Hamstrings Flashcards
Name the muscles in the Hamstring group
Biceps femoris
Semimembranosus
Semitendinosus
Briefly describe the Biceps Femoris position
A fusiform muscle situated on the superficial posterolateral aspect of the thigh and lateral border of popliteal fossa
Name the proximal attachments of Biceps Femoris
Long head - inferomedial part of the ischial tuberosity
Short head - lower half of the lateral lip linea aspera, upper half of the lateral supracondylar line of the femur
Give the distal attachment of the Biceps Femoris
Gets split in two by the lateral collateral ligament
Attaches to the apex head of the fibula, Slip to lateral Tibial condyle
Give the action(s) of the bicep femoris
Extends the hip
Flexes the Knee
Laterally rotates the leg when knee is semiflexed
What are the action(s) of Semitendinosus and Semimembranosus?
Extension of the hip
Flexion of the knee
Medial rotation the leg when the knee is at 90 degrees of flexion
Give the attachments of Semitendinosus.
Proximally: the inferomedial part of the ischial tuberosity
Distally: the anteromedial surface of proximal tibia medial at Pes Anserinus, posterior to sartorius and gracilis
Give the attachments of Semimembranosus.
Proximally: superolateral impression of the ischial tuberosity.
Distally: posteromedial surface of the medial tibial condyle.
Name the third muscle in the Hamstring group.
Semitendinosus and Semimembranosus given
Biceps Femoris
Name one functional activity in which the Hamstrings participate.
Principally active in raising the trunk from the flexed position and control movement eccentrically when bending down to pick something up from the floor.
Hip extension and Knee flexion phase of running/kicking
Innervation of hamstrings
Sciatic nerve: L5-S2
Biceps femoris long head: tibial division of sciatic nerve
Biceps femoris short head: common peroneal division of sciatic nerve
