Question

Highlight and name the origin and insertion areas for the; Biceps Femoris, Semimenbranousus, Semitendinousus, Gluteus maximus, and the six Deep lateral rotators. Then, show their primary and secondary (and tertiary if they have three functions) functions/movements they produce. Which of the five muscles has the GREATEST force generating capacity, and which has the LEAST and why?

Answer 1

1.Biceps femoris:-

Origin

• Long head: ischial tuberosity.
• Short head: linea aspera and lateral supracondylar line of the femur.

Insertion

• Lateral aspect of fibular head.

Functions:-

Primary function.Thigh extension.
Knee flexion.

It runs from the bottom of your tailbone to the back of the knee. ... The biceps femoris has three primary functions: extending the thigh, bending the knee, and rotating the knee toward the outside of the body. The long head is involved in thigh extension and is known as an extensor muscle.

Secondary function:It runs from the bottom of your tailbone to the back of the knee. ... The biceps femoris has three primary functions: extending the thigh, bending the knee, and rotating the knee toward the outside of the body. The long head is involved in thigh extension and is known as an extensor muscle.

2.Semimembranosus:

Origin-Ischial tuberosity.

Insertion- Medial condyle of tibia.

Functions:-

The semimembranosus muscle is attached to the pelvis and tibia via tendons. The muscle has several functions, including enabling the leg to flex and rotate, and serving as a thigh extensor. The other two muscles that make up the hamstring are the semitendinosus and biceps femoris muscles.

3.Gluteus maximus:

Origin-Gluteal surface of ilium, lumber fasia, sacrum,sacrotuberous ligament

insertion-gluteal tuberosity of the femur and iliotibial tract.

Functions:-

Primary function-Hip extension.

Secondary function-Gluteus maximus main actions are to extend and laterally rotate the hip joint. Furthermore, upper fibers can abduct the hip whereas the lower fibers can adduct. ... Superior fibers of the gluteus maximus can extend the knee through its attachment to theIliotibial tract.

4.The lateral rotator group is a group of six small muscles of the hip which all externally (laterally) rotate the femur in the hip joint.

Origin-At or below the acetabulum of the ilium.

Insertion-On or near the greater trochanter of the femur.

Functions:The overall job of the deep six lateral rotators is to keep the “ball” of the ball and socket joint (the greater trochanter of the femur) in the “socket” (the acetabulum of the pelvis) when we are walking, running or doing other movements.

Due to constraints I am unable to solve remaining part of the question.You can ask again by another post.

Thanks