Fascicle Arrangements definitions Flashcards
Fascicle Arrangements definitions
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Fascicle A group of muscle fibers bound together, running the entire length of a muscle without joining end to end. Parallel arrangement Muscle fibers run parallel to each other, allowing significant shortening but limited force due to fewer fibers. Fusiform arrangement Spindle-shaped muscle with fibers wider in the middle, allowing more force while maintaining a parallel arrangement. Convergent arrangement Muscle with a broad origin converging at a smaller insertion, enabling strong contraction with long fascicles. Circular arrangement Muscle fibers arranged in a circle, surrounding openings and contracting to close them, also known as a sphincter. Pennate arrangement Feather-like muscle fibers running at angles to a central tendon, allowing more fibers and greater force. Unipennate Muscle fibers run at an angle from one side of a tendon, allowing more force but shorter contraction lengths. Bipennate Muscle fibers extend from both sides of a central tendon, allowing more force but shorter contraction lengths. Multipennate Muscle fibers extend from a branched tendon, allowing more force but shorter contraction lengths. Sartorius The longest muscle in the body, with a parallel fascicle arrangement, allowing significant shortening. Biceps brachii A fusiform muscle in the upper arm, spindle-shaped, allowing more force while maintaining a parallel arrangement. Pectoralis major A convergent muscle of the chest with a broad origin and small insertion, enabling strong contraction. Orbicularis oculi A circular muscle surrounding the eye, contracting to close the eye opening. Extensor digitorum longus A unipennate muscle in the calf, with fibers running at an angle from one side of a tendon. Rectus femoris A bipennate muscle of the quadriceps, with fibers extending from both sides of a central tendon.
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