Category Archives: Muscle

Sarcomere TEM

This micrograph shows the typical structure of the sarcomere with the Z-Line and M-Band. Each sarcomere unit is approximately 2μ in length and consists of paralelle myosin and actin filaments. Numerous mitochondria (M) are shown at the bottom of the figure. (from U. Penn- link)

mouseover for labels.  Image from Univ Pennsylvania

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Mitochondria can be found nestled between myofibrils of muscle.

Image of Cardiac muscle sarcomeres and mitochondria from (link).   Image by Fred Hossler (link)

Mitochondria in blue

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Smooth Muscle

Smooth muscle is responsible for the contractility of hollow organs, such as blood vessels, the gastrointestinal tract, the bladder, or the uterus. Its structure differs greatly from that of skeletal muscle, although it can develop isometric force per cross-sectional area that is equal to that of skeletal muscle. However, the speed of smooth muscle contraction is only a small fraction of that of skeletal muscle. (from Univ Illinois)

University of Michigan Virtual Microscopy (link)

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Anatomia Humani Corporis, Centum & Quinque Tabulis – Govard Bidloo, 1685

Image from lebody tumblr (link)

Amsterdam, 1690. Copperplate engraving with etching. 

Govard Bidloo

Gérard de Lairesse

Bidloo’s anatomy represents a transitional stage. Alongside harshly realistic illustrations, he offers a few memento mori

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