Muscles of the Thigh Flashcards
what muscles are in the anterior compartment of the thigh?
- iliopsoas
- sartorius
- quadratus femoris - rectus femoris, vastus lateralis, vastus medialis, vasteus intermedius
- pectineus
muscles of the anterior thigh are innervated by what? what is their arterial supply?
femoral nerve - L2 - L4
arterial supply - femoral artery
where does the iliopsoas pass under?
inguinal ligament
iliopsoas is a combination of what two muscles?
psoas major muscle and iliacus
what are the origins and insertions of iliopsoas?
origin - (psoas major) lumbar vertebrae and iliac fossa of pelvis (iliacus)
inserts - lesser trochanter of femur
what are the actions of ilopsoas?
flexion of thigh at hip
what is the longest muscle in the body?
sartorius
what are the origins and insertions of sartorius?
origins - ASIS
inserts - superior, medial surface of tibia
what are the actions of the sartorius?
hip - flexes, abducts, laterally rotates
knee - flexes
what is the quadratus femoris made up of?
rectus femoris
vastus lateralis
vastus medialis
vastus intermedius
what are the origins and insertions of rectus femoris
origin - AIIS and ilium
inserts - patella via quadriceps femoris tendon
what are the origins and insertions of vastus lateralis
origins - greater trochanter and lateral lip of linea aspera
inserts - patella
what are the origins and insertions of vastus medialis?
origin - interotrochanteric line and medial lip of linea aspera
inserts - patella
what are the origins and insertions of vastus intermedius
origin - anterior and lateral surfaces of femoral shaft
inserts - patella
what is the collective action of the quadratus femoris?
extension of the knee
(rectus femoris also flexes hip)
what are the origins and insertions of the pectineus?
origin - pectineal line of pubis
inserts - pectineal line on posterior femus (inferior to lesser trochanter)
what is the actions of the pectineus?
adducts and flexes hip
what muscles are in the medial compartment of the thigh?
gracilis
obturator externus
adductor brevis
adductor longus
adductor magnus
what is the innervation of the muscles in the medial thigh?
obturator artery (L2-L4)
what are the origins and insertions of obturator externus?
origin - membrane of obturator foramen
inserts - posterior greater trochanter
what are the actions of the obturator externus?
adduction and lateral rotation of thigh
what are the origins and insertions of adductor longus
origins - pubis bone
inserts - linea aspera of femur
what are the actions of the adductor longus?
adducts thigh
what are the origins and insertions of adductor magnus?
origin - inferior rami of pubis and ramus of ischium (adductor component) and ischial tuberosity (hamstring component)
inserts - linea aspera (adductor component) and adductor tubercle of femur
what are the actions of adductor magnus
adductor component - adduction and flexion of thigh
hamstring component - adduction and extension
what is the innervation of adductor magnus?
adductor - obturator nerve
hamstring - tibial component of sciatic nerve
what are the origins and insertions of adductor brevis
origin - body of pubis and inferior pubic rami
inserts - linea aspera
what is the action of the adductor brevis?
adduction
what are the origins and insertions of gracilis?
origin - inferior rami of pubis and body of pelvis
inserts - medial surface of tibial shaft
what is the action of the gracilis?
adducts thigh at hip and flexes leg at knee
what muscles are found in the posterior compartment of the thigh?
hamstrings - biceps femoris, semitendinous, semimembranous
what are the origins and insertions of semitendinosus?
origin - ischial tuberosity of pelvis
inserts - medial surface of tibia
what are the actions of the semitendinosus?
flexes leg at knee
extends thigh at hip
medially rotates leg
what is the innervation of semitendinosus and semimembranosus?
tibial part of sciatic nerve (L4-S3)
what are the origins and insertions of semimembranosus
origin - ischial tuberosity (more superior than ST)
inserts - medial tibial condyle
what are the actions of semimembranosus?
flexes lef at knee
extends thigh at hip
medially rotates leg
what is the most lateral muscle in the posterior compartment
biceps femoris
what are the origins and insertions of biceps femoris
origin - ischial tuberosity (longhead) and linea aspera (short head)
inserts - form tendon that inserts on head of fibula
what are the actions of the biceps femoris?
flexion at knee
extends thigh at hip
laterally rotates leg
what is the innervation of biceps femoris?
long head - tibial part of sciatic nerve
short head - common fibular
