Back to Blog

Tangential Sections Through Three Triads

Kelly Mrachek, MD
By Kelly Mrachek, MD

Jan 01, 2021

Tangential Sections Through Three Triads

Can you identify the structure(s) identified by arrows in this muscle biopsy?

 

Tangential sections through three triads (pale T-tubules and darker adjacent sarcoplasmic reticulum ….. “Oreo cookie-like”) in association with sarcomeres (electron microscopy 15000x magnification).

T-tubules distribute the surface action potential into the interior of the muscle fiber, where it triggers release of calcium stored in the adjacent sarcoplasmic reticulum (i.e. excitation-contraction coupling).  Release and reuptake of calcium by the sarcoplasmic reticulum is critical to muscle contraction and relaxation.  Note the location of the triads adjacent to thick filaments where calcium is utilized for contraction. 

Tags:

Quick note: This post is to be used for informational purposes only and does not constitute medical or health advice. Each person should consult their own doctor with respect to matters referenced. Arkana Laboratories assumes no liability for actions taken in reliance upon the information contained herein.