Muscles of the Thigh Flashcards
What is the inguinal ligament?
Ligament between anterior superior iliac spine and pubis
What is the fascia lata?
Fibrous sheath that encircles all the muscles of the thigh, tightly binding them
What is the iliotibial band?
Thickened lateral portion of the fascia lata, from the iliac crest to lateral proximal tibia
What two muscles compose the iliopsoas?
Iliacus
Psoas major
Where does the iliopsoas run?
Fibers from 2 different areas pass under the inguinal ligament an insert together, via a common tendon, on the lesser trochanter(femur)
What movements does the iliopsoas allow for?
Allows for hip flexion, trunk flexion
Where is the iliacus?
Starts in the iliac fossa; inserts w/ psoas major on lesser trochanter
What shape is the iliacus?
Fan-Shaped
Does the iliacus allows for flexion or extension?
Hip flexion (because it passes over the hip joint)
Where is the psoas major?
From transverse processes of lumbar vertebrae; inserts w/ iliacus on lesser trochanter
Which muscle in the iliopsoas is medial?
Psoas major
What movements does the Psoas major allow for?
Allows for hip flexion, and trunk flexion (trunk because of L vertebrae insertion)
Allows for lateral flexion if just one side contracts
Where is the piriformis?
Sacrum to greater trochanter
What direction are the fibers of the piriformis?
Transverse
The piriformis ________ rotates extended thigh
Laterally
The piriformis _________ the hip joint and _______ the flexed thigh
Stabilizes
Abducts
What is piriformis syndrome?
“Fat wallet syndrome” piriformis compresses and irritates sciatic
Where does the gluteus maximus insert?
Inserts into the iliotibial band (which inserts on proximal tibia)
What movements does the gluteus maximus allow for?
Laterally rotates thigh
Abducts the thigh
The gluteus maximus is a powerful thigh flexor or extensor?
Extensor
What forms the lean muscle of the butt?
Gluteus maximus
What muscle provides most of the lift when climbing stairs?
Gluteus maximus
What does the gluteus medius do?
Abducts the thigh
Medially rotates thigh
Steadies Pelvis
What does the gluteus minimus do?
Abducts the thigh
Medially rotates thigh
Steadies Pelvis
The gluteus minimus is ______ to the gluteus medius.
Deep
Where is the tensor fascia latae?
Goes from anterior, superior iliac spine ( and a little of ant. sup. crest) to iliotibial band
What movements does the tensor fascia latae do?
Flex and abduct thigh
How does the tensor fascia latae steady the knee?
By tightening the iliotibial band
