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A pennate or pinnate muscle (also called a penniform muscle) is a type of skeletal muscle with fascicles that attach obliquely (in a slanting position) to its tendon. This type of muscle generally allows higher force production but a smaller range of motion. [1] [2] When a muscle contracts and shortens, the pennation angle increases. [3]
The parallel muscle architecture is found in muscles where the fibers are parallel to the force-generating axis. [1] These muscles are often used for fast or extensive movements and can be measured by the anatomical cross-sectional area (ACSA). [3] Parallel muscles can be further defined into three main categories: strap, fusiform, or fan-shaped.
Hence, it cannot be described as the total area of the cross-sections perpendicular to the muscle fibers (green lines in figure 1). It can be interpreted two ways: Projection of PCSA (green line in figure 1) on the anatomical cross-section plane (blue line). [8] ACSA of a non-pennate muscle with the same force as the pennate muscle. [9]
The muscular system is an organ system consisting of skeletal, smooth, and cardiac muscle. It permits movement of the body, maintains posture, and circulates blood throughout the body. [1] The muscular systems in vertebrates are controlled through the nervous system although some muscles (such as the cardiac muscle) can be
Muscle types by fiber arrangement Types of pennate muscle. A – unipennate; B – bipennate; C – multipennate. Muscle architecture refers to the arrangement of muscle fibers relative to the axis of force generation, which runs from a muscle's origin to its insertion. The usual arrangements are types of parallel, and types of pennate muscle.
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The muscle architecture of pennate muscles, such as the human quadriceps, is highly plastic and strongly influences contractile properties. [6] Changes to pennate muscle architectural properties, such as pennation angle and thereby the PCSA, can alter the muscle's force-producing capabilities as well as the AGR at which the muscle operates.
A new study found that Parkinson's disease patients who took dance classes experienced fewer symptoms of depression, with dance having "a positive effect on the mood circuits in the brain."
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