Medial condyle of tibia – horizontal cavity on the back
3 expansions
forwards along medial surface of condlye deep to the tibial collateral ligament, separated from it by a bursa
obliquely upwards to lateral femoral condyle as the oblique popliteal ligament
strong fascia overlying popliteus & reaches the soleal line of the tibia
Nerve Supply
Action
Semit>Semitendinosus
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Origin
Medial part of ischial tuberosity
On top of semimebranosus
Insertion
Tendon passes behind the medial condle & then curves forwardes to be inserted behind gracilis into the upper part of the subcutaneous surface of the tibia
Nerve Supply
Action
Bicep>Biceps femoris
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Sciatic nerve is beneath the long head
Origin
Long Head:
In common with semitendinosus
Short Head:
Whole length of linea aspera & upper part of lateral supracondylar line of femur
Insertion
Head of Fibula
Blood>Blood Supply of the Hamstrings
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Upper
Inferior gluteal artery
Middle (main supply)
Profunda femoris artery & its perforating branches
Lower
Popliteal artery
These arteries form a series of anastomoses along the back of the thigh, the highest being the cruciate anastomosis
Nerve>Nerve Supply
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Tibial component of the sciatic nerve (L5S1)
Ischial part of adductor magnus
All three muscles
Common peroneal nerve
Short head of biceps
Actio>Action
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Flexion of knee
Extension of hip
With knee semiflexed
biceps femoris is lateral rotator
semitendinosus/membranosus are medial rotators
Sciat>Sciatic nerve
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Passes through long head of biceps & adductor magnus
At popliteal fossa, a hands breath above knee joint it divides into tibial & common peroneal components
Surface Markings –
Midpoint between ischial tuberosity & greater trochanter to the apex of the popliteal fossa
