Dictionary » M » Myofibril



noun, plural: myofibrils

(1) Long, cylindrical organelle in striated muscle cells, composed mainly of actin and myosin filaments that run from one end of the cell to the other.

(2) The contractile unit of a striated muscle.


The actin and myosin filaments are organized into repeated subunits along the length of the myofibril. These subunits are called sarcomeres.

Word origin: myo- (muscle) + fibril.
Related term: myofibrillar (adjective).


  • sarcostyle (obsolete)

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Re: Special heart muscle

... of it's features that might help youi. Microscopic anatomy: * Short fat branching cells *One large central nucleus per cell *Intercalated discs * Myofibril-like units *High capillary density *Large no. of mitochondria *Large sarcoplasmic reticulum & T.Tubule system Functions: * Drives O2, ...

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by opuntia
Fri Jul 08, 2005 12:26 pm
Forum: Human Biology
Topic: Special heart muscle
Replies: 1
Views: 3937

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