Hamstrings Anatomy & Function 💪 Origins, Insertions, ...

The video tutorial explains the anatomy and functions of the hamstring muscles, focusing on the sciatic nerve and its divisions. It covers the semitendinosus, semimembranosus, and biceps femoris muscles, detailing their origins, insertions, innervations, and actions. The tutorial also discusses the adductor magnus as a functional hamstring muscle and highlights the differences between the long and short heads of the biceps femoris. The video concludes with an overview of the sciatic nerve's role in innervating these muscles.

Which nerve roots contribute to the tibial division of the sciatic nerve?

• S1 through S3

• L5 through S2

• L3 through L5

• L1 through L3

What is the primary action of the semitendinosus muscle at the hip joint?

• Hip abduction

• Hip flexion

• Hip extension

• Hip adduction

Where does the semimembranosus muscle attach on the tibia?

• Anterior surface

• Medial condyle

• Posterior surface

• Lateral condyle

What distinguishes the tendons of semitendinosus and semimembranosus?

• Both have thin tendons proximally

• Semitendinosus has a thin distal tendon

• Both have thick tendons distally

• Semimembranosus has a thin distal tendon

What is the origin of the long head of the biceps femoris?

• Medial condyle of the tibia

• Inferomedial part of the ischial tuberosity

• Lateral lip of the linea aspera

• Adductor tubercle of the femur

Which division of the sciatic nerve innervates the short head of the biceps femoris?

• Obturator nerve

• Common fibular division

• Femoral nerve

• Tibial division

What is the primary function of the hamstring part of the adductor magnus?

• Hip extension

• Knee flexion

• Hip abduction

• Knee extension

Which nerve innervates the hamstring part of the adductor magnus?

• Femoral nerve

• Sciatic nerve, tibial division

• Sciatic nerve, common fibular division

• Obturator nerve

What happens to the sciatic nerve at the superior part of the popliteal fossa?

• It remains as a single nerve

• It becomes the obturator nerve

• It divides into the tibial and common fibular nerves

• It merges with the femoral nerve

Which component of the sciatic nerve gives off motor branches to the semitendinosus?

• Femoral component

• Common fibular component

• Tibial component

• Obturator component