Thigh Flashcards
Name the muscles in the anterior compartment of thigh.
- sartorius
2. quadriceps femoris: rectus femoris, vastus intermedius, vastus lateralis, vastus medialis
which muscle forms the roof of the adductor canal?
sartorius
*it is also the longest muscle in the body
origin/ insertion of sartorius
origin- ASIS and the notch below it
insertion- pes anserinus (on medial surface of the body of the tibia)
what is the innervation of the anterior comaprtment of the thigh?
femoral nerve
what is the arterial supply for anterior compartment of thigh?
femoral artery & profundus femoral a.
what is the function of sartorius?
flexes, abducts and laterally rotates the hip
flexes the knee and emdially rotates the leg from the flexed position
O/I of rectus femoris
origin: (2 tendons)
- straight (anterior) tendon arises from ASIS
- posterior tendon arises from a groove above acetabulum
insertion: base (superior border) of the patella via a thick aponeurotic tendon then via patellar ligament to the tibial tuberosity
which is the largest of the quadriceps muscles?
vastus lateralis
O/I of vastus lateralis?
origin- lateral lip of linea aspera, lateral lip of gluteal tuberosity, anterior and inferior borders of the greater trochanter and the proximal itnertrochanteric line
I- lateral border of patella and tendon of quadriceps femoris then via the patellar ligament to the tibial tuberosity
O/I of vastus medialis?
origin- distal intertrochanteric line, medial IM septum, tendons of adductor longus and magnus, proximal medial supracondylar line, medial lip of the linea aspera
I- medial border of the patella and the tendon of teh quadriceps femoris then via the patellar ligament to the tibial tuberosity
O/I of vastus intermedius?
O- proximal 2/3 of anterior and lateral surfaces of the femur
I- quadriceps tendon via the patellar ligament to the tibial tuberosity
O/I of articularis genu?
O- anterior surface of distal femur
I- synovial mb of the knee joint
the articularis genus is a small muscle located deep to what muscle?
vastus intermedius
which muscles make up the medial compartment of thigh?
(hip adductors)
gracilis
pectineus
what is the innervation to medial compartment of thigh?
obturator nerve
*note that pectinues m.
what is teh arterial supply to the medial compartment of thigh?
profundus femoral a.
O/I of gracilis?
O- inferior 1/2 of pubic symphysis, pubic body, and the superior 1/2 of inferior pubic ramus
I- pes anserinus
function of gracilis
adductor and medial rotator at the hip and a flexor at the knee
O/I of pectineus
origin- pecten pubis, the bone anterior to the pecten pubis btwn the pubic tubercle and the iliopectineal eminence
insertion- pectineal line (line btwn the lesser trochanter and the linea aspera) on femur
what is the pectineus innervated by?
femoral n.
note that eventhough it is in the MEDIAL compartment, it is innervated by the posterior compartment nerve- femoral n.
function of pectineus
flexion, adduction and medial rotation of the hip
O/I of adductor longus
origiin- front of the body of the pubis
insertion- media lip of the linea aspera btwn the attachments of the vastus medialis and adductor magnus
the obturator nerve divides into anterior and posterior divisions around what muscles?
adductor brevis
O/I of adductor brevis
origin- pubic body and inferior pubic ramus btwn gracilis and obturator externus
insertion- proximal part of the linea aspera
which muscles is the most anterior of the adductor muscles?
adductor longus
- adductor brevis lies posterior to adductor longus
- adductor magnus lies deep to adductor brevis
What is the adductor hiatus and in which muscle is it found?
found in the adductor magnus
allows passage of teh femoral vessels into the popliteal fossa
O/I of adductor magnus
O- inferior pubic ramus, ramus of teh ischium and the ischial tuberosity
insertion- gluteal tuberosity , linea aspera, medial supracondylar line and adductor tubercle of teh femur
innervation of adductor magnus
POSTERIOR division of obturator nerve and the tibial portion of sciatic nerve
function of adductor magnus
adductor, felxor, and extensor of the hip
*all functions are possible because fo the different fiber orientations in the muscle
Name the muscles in the posterior compartment of the thigh.
(hamstring muscles)
- biceps femoris
- semitendinosus
- semimembranosus
O/I of biceps femoris
(2 heads)
origin- long head arises from the posterior part of the ischial tuberosity ; short head originates from the lateral lip of the linea aspera, the lateral supracondylar line of the femur and from the lateral IM septum
insertion- lateral side of the styloid process of the head of fibula and lateral condyle of tibia
innervation of long and short head of biceps femoris?
long head- tibial nerve (makes sense it is in posterior thigh)
short head- COMMON PERONEAL NERVE
function of biceps femoris
both heads act to flex the knee and laterally rotate the knee from the flexed position
*the long head EXTENDS and laterally rotates the hip
O/I of semitendinosus
origin- ischial tuberosity
insertion- proximal part of the medial surface of the tibia
function of semitendinosus
flex the knee and a medial rotator from full flexion
it also extends the hip
O/I of semimembranosus
origin- ischial tuberosity
insertion- medial surface of the medial tibial condyle and to posterior surface of lateral femoral condyle
function of semimembranosus
flexor at the knee and medial rotator from full flexion
also extends the thigh
which muscle gives rise to fibers that proceed superolaterally to form the oblique popliteal ligament?
semimembranosus
which is the only quadriceps muscle in the thigh that allows you to flex the hip also (because it crosses that joint)?
rectus femoris
it originates from the AIIS
