Leg Muscles Flashcards
ANTERIOR TIBIALIS
ORIGIN
Lateral condyle and proximal two-thirds 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
Concentric Action
Ankle dorsiflexion and inversion
INTEGRATED FUNCTION
Eccentric Action
Ankle plantar flexion and eversion
Isometric Action
Stabilizes the arch of the foot1
INNERVATION
Deep fibular (peroneal) nerve
POSTERIOR TIBIALIS
ORIGIN
Proximal two-thirds of posterior surface of the tibia and fibula
INSERTION
Every tarsal bone (navicular, cuneiform, and cuboid) but the talus plus the bases of the second through the fourth metatarsal bones—the main insertion is on the navicular tuberosity and the medial cuneiform bone.
ISOLATED FUNCTION
Concentric Action
Ankle plantar flexion and inversion of the foot
INTEGRATED FUNCTION
Eccentric Action
Ankle dorsiflexion and eversion
Isometric Action
Stabilizes the arch of the foot
INNERVATION
Tibial nerve
SOLEUS
ORIGIN
Posterior surface of the fibular head and proximal one-third of its shaft and from the posterior side of the tibia
INSERTION
Calcaneus via the Achilles tendon
ISOLATED FUNCTION
Concentric Action
Accelerates plantar flexion
INTEGRATED FUNCTION
Eccentric Action
Decelerates ankle dorsiflexion
Isometric Action
Stabilizes the foot and ankle complex
INNERVATION
Tibial nerve
GASTROCNEMIUS
ORIGIN
Posterior aspect of the lateral and medial femoral condyles
INSERTION
Calcaneus via the Achilles tendon
ISOLATED FUNCTION
Concentric Action
Accelerates plantar flexion
INTEGRATED FUNCTION
Eccentric Action
Decelerates ankle dorsiflexion
Isometric Action
Isometrically stabilizes the foot and ankle complex
INNERVATION
Tibial nerve
FIBULARIS (PERONEUS) LONGUS
ORIGIN
Lateral condyle of tibia, head and proximal two-thirds 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
Concentric Action
Plantar flexes and everts the foot
INTEGRATED FUNCTION
Eccentric Action
Decelerates ankle dorsiflexion and inversion
Isometric Action
Stabilizes the foot and ankle complex
INNERVATION
Superficial fibular (peroneal) nerve
BICEPS FEMORIS, LONG HEAD
ORIGIN
Ischial tuberosity of the pelvis, part of the sacrotuberous ligament
INSERTION
Head of the fibula
ISOLATED FUNCTION
Concentric Action
Accelerates knee flexion, hip extension, and tibial external rotation
INTEGRATED FUNCTION
Eccentric Action
Decelerates knee extension, hip flexion, and tibial internal rotation
Isometric Action
Stabilizes the lumbo-pelvic-hip complex and knee
INNERVATION
Tibial nerve
BICEPS FEMORIS, SHORTHEAD
ORIGIN
Lower one-third of the posterior aspect of the femur
INSERTION
Head of the fibula
ISOLATED FUNCTION
Concentric Action
Accelerates knee flexion and tibial external rotation
INTEGRATED FUNCTION
Eccentric Action
Decelerates knee extension and tibial internal rotation
Isometric Action
Stabilizes the knee
INNERVATION
Common fibular (peroneal) nerve
SEMIMEMBRANOSUS
ORIGIN
Ischial tuberosity of the pelvis
INSERTION
Posterior aspect of the medial tibial condyle of the tibia
ISOLATED FUNCTION
Concentric Action
Accelerates knee flexion, hip extension, and tibial internal rotation
INTEGRATED FUNCTION
Eccentric Action
Decelerates knee extension, hip flexion, and tibial external rotation
Isometric Action
Stabilizes the lumbo-pelvic-hip complex and knee
INNERVATION
Tibial nerve
SEMITENDINOSUS
ORIGIN
Ischial tuberosity of the pelvis and part of the sacrotuberous ligament
INSERTION
Proximal aspect of the medial tibial condyle of the tibia (pes anserine)
ISOLATED FUNCTION
Concentric Action
Accelerates knee flexion, hip extension, and tibial internal rotation
INTEGRATED FUNCTION
Eccentric Action
Decelerates knee extension, hip flexion, and tibial external rotation
Isometric Action
Stabilizes the lumbo-pelvic-hip complex and knee
INNERVATION
Tibial nerve
VASTUS LATERALIS
ORIGIN
Anterior and inferior border of the greater trochanter, lateral region of the gluteal tuberosity, and lateral lip of the linea aspera of the femur
INSERTION
Base of patella and tibial tuberosity of the tibia
ISOLATED FUNCTION
Concentric Action
Accelerates knee extension
INTEGRATED FUNCTION
Eccentric Action
Decelerates knee flexion
Isometric Action
Stabilizes the knee
INNERVATION
Femoral nerve
VASTUS MEDIALIS
ORIGIN
Lower region of intertrochanteric line, medial lip of linea aspera, and proximal medial supracondylar line of the femur
INSERTION
Base of patella and tibial tuberosity of the tibia
ISOLATED FUNCTION
Concentric Action
Accelerates knee extension
INTEGRATED FUNCTION
Eccentric Action
Decelerates knee flexion
Isometric Action
Stabilizes the knee
INNERVATION
Femoral nerve
VASTUS INTERMEDIUS
ORIGIN
Anterior-lateral regions of the upper two-thirds of the femur
INSERTION
Base of patella and tibial tuberosity of the tibia
ISOLATED FUNCTION
Concentric Action
Accelerates knee extension
INTEGRATED FUNCTION
Eccentric Action
Decelerates knee flexion
Isometric Action
Stabilizes the knee
INNERVATION
Femoral nerve
RECTUS FEMORIS
ORIGIN
Anterior-inferior iliac spine of the pelvis
INSERTION
Base of patella and tibial tuberosity of the tibia
ISOLATED FUNCTION
Concentric Action
Accelerates knee extension and hip flexion
INTEGRATED FUNCTION
Eccentric Action
Decelerates knee flexion and hip extension
Isometric Action
Stabilizes the lumbo-pelvic-hip complex and knee
INNERVATION
Femoral nerve
