Module 4D: Lower Appendicular Muscles Flashcards
what area of the body is your thigh?
hip to knee
what are of the body is your leg?
knee to ankle
what is the origin of the psoas major?
- the transverse processes
- bodies of lumbar vertebrae
what is the insertion of the psoas major?
lesser trochanter of femur
what are the actions of the psoas major?
- hip (thigh) flexion (both lifting and flexing the thigh of one or both sides)
- trunk flexion (contracting left and right together)
- lateral flexion of vertebral column (flexing one side)
which joint does the psoas major act directly on?
the hip joint
where is psoas major located in relation to quadratus lumborum?
deep
which muscle does the psoas major combine with as it runs under the inguinal ligament to insert on the femur?
iliacus
where does the inguinal ligament run from?
the anterior superior iliac spine to the pubic tubercle
- it is a major landmark for muscles, nerves, blood vessels and compartments
what is the action of the psoas major dependent on?
which of the bones or segments is kept stable
what is the origin of the iliacus?
iliac fossa
what is the insertion of the iliacus?
lesser trochanter of femur
what is the action of the iliacus?
hip (thigh) flexion
the iliacus is a ______ hip flexor.
powerful
when psoas major and iliacus are combined together, what are the called?
iliopsoas muscle
what is the most powerful flexors of the thigh?
psoas major and iliacus
the insertion on the lesser trochanter of the femur of the psoas major and the iliacus is _____ to the muscles of the thigh.
deep
which muscles are critically important for walking, running, standing?
the psoas major and iliacus
- through movement of the thigh with respect to the trunk and vice versa
what is the origin of the tensor fascia latae?
- crest of ilium (lateral aspect)
what is the insertion of the tensor fascia latae?
iliotibial band (to knee)
what is the actions of the tensor fascia latae?
- hip abduction
- medial rotation of hip
- provides support to knee
what does our tensor fascia latae do when we contract?
it pulls on the IT band and the fascia lata which helps stabilize the knee and hold the muscles and the thigh in place
damage to the tensor fascia latae can cause?
pain at the hip or knee or both
- very common in runners due to the constant stabilization of each leg with each footfall
what is fascia lata?
thick layer of deep fascia in thigh and gluteal region
is the fascia lata a muscle?
no
true or false: the outer layer of the deep fascia of the lower limb forms a stocking-like membrane covering the limb, beneath the superficial fascia layer. the fascia becomes particularly thick in the thigh and gluteal region where the fibers of the fascia are most circular, its called fascia lata.
true
what is the iliotibial band/tract?
- thickening of fascia lata on lateral thigh for tract/band where the fibers align vertically
- vertical fibers extend inferiorly on the lateral side of the thigh to form the IT band
- muscles insert into tract
- on the lateral side of the leg
what are the three gluteal muscles?
- gluteus maximus (largest)
- gluteus medius
- gluteus minimus (smallest)
what is the shape of the gluteus maximus?
quadrilateral
what is the origin of the gluteus maximus?
- sacrum (pretty much covers the full sacrum)
- gluteal surface of ilium
what is the origin of the gluteus medius and minimus?
- gluteal surface of ilium
what is the insertion of the gluteus maximus?
- gluteal tuberosity of femur (1/4)
- iliotibial band (3/4)
what is the insertion of the gluteus medius and minimus?
- greater trochanter of femur
what is the actions of the gluteus maximus?
- extension
- lateral rotation of thigh
important in stabilizing hips during walking/running
what is the actions of the gluteus medius and minimus?
- **abduction (because they are mostly over the top of the hip)
- medial rotation of thigh
important in stabilizing hips during walking/running
where is gluteus minimus with respect to gluteus medius?
gluteus minimus is directly deep of gluteus medius
which muscle is more medial, gluteus maximus or gluteus medius?
gluteus maximus is more superficial and more medial
what are the insertions of the gluteal muscles on the femur in order of superior to inferior
- gluteus minimus
- gluteus medius
- gluteus maximus
- each attach to the femur at slightly different angles so they will have different actions
why do the gluteus medius and minimus abduct and medially rotate the thigh over the stance limb?
to reduce pelvic drop over opposite swing limb during walking
- can be associated with increased risk of low back pain
what is the trendelenburg test?
- a clinical test for the gluteus medius and minimus
- a positive test is the pelvis drops on opposite side than the one being tested
- then indicative that the gluteal nerve is damaged or the gluteus medius or minimus has atrophy or weakness
improper control of the gluteus medius muscle bilaterally has been linked with?
an increased risk of low back pain
what is a good exercise for the gluteus medius and minimus?
clamshell exercises
what are the five muscles of the anterior thigh?
- sartorius
- quadriceps femoris group
- rectus femoris
- vastus medialis
- vastus intermedius
- vastus lateralis
which muscle of our anterior thigh is a
bi-articular or “strap” muscle?
the sartorius
- it crosses two joints (hip and knee)
what is the origin of the sartorius?
- anterior superior iliac spine
what is the insertion of the sartorius?
- medial side of tibia
what is the action of the sartorius?
- flexion
- lateral rotation of thigh
- knee flexion
what muscles insert at the inferior and medial tibial tuberosity?
- sartorius
- gracilis
- semitendinosus
why is the sartorius called the leg crossing muscle?
if you cross one leg over the other by putting your ankle on the opposite knee, you are doing all the motions/actions of the sartorius muscle
- you have flex and laterally rotate the thigh and you have to flex the knee
why is it called the quadriceps femoris group?
there is four muscles
what is the origin of the of the rectus femoris?
anterior inferior iliac spine (crosses the hip joint)
- bipinate fiber orientation so it looks like a feather
what is the origin of the vastus medialis?
medial aspect of femur
what is the origin of the vastus lateralis?
lateral aspect of femur
what is the origin of the vastus intermedius?
anterior surface of femur
- tucked directly under rectus femoris
where does the rectus femoris sit?
anteriorly and in the middle of the other quadriceps femoris muscles
what is the insertion of ALL the quadriceps muscles?
the patella
- they continue to the leg via the patellar ligament running from the patella to the tibial tuberosity
what is the action of the rectus femoris?
- knee extension
- hip flexion (because it crosses your hip joint)
what is the action of the vastus lateralis, medialis and intermedius?
knee extension
what is being achieved by all the quadriceps muscles inserting at the patella?
a lot more force can be generated
- through the attachment to the patella it has extra leverage, giving the ability to generate greater moments simply because of that greater distance away from that joint center
what is leg extension?
knee extension
what is thigh flexion?
hip flexion
in order to target the rectus femoris, what type of movements should the exercise require?
exercises/activities that require both knee extension and hip flexion
what is the medial thigh group?
group of muscles that hold in or bring the limb inward
what does magnus mean?
big
what are the muscles of the medial thigh?
- adductor magnus
- adductor longus
- adductor brevis
- pectineus
- gracilis
what is the origin of the gracilis?
pubis