Muscle shape

Muscle shape varies depending on the function of the muscle. The fleshy bulk of the muscle is known as the belly. The muscle fibres forming bundles lie parallel or obliquely to the line of pull of the muscle. Parallel fibres are found in strap-like and fusiform muscles. These long fibres allow for a wide range of movement. Oblique fibres are found in triangular and pennate muscles. These shorter fibres are found where muscle strength is required.

Tendon

Tendon

Tendon

Tendon

Strap Fusiform

Figure 2.9 Muscle shapes.

Aponeurosis Unipennate Bipennate

Multipennate

Tendon

Triangular

Multipennate

Tendon

Triangular

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