The arrangement of muscle fibers in which the fibers are arranged at an angle to a central longitudinal tendon is a. circular, b. longitudinal, c. pennate, d. parallel.

Video transcript

Hi everyone. Let's take a look at this practice problem together which of the following statements is true regarding the pennate muscle fiber arrangement. Now, before we read through the answer options together, let's talk about muscle fiber arrangement in muscles, phys, the physical arrangement of muscle fibers can produce different sizes and structures. And so this can affect muscle function and there's various types of arrangement and pinnate is just one of them. So let's go ahead and go through the answer options. Now, option A, the muscle fibers are arranged in concentric circles around an opening or a body passage. So this type of arrangement is called circular. You have those concentric circles. So option A is incorrect. Option B, the muscle fibers are arranged parallel to the longitudinal axis of the muscle. This describes a longitudinal arrangement. So option B is incorrect. Option C, the muscle fibers are parallel to the length of the muscle that describes a parallel arrangement. So thus far it's been straightforward. So option D by process of elimination must be the correct answer. And option D states the muscle fibers are arranged at an angle to a central longitudinal tendon giving the muscle, a feather like appearance. So on the screen, I am putting up a drawing, the black line which is a longitudinal line represents the tendon and the blue lines represents the muscle fibers. In penny arrangement, the muscle fibers are located oblique to the tendon and that gives it a somewhat feather like appearance. So again, the correct answer is option d the muscle fibers are arranged at an angle to a central longitudinal tendon giving the muscle, a feather like appearance. All right, everyone. I hope you found this helpful and I'll see you soon for the next practice problem.