Posterior thigh Flashcards
Name the hamstring muscles
Semimembranosus
Semitendinosus
biceps femoris (long head)
Semimembranosus - Origin , Insertions, Innervation, Action
o- Superior lateral quadrant of ischael tuberosity
i - Posterior surface of the medial tibial condyle
i- TIBIAL NERVE - (L5, S1, S2)
A - Extends thigh, flexes Knee, rotates tibia medially - especially when knee flexed
Semitendinosos - Origin, Insertion, Innervation, Action
o - common tendon - superior medial quadrant of posterior portion of ischael tuberosity
i - superior aspect of the medial portion of the shaft of tibia
i- tibial nerve - L5, S1,S2
a - Extends thigh, flexes Knee, rotates tibia medially - especially when knee flexed
Biceps femoris - origin, insertion, innervation, action
o - common tendon - superior medial quadrant of posterior portion of ischael tuberosity
i- fibula head and lateral collateral ligament and tibial condyle
i- tibial nerve L5,S1,S2
a- Flexes knee, rates tibia laterally, extends hip joint
why is the short head of bicepts femoris NOT part of the hamstrings
does not share the common proximal attachment and innervation
what compartment does short head of biceps femoris belong to
Flexor compartment
Biceps femois - short head - Origins, insertion, innervation and actoin
o- lateral lip of linea aspera
i - fibular head, lateral tibial condyle
i - common peroneal portion of sciatic nerve (both L5, S1
a - Flexes and laterally rotates knee
Function of hamstrings at hip
extend the hip
function of hamstrings at knee
flex knee
semimembranosus/ semitendinosus - medial tibial rotation
long head biceps - lateral tibial rotation
Adductor Magnus is from which compartment
considered part of Hamstrings
MEDIAL muscle compartment
What are the two parts of adductor magnus
hamstring part - vertical head
adductor part - oblique head
Adductor Magnus - Oblique Head - Origin, Insertion, innervation, action
o - inferior ramis of pubis and ischael ramis
i - gluteal tuberosity, linea aspera, proximal supraepicondyle line of femur
i - Obturator nerve - L2 -L4
a - adduct and flex at hip
Adductor magnus - vertical head - O, I, Innervation, A
o - ischael tuberosity
i - adductor tubercle of femur
i - sciatic nerve L2 - L4)
a - extend thigh at hip
what runs through perforations in adductor magnus
branches of deep artery of the thigh
most inferior perforation = terminal end of deep artery of the thigh
what does the sciatic nerve divide into
Common Fibular (peroneal) and Tibial Nerves
what direction does the common fibular nerve deviate
laterally
what direction does the tibial nerve travel
down the midline
where doe the branches of sciatic nerve enter
popliteal fossa
What is the popliteal fossa
diamond shaped depression on the posterior aspect of the knee
what muscles form the borders of the popliteal fossa
x4
biceps femoris, semimembranosus, semitendinosus, medial and lateral heads of Gastrocnemius
what runs through the popliteal fossa
tibial nerve
popliteal vein
popliteal artery
what nerve runs along the lateral edge of the popliteal fossa
common perineal nerve
what vessel emerges from between the heads of gastrocnemius
small saphenous vein
what forms the roof of the popliteal fossa
deep fascia - continuous with fascia late of the thigh and the deep fascia of the leg
