Origin and Insertion definitions Flashcards
Origin and Insertion definitions
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Origin The stationary attachment point of a muscle, which does not move during contraction. Insertion The mobile attachment point of a muscle, which moves towards the origin during contraction. Bicep Brachii A major muscle of the upper arm with origin at the shoulder and insertion on the forearm, facilitating arm flexion. Bicep Femoris A hamstring muscle with origins at the ischium and femur, and insertion on the tibia and fibula, aiding knee flexion. Vastus Intermedius A muscle involved in leg extension, originating on the femur and inserting at the tibial tuberosity. Abduction Movement of a limb away from the midline of the body, facilitated by muscles like the gluteus medius. Adduction Movement of a limb towards the midline of the body, facilitated by muscles like the adductor longus. Gluteus Medius A muscle that facilitates abduction, with origin on the ilium and insertion on the greater trochanter. Adductor Longus A muscle that facilitates adduction, with origin on the pubis and insertion on the femur. Piriformis A muscle supporting leg rotation, with origin on the sacrum and insertion on the greater trochanter. Flexion A movement that decreases the angle between two body parts, such as bending the knee. Extension A movement that increases the angle between two body parts, such as straightening the leg. Greater Trochanter A bony prominence on the femur where muscles like the gluteus medius and piriformis insert. Tibial Tuberosity A bony prominence on the tibia where muscles like the vastus intermedius insert. Sacrum A triangular bone at the base of the spine, serving as an origin for muscles like the piriformis.
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