Muscles: Origins, Insertions, Actions, Nerve Supply, & Arterial Supply BY 115/115L

Basic Vocabulary Agonist – performing the action Antagonist – opposite of the agonist/performs opposite action Synergist – assists the agonist Insertion – more distal and lateral/joint where primary movement takes place Origin – more proximal attached end/where muscle “originates”

Tendon of quadriceps femoris Tendon – muscle to bone Ligament – bone to bone Tendon of quadriceps femoris Patellar Ligament

Aponeurosis – muscle to muscle Palmar Aponuerosis

Blood Supply – Lower Extremities Superior & Inferior Gluteal Arteries Femoral & Obturator Arteries Deep Femoral Artery Popliteal Artery Branches Posterior Anterior

Nerve Supply – Lower Extremities Gluteal Nerves Superior = Gluteus med., Gluteus min.& Tensor Fascia Latae Inferior = Gluteus Max. Femoral Nerve Tibial branch of sciatic nerve Obturator Nerve Deep Fibular Nerve Posterior Anterior

Actions A muscle that crosses on the anterior side of a joint produces flexion. A muscle that crosses on the posterior side of a joint produces extension. A muscle that crosses on the lateral side of a joint produces abduction. A muscle that crosses on the medial side of a joint produces adduction.

Tibialis Anterior Fibularis Longus Videos Tibialis Anterior Fibularis Longus

Hip Rotation Muscles Hip Movement Gluteus Maximus Gluteus Medius Videos Hip Rotation Muscles Hip Movement Gluteus Maximus Gluteus Medius

Pectineus Medial Thigh Muscles Videos Pectineus Medial Thigh Muscles

Extends Thigh; flexes leg Tibial Branch of Sciatic Nerve Muscle Origin Insertion Action Nerve Supply Arterial Supply Hamstrings Posterior compartment Biceps Femoris Ishial Tuberosity Head of Fibula; lateral tibial condyle Extends Thigh; flexes leg Tibial Branch of Sciatic Nerve Deep Femoral Artery Semitendinosus Medial surface of body of the tibia Semimembranosus Medial Tibial Condyle

Biceps Femoris Semitendinosus Semimembranosus Videos Biceps Femoris Semitendinosus Semimembranosus

Anterior Compartment Muscle Origin Insertion Action Nerve Supply Arterial Supply Quadriceps Femoris is formed from the first four muscles* Anterior Compartment *Rectus Femoris AIIS Tibial Tuberostity by way of the patella and patellar ligament Flexes Thigh; Extends Leg Femoral Nerve Femoral Artery Branches *Vastus lateralis Greater Trochanter and Linea Aspera of Femur Extends Leg *Vastus medialis Linea aspera of femur *Vastus intermedius Anterolateral femoral shaft Sartorius ASIS Medial surface of body of the tibia flexes leg; abducts and flexes thigh; rotates thigh laterally Tensor fascia latae Iliac Crest and ASIS Tibia by way of the iliotibial tract Stabalizes Torso on thigh when iliotibial tract is taut; flexes abducts thigh; rotates thigh medially superior gluteal nerve

Videos Rectus Femoris Vastus Lateralis Vastus Medialis Vastus Intermedius Sartorius Tensor Fascia Latae