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Which type of muscle fascicle pattern has an appearance similar to a feather?
a. Fusiform
b. Triangular
c. Pennate
d. Parallel
Introduction:
The functioning of the skeletal muscles is influenced greatly by the appearance and the structure of the fascicle arrangement. According to this arrangement, there are six fascicle patterns, namely, parallel, convergent, pennate, circular, spiral, and fusiform.
Answer to Problem 1CYR
Correct answer:
The fascicle and muscular fiber patterns of the pennate muscle are attached to a tendon at an angle, which gives it a feather-like apperance.
Explanation of Solution
Justification for the correct answer:
Option (c) is pennate. The fascicle pattern of the pennate muscle resembles a feather as all the fibers of the muscles are attached to a tendon in such a way that it gives the muscle the appearance of a feather. Hence, option (c) is correct.
Justification for incorrect answers:
Option (a) is fusiform. The fusiform muscles do not have a feather-like appearance as they are thick in the middle while the ends are tapered. Hence, it is false because this pattern does not resemble a feather. So, this option is incorrect.
Option (b) is triangular. The triangular muscle fascicle pattern has an appearance similar to that of feather but it is false as the shape of the fascicle pattern is not like that of a feather; the convergent or triangular muscle fascicle pattern is broad at one end and uniformly tapered toward a single tendon. Thus, they are not feather shaped. So, this option is incorrect.
Option (d) is parallel. The parallel muscle fascicle pattern is evenly spaced muscles just as the name implies, and the fascicles are arranged to a tendon that is of the same width; they have the appearance of a strap. Thus, the parallel muscle fascicle pattern does not have a feather-like appearance. So, this option is incorrect.
Hence, options (a), (b), and (d) are incorrect
Thus, it can be concluded that different muscles possess varied muscle fascicle patterns. The pennate muscle fascicular pattern resembles a feather and it has different variations depending on the number of fascicle patterns, like unipennate, bipennate, and multipennate
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