Sarcolemma


Also found in: Dictionary, Thesaurus, Medical, Wikipedia.
Related to Sarcolemma: myofibril

sarcolemma

[‚sär·kə′lem·ə]
(histology)
The thin connective tissue sheath enveloping a muscle fiber.

Sarcolemma

 

the delicate membrane that invests smooth-muscle cells and striated and myocardial fibers. The term “sar-colemma” was introduced by the British physician W. Bowman in 1840. A sarcolemma consists of a three-layer cell membrane, which is approximately 75 angstroms thick and similar to the cell membrane in other animal cells, and a basilar membrane, which is a layer of amorphous matter containing polysaccharides. In vertebrates the basilar membrane of muscle cells and muscle fibers usually contains collagen fibrils.

REFERENCES

De Robertis, E., W. Nowinski, and F. Saez. Biologiia kletki. Moscow, 1967. (Translated from English.)
Elektronno-mikroskopicheskaia anatomiia. Moscow, 1967. (Translated from English.)
References in periodicals archive ?
Plectin 1f scaffolding at the sarcolemma of dystrophic (mdx) muscle fibers through multiple interactions with beta-dystroglycan.
channels (located in the mitochondria of cardiomyocytes, or in sarcolemma of cardiac neurons and endothelial cells).
Several NOX isoforms are expressed in striated muscle and located within the sarcoplasmic reticulum, the sarcolemma, and the transverse tubules [34, 35].
Histopathological investigation showed muscle damage such as separations between the myofibrils, increased connective tissue between the muscle fibers, loss of striations and the circular formation of the nuclei that were transferred to the centrum beneath the sarcolemma (16) to be highest in the next day following the exhausting exercise, both in the T group and more prominently in the UT group (Figure 3).
9) The hyperosmolarity associated with HHS is thought to reduce the integrity of the sarcolemma leading to the loss of ionic gradients across the cell membrane.
channels within the sarcolemma of fast-twitch muscle fibers, compared with slow-twitch muscle fibers, the generation of higher frequency action potentials, and hence EMG signals, from fast-twitch muscle fibers, the significant relation between the EMG median frequency and muscle fiber conduction velocity and the progressive recruitment of fast-twitch muscle fibers at higher contraction intensities [8,16-18].
This procedure can be applicable on muscle tissues that need to be studied for enzymes and IHC to know the status of sarcolemma.
Muscle cells use the root "sarco" to make sarcolemma, sarcoplasm, sarcoplasmic reticulum, and the sarcomere, just like Batman has the batcave, the batmobile, and the batcopter.
129) Normal muscle contraction and relaxation are energy-dependent processes that require the activities of a sodium-potassium ATPase on the sarcolemma (a calcium-dependent ATPase in the sarcoplasmic reticulum) and a magnesium-dependent ATPase in the sarcoplasm.
Insulin activates the phosphoinositol-3-kinase (PI3K) pathway that causes skeletal muscle's glucose transport protein (GLUT4) to translocate to the sarcolemma and, therefore, permits glucose to enter the cell.
Sarcolemma comprovincial meaty calamine, overcrowding.