Related Experiment Video

Updated: Jul 3, 2026

Fundamental Technical Elements of Freeze-fracture/Freeze-etch in Biological Electron Microscopy
11:17

Fundamental Technical Elements of Freeze-fracture/Freeze-etch in Biological Electron Microscopy

Published on: September 11, 2014

Membrane systems of freeze-etched striated muscle

D S Smith1, H C Aldrich

  • 1Papanicolaou Cancer Research Institute and Deparment of Medicine, University of Miami, Miami, Florida, USA.

Tissue & Cell
|January 1, 1971
PubMed

Insights

This study details dragonfly flight muscle structure using advanced freeze-etching techniques. It reveals intricate details of the plasma membrane and sarcoplasmic reticulum, crucial for muscle function.

Area of Science:

  • Muscle physiology
  • Cell biology
  • Insect anatomy

Background:

  • Dragonfly flight muscles are highly specialized for powerful and rapid contractions.
  • Understanding the ultrastructure of muscle cells is key to explaining their function.

Purpose of the Study:

  • To investigate the organization of dragonfly flight muscle fibre membrane systems.
  • To describe the plasma membrane, transverse tubules, and sarcoplasmic reticulum in detail.

Main Methods:

  • Utilized freeze-etching and platinum-carbon replica techniques.
  • Examined fractured and unfractured membrane surfaces using electron microscopy.
  • Created stereo-micrographs for detailed visualization.

Main Results:

  • Described the origin and radial course of transverse tubules within the muscle cell.
  • Detailed the relationship between tubules and mitochondrial surface grooves.
  • Characterized the form of sarcoplasmic reticulum cisternae.
  • Observed multiple unfractured membrane surfaces and fractured profiles.

Conclusions:

  • The study provides a high-resolution ultrastructural analysis of dragonfly flight muscle.
  • The findings enhance understanding of the membrane systems involved in muscle excitation-contraction coupling.
  • Advanced imaging techniques offer new insights into cellular architecture.

More Related Videos

Intact Short, Intermediate, and Long Skeletal Muscle Fibers Obtained by Enzymatic Dissociation of Six Hindlimb Muscles of Mice: Beyond Flexor Digitorum Brevis08:12

Intact Short, Intermediate, and Long Skeletal Muscle Fibers Obtained by Enzymatic Dissociation of Six Hindlimb Muscles of Mice: Beyond Flexor Digitorum Brevis

Published on: December 1, 2023

Fiber Type and Subcellular-Specific Analysis of Lipid Droplet Content in Skeletal Muscle11:50

Fiber Type and Subcellular-Specific Analysis of Lipid Droplet Content in Skeletal Muscle

Published on: June 8, 2022

Related Concept Videos

Microscopic Anatomy of Skeletal Muscles01:13

Microscopic Anatomy of Skeletal Muscles

Skeletal muscle cells, also called muscle fibers, are distinctly elongated, multi-nucleated, slender biological units. They are packed with specialized structures designed to facilitate their primary function, which is contraction.
The muscle sarcolemma is a plasma membrane enclosing each muscle cell that conducts electrical signals called action potentials. The sarcolemma extends into the cell to form T-tubules, ensuring the neural impulses are uniformly distributed across the entire muscle...
Overview of Skeletal Muscle01:15

Overview of Skeletal Muscle

Skeletal muscles are composed of a bundle of muscle fibers and are attached to bones through tendons. Each skeletal muscle fiber is a single muscle cell. The sarcolemma, the plasma membrane of a skeletal muscle cell, consists of a lipid bilayer and glycocalyx that supports muscle fibers. The sarcolemma extends into the muscle cells to form tubular structures called transverse or T-tubules. Each side of the T-tubules consists of a membrane-bound structure called the sarcoplasmic reticulum,...
Skeletal Muscle Anatomy00:55

Skeletal Muscle Anatomy

Skeletal muscle is the most abundant type of muscle in the body. Tendons are the connective tissue that attaches skeletal muscle to bones. Skeletal muscles pull on tendons, which in turn pull on bones to carry out voluntary movements.
Actin and Myosin in Muscle Contraction01:16

Actin and Myosin in Muscle Contraction

Actin and myosin are contractile proteins that form the sarcomere found in skeletal muscle tissues for regulating muscle contraction. Actin, a globular contractile protein, interacts with myosin for muscle contraction. The skeletal tissue appears striped or striated under a microscope due to the repeated arrangement of contractile proteins actin and myosin along the length of myofibrils. Dark A bands and light I bands repeat along myofibrils, and the alignment of myofibrils in the cell causes...