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Smooth muscle can be stimulated by pacesetter cells, by the autonomic nervous system, by hormones, spontaneously, or by stretching. The fibers in some smooth muscle have latch-bridges, cross-bridges that cycle slowly without the need for ATP; these muscles can maintain low-level contractions for long periods.
- Lindsay M. Biga, Sierra Dawson, Amy Harwell, Robin Hopkins, Joel Kaufmann, Mike LeMaster, Philip Mat...
- 2019
Nov 7, 2023 · Functional anatomy. Smooth musculature is ubiquitous in viscera and blood vessels. At certain sites, smooth and skeletal muscles come into contact coordinating the contractile force and direction with each other (e.g., esophagus, rectum and pelvic floor) ( Anat Sci Int 2023;98:407 )
Jun 26, 2022 · When cut in longitudinal section, smooth muscle nuclei appear very long and sometimes wiggly (due to contraction). In cross-sectioned smooth muscle, only a fraction of the fibers display nuclei. Recall that each smooth muscle fiber is a single cell, each with its own nucleus.
Apr 26, 2021 · #1. Smooth muscle cells or fibres of the longitudinal section. #2. The nucleus of smooth muscle cells or fibres of the longitudinal section. #3. Connective tissue surrounds the smooth muscle fibers or cells with fibroblasts. #4. Cross section of smooth muscle cells. #5. The nucleus of smooth muscle cells from cross-sectional tissue. #6.
Many longitudinal bundles of smooth muscle are cross sectioned in the outer wall of this large vein. Some bundles of smooth muscle look strange, almost nerve-like, because few or no nuclei appear at section level. At high power, many cell boundaries appear serrated like postage stamps.
When viewed in longitudinal section, smooth muscle cells are long and cigar shaped, appearing almost to interdigitate with each other. This reflects the overlapping of the individual smooth muscle cells. Smooth muscle, when viewed in cross section, presents a considerable variation in cell and nucleus size.
Cardiac muscle is arranged as a cross-branched network of fibers, so they will often appear in both cross and longitudinal sections on slides. Refer to this orientation image to see where to look for each in this slide and focus first on the area where fibers are mostly seen in cross section.
