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SOVA2
2 months ago
14

The muscles that surround external body openings typically have a ________ fascicle arrangement. parallel convergent pennate cir

cular
Biology
1 answer:
Rainbow [2.3K]2 months ago
8 0
In a parallel configuration, the fascicles run parallel to the muscle’s long axis. Muscles can be strap-like, such as the sartorius of the thigh, or bulging, like the biceps brachii of the arm. Some researchers categorize bulging muscle shapes asfusiform muscles.In a pennate arrangement, the fascicles are short, attaching obliquely to a central tendon running the muscle's length. There are three forms of pennate muscles:<span><span>Unipennate, where fascicles connect to one side of the tendon, like the extensor digitorum longus of the leg. </span><span>Bipennate, where the fascicles attach from both sides, causing the muscle “grain” to look reminiscent of a feather; the rectus femoris of the thigh is an example of this type.
Multipennate, which resembles multiple feathers side by side, with all quills attached to a central tendon. The deltoid muscle, giving the shoulder its rounded shape, exemplifies a multipennate structure.</span></span>

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