THS: Hip and Leg Muscles

Looking at this muscles: where is its origin?

• pubis of hip

• femur

• tibia

• lumbar

Answer explanation

Remember

Origin is the heavy "non-moveable" bone.

While insertion is the light "moveable" bone.

Looking at this muscles: what is its action?

• extension of hip

• dorsiflexion

• adduction

• abduction

Answer explanation

Correct! The muscle in question is known as the "adductor longus"!!!

O: ilium

I: greater trochanter of femur

A: Abducts and medially rotates the thigh at hip

More vertical alignment

• Gluteus maximus

• Gluteus medius

• Rectus femoris

• Gastrocnemius

Answer explanation

Gluteus medius give away in the description is that is "medially abducts"

O: 2X condyles of the femur

I: calcaneus through the achilles tendon

A: plantarflexion (points the foot), ankle inversion

• Gastrocnemius

• Gluteus maximus

• Sartorius

• Gluteus medius

Answer explanation

The belly of your leg!

O: upper fibula and tibia

I: calcaneus through the achilles tendon

A: plantarflexion (points the foot), ankle inversion

• sartorius

• gastrocnemius

• soleus

• iliopsoas

Answer explanation

*upper "fibula and tibia" tell you it's not the gastrocnemius because it doesn't cross the knee.

O: medial length of the femur

I: patellar ligament

A: Extends the knee

• Vastus Medialis (quad)

• Vastus Lateralis (quad)

• Biceps Femoris (hami)

• Rectus Femoris (quad)

Answer explanation

Hint: "medial length of femur"

O: iliac crest, anterior

I: iliotibial (IT) tract (lateral condlye of tibia)

A: flexes, abducts, and medially rotates thigh

• Gluteus medius

• Rectus femoris (quad)

• Tensor fasciae latae

• Biceps femoris (hami)

Answer explanation

Order at Starbucks:

"Can I get a TFL extra hot with soy milk and hold foam, 1 pump of flexion, 1 pump abduction and 2 pumps of medial rotation."

O: anterior, iliac crest

I: medial tibia

A: Flexes the knee, laterally rotates and flexes the hip

• Soleus

• Sartorius

• Iliopsoas

• Gluteus maximus

Answer explanation

Hint: Origin is way high along the iliac crest and the insertion low along the "medial" tibia.

*remember longest muscle in the body

O: ilium

I: patellar ligament

A: Extends the knee, flexes the hip

• Semitendinosus (hami)

• Vastus Medialis (quad)

• Biceps femoris (hami)

• Rectus Femoris (quad)

Answer explanation

Only quad to flex the hip!!

Notice its the only quad to cross the hip inserting on the ilium.

O: posterior ilium + sacrum

I: femur

A: Extends and laterally rotates the femur at hip

• Tibialis anterior

• Vastus lateralis (quad)

• Gluteus maximus

• Gluteus medius

Answer explanation

Notice the large origin! Ilium and Sacrum!!!! That's some serious "glutes"