Posterior Thigh Flashcards
What are the posterior thigh muscles collectively known as?
Hamstrings
What nerve innervates the posterior thigh?
Sciatic nerve
What are the nerve roots of the sciatic nerve?
L4-S3
Name the four hamstrings
Biceps femoris, Semitendinosus, Semimembranosus and adductor magnus (portion)
What are the origins of the biceps femoris?
Long head - ischial tuberosity
Short head - linea aspera
What is the insertion of the biceps femoris?
Head of fibula
What are the functions of the biceps femoris muscle?
Hip extension, knee Flexion and lateral rotation
What is the common origin of the hamstrings?
Ischial tuberosity
What is the insertion of the Semitendinosus muscle?
Pes anserinus (anterior medial tibia)
What are the functions of the Semitendinosus muscle?
Hip extension, knee Flexion and medial rotation
What is the insertion of the Semimembranosus muscle?
Medial condyle of tibia
What are the functions of the Semimembranosus muscle?
Hip extension, knee Flexion and medial rotation
What is the insertion of the hamstring portion of the adductor Magnus muscle?
Adductor tubercle of femur
What are the functions of the hamstring portion of the adductor Magnus?
Hip extension and adduction
What action can lead to ischial tuberosity avulsion?
Rapid contraction and relaxation of hamstrings (sprinting)
