**Core Concept**
The Huxley-Henley layers refer to the three layers of the myoplasm found within a muscle fiber. These layers are composed of different types of myofilaments and play a crucial role in muscle contraction.

**Why the Correct Answer is Right**
The Huxley-Henley layers consist of the A-band (thick filaments composed of myosin), the I-band (thin filaments composed of actin), and the H-zone (a region within the A-band where only thick filaments are present). The I-band is further divided into the Z-disk and the I-band proper, where the thin filaments are anchored. The Huxley-Henley layers are essential for understanding muscle physiology and are a key concept in the study of muscle contraction and relaxation.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not accurately describe the Huxley-Henley layers.
* **Option B:** This option is incorrect because it is not a recognized component of the Huxley-Henley layers.
* **Option D:** This option is incorrect because it is not a correct description of the Huxley-Henley layers.

**Clinical Pearl / High-Yield Fact**
The Huxley-Henley layers are crucial in understanding the sliding filament theory of muscle contraction, which is essential for diagnosing and managing muscle disorders.

**Correct Answer: B. Myofibrils**