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Muscle Origin and Insertion III
Muscle origin and insertion of abductors
17
Anatomy
Graduate
09/13/2009

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Term
Gluteus Minimus
Definition
Smallest muscle of gluteal group
Origin- External surface of ilium between the anterior and inferior gluteal lines
Insertion- Anterior surface of greater trochanter of femur
Innervation- Superior gluteal nerve (L5, S1)
Action- Abducts and medially rotate thigh, keeps pelvis level when opposite leg is raised
Term
Abductor Muscles
Definition
GM, GM, TFL
Gluteus Medius, Gluteus Minimus, Tensor Fascia Latae
Term
Gluteus Medius
Definition
Origin- External surface of ilium between anterior and posterior gluteal lines
Insertion- Lateral surface of greater trochanter of femur
Innervation- Superior Gluteal nerve (L5, S1)
Action- Abducts and medially rotates the thigh, keeps pelvis level when opposite leg is raised
Term
Actions of gluteus medius and minimus while walking.
Step One
Definition
1. When the weight is on both feet, the pelvis is evenly supported and does not sag.
Term
Actions of gluteus medius and minimus while walking.
Step two
Definition
2. When the weight is borne by one foot, the muscles on the same side hold the pelvis so that the pelvis will not sag on the side of the raised limb.
Term
Actions of gluteus medius and minimus while walking.
step three
Definition
3. When the gluteus medius and minimus are inactive owing to injury of the superior gluteal nerve, the supporting and steadying action of these muscles is lost and the pelvis falls on the side of the raised limb. (Trendelenburg's sign)
Term
Tensor Fascia Latae
Definition
Origin- Iliac Crest
Insertion- Iliotibial Tract
Innervation- Superior Gluteal nerve
Action- abducts, medially rotates and flexes thigh. Helps to keep knee extended. Steadies trunk on thigh.
Term
Fascia latae
Definition
A continuous sheet of dense fibrous tissue that surrounds all the muscles of the thigh.
Term
Iliotibial Tract
Definition
A thickening along the outer aspect of the thigh. It extends all the way from the ilium down to the tibia. It acts as the tendon of insertion for two muscles, gluteus maximus and tensor fascia latae.
Term
What two muscles insert into the iliotibial tract?
Definition
gluteus maximus, and the tensor fascia latae.
Term
Where do the gluteus minimus and medius attach?
Definition
greater trochanter
Term
What is the smallest muscle of the abductor group?
Definition
gluteus minimus
Term
What abductor muscle originates from the external surface of the ilium between anterior and posterior gluteal lines?
Definition
gluteus medius and minimus
Term
Which abductor inserts into the anterior portion of greater trochanter?
Definition
gluteus minimus
Term
Which abductor inserts into the lateral surface of the greater trochanter?
Definition
gluteus medius
Term
What abductor originates from the iliac crest?
Definition
tensor fascia latae
Term
What nerve supplies the abductors?
Definition
superior gluteal nerve except for gluteus maximus. it is innervated by the inferior gluteal nerve
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