- 【Updated on May 12, 2025】 Integration of CiNii Dissertations and CiNii Books into CiNii Research
- Trial version of CiNii Research Knowledge Graph Search feature is available on CiNii Labs
- Suspension and deletion of data provided by Nikkei BP
- Regarding the recording of “Research Data” and “Evidence Data”
Ultrastructural Differences Between Longitudinal and Circular Muscle Cells of the Guinea Pig Stomach
Search this article
Description
The ultrastructure of the longitudinal and circular muscle cells of the guinea pig stomach, known to display different contractile responses, was compared. The longitudinal muscle layer consisted of about 20 layers of smooth muscle cells and the extracellular space occupied about 12.1% of the cross sectional area. The circular muscle layer consisted of closely packed muscle bundles arranged side by side. The extracellular space within the bundle represented about 4.4% of the cross sectional area. Nexuses were consistently found in the circular muscle layer but could not be found in the longitudinal muscle layer. Numbers of both mitochondria and microtubules per unit area of smooth muscle cell were larger in the longitudinal than in the circular muscle. The cell area occupied by the sarcoplasmic reticulum was about 4.7% in the longitudinal muscle cell, twice as much as in the circular muscle cell (2.3%). Numbers of caveolae per micrometer of the cell perimeter were almost the same in both tissues. There were approximately 25 and 50 thick filaments per 0.5 μm2 of cytoplasmic area in the longitudinal and circular muscle cell, respectively. A lower pH fixative (cacodylate, pH 6.6) gave a better contrast of specimens than other fixatives used, and an organic buffered (PIPES) fixative led to a more regular arrangement of myofilaments. But the characteristic distribution of the thick filaments between both muscles was not different among the specimens fixed with these fixatives.
Journal
-
- 札幌医学雑誌 = The Sapporo medical journal
-
札幌医学雑誌 = The Sapporo medical journal 49 (4), 391-401, 1980-08-01
札幌医科大学医学部
- Tweet
Details 詳細情報について
-
- CRID
- 1390290699785638400
-
- NII Article ID
- 120002081652
-
- ISSN
- 0036472X
-
- Text Lang
- en
-
- Article Type
- departmental bulletin paper
-
- Data Source
-
- JaLC
- IRDB
- CiNii Articles
-
- Abstract License Flag
- Allowed