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sarcolemma

The cell membrane of a muscle fiber, consisting of a plasma membrane and an outer layer of polysaccharide material.
Noun
pl: sarcolemmas

This term is a specialized anatomical descriptor used almost exclusively in histology, physiology, and medical contexts. It describes the complex boundary of a muscle cell, which is distinct from a simple plasma membrane due to the presence of the external basal lamina.

Because it refers to a specific biological structure, it is typically used in technical descriptions of muscle contraction, ion transport, or neuromuscular diseases. It is rarely encountered in general conversation or non-scientific literature.

Meanings

Noun

The cell membrane of a muscle fiber, consisting of a plasma membrane and an outer layer of polysaccharide material.

The sarcolemma regulates the flow of ions into the muscle cell during contraction.

Examples

The sarcolemma acts as a barrier between the intracellular and extracellular environments of the muscle fiber.

none

The sarcolemma acts as a barrier between the intracellular and extracellular environments of the muscle fiber.

Action potentials propagate along the sarcolemma to trigger muscle contraction.

School Life

Action potentials propagate along the sarcolemma to trigger muscle contraction.

Look at the slide and notice how the sarcolemma wraps around the entire muscle cell.

School Life

Look at the slide and notice how the sarcolemma wraps around the entire muscle cell.

I wonder if the damage to the sarcolemma is what causes the leakage of creatine kinase into the blood.

none

I wonder if the damage to the sarcolemma is what causes the leakage of creatine kinase into the blood.

The T tubules are essentially deep invaginations of the sarcolemma.

none

The T tubules are essentially deep invaginations of the sarcolemma.

Dystrophin provides a critical structural link between the cytoskeleton and the sarcolemma.

none

Dystrophin provides a critical structural link between the cytoskeleton and the sarcolemma.

Is the sarcolemma permeable to these specific ions during depolarization?

School Life

Is the sarcolemma permeable to these specific ions during depolarization?

The outer layer of the sarcolemma contains a thin coating of polysaccharide material.

none

The outer layer of the sarcolemma contains a thin coating of polysaccharide material.

A rupture in the sarcolemma can lead to severe muscle dysfunction and cell death.

none

A rupture in the sarcolemma can lead to severe muscle dysfunction and cell death.

Related Words

musclecellmembranecytoplasmmyocytemyofibrilmyofilamentactinmyosinsarcoplasmlipidproteinphospholipidbilayerionchannelsodiumpotassiumcalciumvoltagepotentialdepolarizationrepolarizationaction potentialexcitationcontractionrelaxationsarcomeretroponintropomyosinglycoproteinintegrincytoskeletonextracellular matrixendomysiumperimysiumepimysiumfasciafiberbundleorganellemitochondrianucleusdiffusionosmosispermeabilitytransportpumpATPasemyofibrillarskeletal musclecardiac musclesmooth musclehypertrophyatrophydystrophymyopathyphysiologyanatomyhistologycytologybiochemistryelectrophysiology
Última actualización: May 2026Reportar un error