Pennate muscle

Pennate muscle is a type of muscle tissue that is characterized by its unique feather-like structure. The term "pennate" is derived from the Latin word "penna", which means feather.

Etymology

The term "pennate" has its roots in the Latin word "penna", which translates to "feather". This is in reference to the feather-like structure of the muscle fibers in pennate muscles.

Structure

Pennate muscles are one of the three types of muscle tissue in the human body, the other two being parallel muscle and convergent muscle. They are characterized by their unique feather-like structure, where the muscle fibers are arranged obliquely to the line of pull. This arrangement increases the cross-sectional area of the muscle, allowing for more muscle fibers to be packed into a smaller space, and thus increasing the force that the muscle can generate.

There are three types of pennate muscles: unipennate, bipennate, and multipennate. In unipennate muscles, the fibers are arranged on one side of the tendon. In bipennate muscles, the fibers are arranged on both sides of the tendon, resembling a feather. In multipennate muscles, the fibers are arranged at multiple angles along the tendon.

Function

The unique structure of pennate muscles allows them to generate a greater force than parallel or convergent muscles. This is because the oblique arrangement of the muscle fibers increases the cross-sectional area of the muscle, allowing for more muscle fibers to be packed into a smaller space. However, this increased force comes at the cost of reduced range of motion.

Examples

Examples of pennate muscles in the human body include the deltoid muscle, which is a multipennate muscle, and the rectus femoris muscle, which is a bipennate muscle.

See also

• Muscle tissue
• Parallel muscle
• Convergent muscle

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  Rectus femoris muscle

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  Diagram of muscle fiber arrangement

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  Pennation angle of fibers in pennate muscle

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  Anatomy of pennate muscle