PHTY100 Lecture Notes - Lecture 5: Quadriceps Femoris Muscle, Palpation, Anterior Inferior Iliac Spine
Muscles of the Thigh
5.1 Identify, describe the attachments of and deduce the actions of the muscles of the thigh:
•Anterior
•sartorious
•PA: anterior superior iliac spine (ASIS)
•DA: medial surface of the upper part of the shaft of the tibia, medial collateral ligament of the
knee
•A: flexes thigh at hip, laterally rotates thigh, flexes leg at knee
•rectus femoris
•PA: anterior inferior iliac spine (AIIS), ilium just superior to the acetabulum
•DA: tibial tuberosity via the patellar ligament
•A: extends leg at knee, flexes thigh at hip
•vastus lateralis
•PA: upper lateral part of the intertrochanteric line, lower border of the greater trochanter,
lateral side of the gluteal tuberosity, upper half of the lateral lip of the linea aspera
•DA: tibial tuberosity via the tendon of rectus femoris and the patellar ligament, blends with the
iliotibial tract
•A: Extends leg at knee, stabilises knee
•vastus medialis
•PA: lower medial part of the intertrochanteric line, medial aspect of the proximal femoral
shaft, medial lip of the linea aspera, upper two thirds of the medial supracondylar line
•DA: tibial tuberosity via the tendon of rectus femoris and the patellar ligament, medial condyle
of the tibia
•A: extends leg at knee, stabilises patella
•vastus intermedius
•PA: upper two thirds of the anterior and lateral surfaces of the femur
•DA: tibial tuberosity via the tendon of rectus femoris and the patellar ligament
•A: extends leg at knee
•Posterior group (hamstrings)
•biceps femoris (long head and short head)
•PA: medial part of the ischial tuberosity and sacrotuberous ligament (long head), lower half
lateral lip of the linea aspera extending to the upper part of the lateral supracondylar line of
the femur (short head)
•DA: head of the fibula
•A: extends thigh at hip, flexes leg at knee, laterally rotates leg
•Semitendinosus
•PA: medial aspect of the ischial tuberosity
•DA: medial surface of the upper part of the shaft of the tibia
•A: extends thigh at hip, flexes leg at knee, medially rotates leg
•Semimembranosus
•PA: lateral aspect of the ischial tuberosity
•DA: posteromedial surface of the medial tibial condyle
•A: extends thigh at hip, flexes leg at knee, medially rotates leg
•Medial group
•Gracilis
•PA: anterior body of the pubis, inferior ramus of the pubis
•DA: medial surface of the upper part of the shaft of the tibia
•A: adducts thigh, flexes leg at knee, medially rotates leg
•Pectineus
•PA: superior ramus of the pubis
•DA: pectineal line of the femur
•A: adducts thigh, flexes thigh at hip, medially rotates thigh
•adductor magnus
•PA: ischiopubic ramus extending to the inferior part of the ischial tuberosity
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