Summary
Summary of muscles of the lower limb
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Complete summary (with images) of the muscles of the lower limb, including their origin, insertion, action and innervation.
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Iliopsoas Action: Flexion of hip. Anterior pelvic tilt (iliacus)Origin: Psoas – bodies and transverse processes T12 –
L5 and intervertebral discs. Iliacus – iliac fossa
Insertion: Lesser trochanter
Innervation: Psoas – L1, L2, L3. Iliacus – femoral nerve
(L2, L3, L4)
Sartorius Action: Flexion, adduction and external rotation of
thigh, knee flexion
Origin: Anterior superior iliac spine (ASIS)
Insertion: Medial tibia inferior and medial to tibial
tuberosity
Innervation: Femoral nerve
Rectus Femoris Action: Flexion of hip, extension of knee (kicking)
Origin: Straight head – inferior iliac spine. Reflected
head – superior to acetabulum
Insertion: Patella
Innervation: Femoral nerve
Vastus Lateralis Action: Knee extension
Origin: Lateral intertrochanteric line, greater
trochanter, gluteal tuberosity, linea aspera
Insertion: Patella
Innervation: Femoral nerve
, Vastus Medialis Oblique Action: Knee extension
Origin: Medial intertrochanteric line, linea aspera,
medial supracondylar line
Insertion: Patella
Innervation: Femoral nerve
Vastus Intermedius Action: Knee extension
Origin: Upper anterior and lateral femur
Insertion: Patella
Innervation: Femoral nerve
Tensor Action: Hip abduction
Fascia Lata Origin: Anterior iliac crest, ASIS, deep surface of fascia
lata
Insertion: ITB junction of upper and middle thirds
Innervation: Gluteal nerve (L5/S1)
Gracilis Action: Adducts, medially (internally) rotates thigh, and
flexes the knee
Origin: Body of pubis, ischiopubic (inferior) ramus
Insertion: Medial proximal shaft of tibia
Innervation: Obturator nerve (L2, L3, L4)
Pectineus Action: Adducts, medially rotates, and flexes the thigh
Origin: Superior ramus of pubis (pectineal line)
Insertion: Femur (pectineal line)
Innervation: Obturator / Femoral nerve
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