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A myofibril (also known as a muscle fibril or sarcostyle) [1] is a basic rod-like organelle of a muscle cell. [2] Skeletal muscles are composed of long, tubular cells known as muscle fibers, and these cells contain many chains of myofibrils. [3] Each myofibril has a diameter of 1–2 micrometres. [3]
The unusual microscopic anatomy of a muscle cell gave rise to its terminology. The cytoplasm in a muscle cell is termed the sarcoplasm; the smooth endoplasmic reticulum of a muscle cell is termed the sarcoplasmic reticulum; and the cell membrane in a muscle cell is termed the sarcolemma. [9]
Striated muscle tissue is a muscle tissue that features repeating functional units called sarcomeres.Under the microscope, sarcomeres are visible along muscle fibers, giving a striated appearance to the tissue.
Muscle fiber showing thick and thin myofilaments of a myofibril. There are three different types of myofilaments: thick, thin, and elastic filaments. [1] Thick filaments consist primarily of a type of myosin, a motor protein – myosin II. Each thick filament is approximately 15 nm in diameter, and each is made of several hundred molecules of ...
The sarcolemma (sarco (from sarx) from Greek; flesh, and lemma from Greek; sheath), also called the myolemma, is the cell membrane surrounding a skeletal muscle fibre or a cardiomyocyte.
This image is a derivative work of the following images: File:Sarcomere.jpg licensed with Cc-by-2.5, Cc-by-sa-3.0-migrated, GFDL 2006-02-27T12:42:05Z JeeJee 800x600 (29399 Bytes) Lihaksen sarkomeeri, omaa työtä, lisään muut tiedot kun olen saanut ladattua kuvan. Uploaded with derivativeFX
A sarcomere (Greek σάρξ sarx "flesh", μέρος meros "part") is the smallest functional unit of striated muscle tissue. [1] It is the repeating unit between two Z-lines
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