Dictionary » S » Sarcolemma




The thin, transparent, extensible membrane covering every striated muscle fiber. It consists of a cell membrane (plasma membrane) and an outer coat made up of a thin layer of polysaccharide material with numerous thin collagen fibrils.


Its structure and design is essential in receiving and conducting stimuli. At every end of the muscle fiber, the outer layer of the sarcolemma fuses with a tendon fibers, which in turn collect into bundles to form muscle tendons.

Word origin: sarco- + Greek lemma, husk.

Synonym: myolemma.

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Re: Muscle Contractions

... muscular cell. This gives it enough "voltage" to reach its threshold which initiates an action potential on the muscle cell membrane (sarcolemma) which stimulates Ca2+ release from the sarcoplasmic reticulum to stimulate contraction (second messenger). The myosin fibers (on actin) ...

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by Jpoley
Tue Mar 01, 2011 2:42 am
Forum: Human Biology
Topic: Muscle Contractions
Replies: 1
Views: 7861

Stimulation of a Motor Nerve

Trace the sequence of events starting from the moment acetylcholine binds to its receptors in the sarcolemma and ending when the crossbridges have completed one power stroke.

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by Kelly185891
Fri Oct 29, 2010 2:48 am
Forum: Physiology
Topic: Stimulation of a Motor Nerve
Replies: 1
Views: 2925

Biology Hangman Game


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by Cat
Thu Jul 03, 2008 2:49 am
Forum: General Discussion
Topic: Biology Hangman Game
Replies: 582
Views: 207183

Need help, research

... .. that respond to external stimuli. muscles are activated by somatic motorneurons which release Ach and other substances that deploarise the sarcolemma. Thus highly dependant on receptors (including the internal receptors on the sarcoplasmic reticulum which releases Ca(2+) into the sarcoplasm)

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by sdekivit
Sun Jul 16, 2006 6:14 pm
Forum: Cell Biology
Topic: Need help, research
Replies: 8
Views: 4152

muscles and bones

... Muscles can exert force by contracting and they also produce most of the heat that allows for the homeothermic condition. Check out actin, myosin, sarcolemma, intercalatid disc, visceral muscle. Doc44 Will stop here.....got to eat my pizza now.

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by Doc44
Mon May 15, 2006 12:10 am
Forum: Human Biology
Topic: muscles and bones
Replies: 3
Views: 2820
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