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Muscle Origin and Insertion II
Muscle origin and insertion of extensors
12
Anatomy
Graduate
09/13/2009

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Term
Semi-membranosus
Definition
Origin- Ischial Tuberosity
Insertion- Posterior part of medial condyle of tibia
Innervation- Tibial division of sciatic nerve
Action- Extension of thigh, flexion of leg, medially rotate the leg
Term
Semi-tendonosus
Definition
Origin- Ischial tuberosity
Insertion- medial surface of superior part of tibia
Innervation- Tibial division of sciatic nerve
Action- extend the thigh, flex the leg, medially rotate leg
Term
Biceps Femoris (long head)
Definition
Origin- ischial tuberosity
Insertion- Lateral side of head of fibula
Innervation- Tibial Division of Sciatic Nerve
Action- Extend the thigh and flex the leg, laterally rotates the leg
Crosses and provides protection to the sciatic nerve
Term
Biceps Femoris (short head)
Definition
Origin- Linea aspera
Insertion- Lateral side of the head of the fibula
Innervation- Common fibular division of the sciatic
Term
Hamstring Muscles
Definition
Three hamstrings all arise from the ischial tuberosity. All hamstring muscles extend the thigh and flex the leg. All are innervated by the tibial division of the sciatic nerve except for the biceps femoris short head. When knee flexion is held by the action of quadriceps, the hamstrings extend the hip, which is the action that propels forward in normal walking.
Term
Gluteus Maximus
Definition
Thick flat sheet overlying the hamstrings.
Origin- Back of the ilium, dorsal surface of sacrum and sacrotuberous ligament.
Insertion- Iliotibial tract and gluteal tuberosity of femur.
Innervation- Inferior gluteal nerve
Actions- extends thigh and assists lateral rotation
One of two anti-gravity muscles (+ quadriceps)
Term
What joints do the hamstring muscles act on?
Definition
Knee and hip joints
Term
Where do the hamstring muscles originate?
Definition
ischial tuberosity
Term
What muscle originates from the back of the ilium and dorsal surface of sacrum?
Definition
Gluteus maximus
Term
Where does the biceps femoris short head originate from?
Definition
linea aspera
Term
Which muscle inserts into the lateral side of the head of the fibula?
Definition
biceps femoris
Term
Which muscle inserts into the iliotibial tract and gluteus tuberosity of the femur?
Definition
gluteus maximum
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