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Muscle origins and insertions describe the places where a muscle attaches on bones. Conventionally, a muscle origin describes the attachment of a muscle on the more stable bone. The insertion then, is the attachment of a muscle on the more moveable bone.
Origin. Insertion. external oblique. flexing vertebral column, rotating vertebral column, compressing the abdomen. lower ribs. ilium, pubis, linea alba. internal oblique. flexing vertebral column, rotating vertebral column, compressing the abdomen. lumbar vertebrae, ilium. pubis, linea alba, lower ribs, sternum. rectus abdominis
Nov 8, 2018 · 3 min read. The main difference between origin and insertion is that origin is the attachment point of skeletal muscles, which does not move during contraction whereas insertion is the attachment point that moves during contraction. Furthermore, the origin of the skeletal muscles is more proximal while insertion is more distal when considering ...
Feb 23, 2024 · In general, it’s the attachment point that remains fixed or stable (does not move) during muscle contraction. [2] . Also known as the ‘proximal end,’ it’s typically anchored to a larger, more immobile bone like the hip or shoulder. Picture this, it’s the base from which all your muscle fibers reach out and pull or push.
1. Muscles Attach to Bones At Locations Called Origins and Insertions. A skeletal muscle attaches to bone (or sometimes other muscles or tissues) at two or more places. If the place is a bone that remains immobile for an action, the attachment is called an origin.
A muscle’s origin is usually at the attachment of its tendon to the bone with greater mass and stability. Bones at the origin of a muscle are typically those nearer the axis of the skeleton, proximal. The bone at a muscle’s insertion point is usually lighter and distal.
8. Origin: Inferior border of rib cage (Inferior costal aperture) Insertion: Central tendon. Action: Contraction increases intra-thoracic space thereby decreasing intra-thoracic pressure. 9. Origin: External, inferior borders of ribs. Insertion: Linea alba and iliac crest. Action: Flexes spine at the hip; compresses abdomen.
