post thigh code Flashcards
What muscles are in the posterior compartment of the thigh?
The hamstring muscles include the biceps femoris, semitendinosus, and semimembranosus. The hamstring portion of the adductor magnus also has similar actions.
What nerve innervates the hamstring muscles?
The hamstring muscles are innervated by the sciatic nerve (L4-S3).
What is the action of the hamstring muscles?
The hamstrings extend the thigh at the hip and flex the leg at the knee.
Where do the hamstrings originate from?
The hamstring muscles originate from the ischial tuberosity of the pelvis.
Where does the biceps femoris insert?
The biceps femoris inserts into the head of the fibula.
What is the main action of the biceps femoris?
The main action of the biceps femoris is knee flexion, along with thigh extension, and lateral rotation at the hip and knee.
How are the two heads of the biceps femoris innervated?
The long head of the biceps femoris is innervated by the tibial part of the sciatic nerve, while the short head is innervated by the common fibular part.
Where does the semitendinosus insert?
The semitendinosus inserts into the medial surface of the tibia.
What is the action of the semitendinosus?
The semitendinosus flexes the leg at the knee, extends the thigh at the hip, and medially rotates the thigh at the hip and the leg at the knee.
Where does the semimembranosus insert?
The semimembranosus inserts into the medial tibial condyle.
What are the actions of the semimembranosus?
The semimembranosus flexes the leg at the knee, extends the thigh at the hip, and medially rotates the thigh at the hip and the leg at the knee.
What injury can occur with sudden forceful contraction of the hamstrings?
An avulsion fracture of the ischial tuberosity can occur, especially in adolescents, due to sudden and forceful contraction of the hamstrings.
How can hamstring avulsion fractures be treated?
Treatment options for hamstring avulsion fractures include conservative methods (rest, pain control, physiotherapy) or surgical options (open reduction and internal fixation).
