Anterior and Medial Thigh Muscles Flashcards
Remember! The gluteal region and muscles on the anterior side of pelvis attach what to what?
Lower extremity to the pelvic girdle
Components of the lower extremity
Thigh, Leg, Foot
Component of LE from hip to the knee
Thigh
Component of LE from knee to ankle
Leg
Component of LE distal to the ankle
Foot
In embryological development of the limb buds of the upper and lower extremities, the limb buds grow with which side facing up and which side facing down?
Dorsal side facing up
Ventral side facing down
What happens to the upper limbs?
They rotate 90 degrees,
Upper limbs rotate 90 degrees laterally
Lower limbs rotate 90 degrees medially
What effect does the location of elbow and knee facing posteriorly and anteriorly affect upper and lower limbs?
Anterior side of leg are extensors
Anterior side of thigh extend the knee
Name the two muscles that originate on the pelvis and cross the hip joint
Iliopsoas
Sartorius
The muscle composed of the iliacus and the psoas major
Iliopsoas
Primary action of the iliopsoas
Flexor of the thigh or trunk
Origin and insertion of iliopsoas
Origin: Iliac fossa, Tranverse processes and bodies of T12 and Lumbar vertebrae
Insertion: Lesser trochanter
Another important action of the iliopsoas
Bending trunk anteriorly or laterally with both feet on ground
Postural muscle too
The iliopsoas passes deep to the
inguinal ligament
innervation of the iliopsoas
Femoral nerve
Originates
Tranverse processes and bodies of T12 and Lumbar vertabrae
Insertion: Lesser trochaneter of femur
Innervation of psoas minor
Ventral rami of L1, L2, and L3.
Action of psoas minor
Flex the thigh and the trunk
Psoas minor is absent on 40% of the population, and can be absent on one side
Cool!
Origin and insertion of the sartorius
Origin: Anterior superior iliac spine
Insertion: Upper medial tibia to form pes anserinus
What is the longest muscle of the body? It crosses two joints
Sartorius
Actions of the sartorius
Flex hip and leg flex the knee
Abduct rotate the thigh laterally
What motion is produced by all of the actions of sartorius combined?
Crossed-leg
Innervation of the sartorius
Femoral Nerve
Name the 3 compartments of the thigh
Anterior
Medial
Posterior
Each compartment of the thigh is separated by fascial walls formed by the deep fascia of the thigh, deemed
Fascia Lata
Muscles of the anterior compartment of the thigh
Rectus Femoris Vastus Lateralis Vastus Medialis Vastus Intermedius Tensor Fascia Latae Articularis Genu
Actions of the anterior thigh muscles
Flex hip and extend the leg
4 muscles of the quadriceps
Rectus Femoris
Vastus Lateralis
Vastus Medialis
Vastus Intermedius
Where do they unite and form?
Quadriceps Tendon
What does the quadriceps contain?
Patella
The ligament from patella to tibial tuberosity is…
Patellar ligament
All muscles of the quadriceps are innervated by
femoral nerve
The kicking muscle that extends the leg and crosses the hip joint so it can flex the thigh
Rectus Femoris
Origin and insertion of the rectus femoris
Origin: Anterior Superior Iliac Spine and rim of acetabulum
Insertion: Tibial tuberosity via patellar ligament
Action
Extend knee and flex the thigh
Group of muscles that cover the anterior surface of the femur
Vastus muscles
Largest component of the quads that is on the lateral side of the thigh
Vastus Lateralis
Origin and insertion of vastus lateralis
Greater Trochanter, Intertrochanteric line, linea aspera
Insertion: Tibial tuberosity via patellar ligament
Action of the vastus lateralis
Extend the leg
Muscle that covers the medial surface of the femur and forms a tear drop bulge just above the knee when leg is extended
Vastus medialis
Origin and insertion of the vastus medialis
Origin: Intertrochanteric line and medial lip of linea aspera
Insertion: Tibial tuberosity via patellar ligament
Action of the vastus medialis
Extends the knee
Muscle that lies deep to rectus femoris , looks very tendonous and not muscular
Vastus Intermedius
Small muscle that lies deep to vastus intermedius is small muscle above knee and pulls the synovial membrane out of knee joint on extension
Articularis Genu
Origin and insertion of vastus intermedius
Origin: Anterior and lateral surfaces of femur
Insertion: Tibial tuberosity via patellar ligament
Action of the vastus intermedius
Extend the knee
Again, the anterior compartment innervated by the..
Femoral nerve
Most important action of anterior compartment is
extend the leg
Muscle on lateral side of the hip and upper thigh
Tensor Fascia Latae
Runners often have inflammation and tenderness in the…called runner’s knee.
Iliotibial band/tract
Main action of tensor fascia latae
Flexor of the thigh with iliopsoas
Medially rotates abducted thigh
Supports femur on the tibia when standing
Origin and insertion of tensor fascia latae
Origin: Anterior aspect of iliac crest, anterior superior iliac spine
Insertion: via IT band into lateral condyle of the tibia (Gerdy’s Tubercle)
Innervation of the tensor fascia latae
Superior Gluteal Nerve
Name the 5 muscles in the medial compartment of the thigh
Adductor Magnus Adductor Longus Adductor Brevis Pectineus Gracilis
Name the primary action of the medial compartment
Adduction of the thigh
What other purpose to the muscles in the medial compartment of the thigh serve?
Stabilize thigh during flexion/extension
What is the innervation of the muscles in the medial compartment of the thigh
Obturator nerve
This is the largest adductor muscle and most deeply placed.
Adductor magnus
Innervation of the adductor magnus (2 of them)
Obturator nerve and tibial nerve
Origin and insertion of the adductor magnus (oblique and triangular portion)
Origin: Ischial ramus and inferior pubic ramus
Insertion: Linea aspera
Origin and insertion of vertical and medial fibers of adductor magnus
Origin: Ischial tuberosity
Insertion: Adductor tubercle
Which nerve innervates oblique portion of adductor magnus
What about the vertically placed fibers
Obturator nerve
Tibial nerve
The action of the oblique portion of adductor magnus
The action of the vertical portion of adductor magnus
Adduction and stabilizing thigh during flexion and extension
Extending the thigh
Most anteriorly placed muscle in adductor group
Adductor longus
Origin and insertion of adductor longus
Origin: Pubis close to pubic symphysis
Insertion: Linea aspera of femur
Innervation of adductor longus
Obturator nerve
Action of adductor longus (3)
Adduct the thigh, flex the thigh, and stabilize thigh during gait.
Muscle that lies deep to adductor longus, thinner and smaller than adductor longus
Adductor brevis
Origin and insertion of the adductor brevis
Origin: Body and inferior ramus of the pubis
Insertion: Linea aspera
Innervation of the adductor brevis
Obturator Nerve
Action
Adduct thigh, flex thigh, stabilize thigh during gait
Anterior part of obturator nerve division lies superficially to adductor brevis, posterior part of obturator nerve division lies on behind or posterior to adductor brevis
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Triangular muscle of the thigh that lies anteriorly, slightly medially. Lateral to adductor longus and medial to iliopsoas
Pectineus
Action
Flex thigh or adduct thigh, medial rotation
Innervation of the pectineus
Femoral nerve, sometimes obturator
Origin and insertion of the pectineus
Origin: Pectineal line of superior ramus of pubis
Insertion: Pectineal line, inferior to lesser trochanter
Long thin muscle of medial compartment of thigh that is the only adductor that crosses the knee joint
Gracilis
Actions of the gracilis
Adduction of thigh and flexion and medial rotation of the knee
Origin and Insertion of the gracilis
Origin: Inferior ramus of the pubis and body of the pubis
Insertion: Tibia (medial condyle - pes anserinus)
Innervation of the gracilis
Obturator nerve
What are the three tendons that insert on the medial condyle of the tibia?
What muscles do the tendons come from
Pes anserinus
Sartorius, Gracilis, Semitendonosis
What is the purpose of the adductor canal?
Allows the femoral artery to pass to posterior side of the knee
An area on the anterior surface of the thigh that is a triangle
Femoral Triangle
What forms the lateral border of the femoral triangle?
The medial border?
The superior border?
Sartorius - Lateral border
Adductor longus - Medial border
Inguinal Ligament - Superior Border
What forms the floor, or the posterior wall of the femoral triangle?
Pectineus, Iliopsoas, adductor longus
What runs through the femoral triangle?
Femoral nerve, femoral artery, femoral vein lie inside the triangle
NAVEL
(Nerve Artery Vein) Emptyspace Lymphnodes