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 – muscle to bone• Ligament – bone to bone
Tendon of quadriceps
femoris
Patellar Ligament
Palmar Aponuerosis
Aponeurosis – muscle to muscle
Blood Supply – Lower Extremities
Posterior Anterior
Superior & Inferior Gluteal Arteries
Femoral & Obturator
ArteriesDeep Femoral Artery
Popliteal Artery Branches
Nerve Supply – Lower Extremities
Posterior Anterior
Gluteal NervesSuperior = Gluteus med., Gluteus min.& Tensor Fascia LataeInferior = Gluteus Max.
Tibial branch of sciatic nerve
Deep Fibular Nerve
Femoral Nerve
Obturator Nerve
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.
Videos
Tibialis Anterior
Fibularis Longus
Videos
Hip Rotation Muscles
Hip Movement
Gluteus Maximus
Gluteus Medius
Videos
Pectineus
Medial Thigh Muscles
Muscle Origin Insertion Action Nerve Supply Arterial Supply
Hamstrings
Posterior compartme
nt
Biceps Femoris
Ishial Tuberosity
Head of Fibula; lateral tibial
condyle
Extends Thigh; flexes leg
Tibial Branch of Sciatic
NerveDeep Femoral
Artery
SemitendinosusMedial surface of body of the
tibia
Semimembranosus Medial Tibial Condyle
Videos
Biceps Femoris
Semitendinosus
Semimembranosus
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 lateralisGreater
Trochanter and Linea Aspera of
FemurExtends Leg
*Vastus medialis Linea aspera of femur
*Vastus intermedius Anterolateral femoral shaft
Sartorius ASISMedial
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
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