Primary hip flexors include iliopsoas and rectus femoris from "summary" of Bd Chaurasia's Human Anatomy, Volumes 3 & 4 by B. D. Chaurasia
The primary hip flexors are key muscles responsible for the flexion of the hip joint. Among these, the iliopsoas and rectus femoris play a crucial role in this movement. The iliopsoas is a composite muscle formed by the iliacus and the psoas major, which are important for hip flexion. The iliacus arises from the iliac fossa and joins the psoas major, which originates from the lumbar vertebrae, to form the iliopsoas. Together, these muscles act to flex the hip joint, allowing for movements such as lifting the thigh towards the abdomen. The rectus femoris, which is one of the quadriceps muscles located in the anterior compartment of the thigh, also contributes to hip flexion. It originates from the anterior inferior iliac spine and the acetabulum of the hip bone, and inserts into the patella via the quadriceps tendon. The rectus femoris crosses both the hip and knee joints, allowing it to flex the hip as well as extend the knee. This dual function makes it an important muscle for various movements involving both joints. During activities such as walking, running, or climbing stairs, the primary hip flexors, including the iliopsoas and rectus femoris, are actively engaged to bring about hip flexion. These muscles work in coordination with other muscles of the thigh and pelvis to ensure smooth and efficient movement. Proper functioning of these hip flexors is essential for maintaining mobility and stability in the lower extremities. Understanding the role of these muscles is crucial for athletes, fitness enthusiasts, healthcare professionals, and anyone interested in the mechanics of human movement.
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