitorum longus  lower 2/3 of tibia 4 outer phalanges plantar surface, along side ankle plantarflexes and inverts foot, flexes toes 2-5
Flexor hallicus longus  inferior 2/3 of posterior fibula plantar surface of big toe  flexes big toe, weak plantarflexion of the ankle, inversion of foot
Anterior leg – Stretches for shin splints
Tibialis anterior  lateral tibia, proximal lateral surface of tibia, interosseous membrane medial cuneiform, first metatarsal  inversion of foot,
dorsiflexion of ankle
Extensor digitorum longus  lateral tibial condyle, fibula dorsal surface of phalanges 2-5 extension of toes 2-5, dorsiflexion of the ankle, eversion of the foot
Extensor hallicus longus  medial aspect of the fibula, interosseous membrane diatal phalanx of big toe extends the big toe,
dorsiflexion of the ankle, inversion of the foot
 Lateral leg
Peroneus longus  upper lateral fibula medial cuneiform, plantar surface of cuboid, base of 1st metatarsal eversion and abduction of foot, weak plantarflexion of foot
Peroneus brevis  lower, lateral 2/3 of fibula  fifth metatarsal eversion and abduction of foot, weak plantarflexion of foot

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