Which section type of smooth muscle shows parallel alignment of fibers along the length of the tissue?

Which section type of smooth muscle shows parallel alignment of fibers along the length of the tissue?

• A. Cross section
• B. Longitudinal section
• C. Transverse section
• D. Oblique section

Answer: (B)

Understanding how tissue sections reveal fiber orientation helps explain this. Smooth muscle fibers run largely parallel along the length of the tissue, so a cut made along that length shows those fibers running in the same direction. In a longitudinal section, you see elongated, spindle-shaped cells aligned in parallel along the length of the tissue, reflecting their true longitudinal arrangement. If you cut perpendicular to the fibers—a cross or transverse section—you’d see the fibers cut end-on, appearing as round or oval profiles rather than parallel strands. An oblique section would show fibers at an angle to the plane, not parallel. So the section that displays parallel alignment of smooth muscle fibers along the length is the longitudinal section.

Understanding how tissue sections reveal fiber orientation helps explain this. Smooth muscle fibers run largely parallel along the length of the tissue, so a cut made along that length shows those fibers running in the same direction. In a longitudinal section, you see elongated, spindle-shaped cells aligned in parallel along the length of the tissue, reflecting their true longitudinal arrangement. If you cut perpendicular to the fibers—a cross or transverse section—you’d see the fibers cut end-on, appearing as round or oval profiles rather than parallel strands. An oblique section would show fibers at an angle to the plane, not parallel. So the section that displays parallel alignment of smooth muscle fibers along the length is the longitudinal section.