Cardiac muscle                                    Chart

         
Cell types: Muscle cell (myocyte)
 

Differential diagnosis:
Other muscle types such as smooth muscles do not have striations. Be careful! Striations are only seen in longitudinal sections and not transverse sections as in skeletal muscles but transverse sections present no syncytium of fibers and have centrally placed one nucleus per fiber. Fibers are branching and are provided with intercalated discs.

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Diagnostic Features:
a. Tissue is compact (e.g. liver) since there is no visible lumen
b. Cross striations which are both transverse and longitudinal are seen in parallel running fibers representing myofibrils.
c. Striations are in form of crosses in most cases an prominent in longitudinal sections.
d. Transverse sections present with cross sectioned fibers which are then seen as dots with nuclei placed centrally rather than eccentrically as in skeletal muscle. Also transverse sections present fibers (cells) which have round rather than polygonal configuration. Cells are not syncytial.

Draw your own section here and make your diagnosis by data base selection below

 

 

 

 

 

 

 

 

 

 

 

 

 

Database selection: Practical Tissue Gross

Level 1: Select  compact
Level 2: Select muscular tissue from list of sclerous, muscular, connective, organ-glands and nervous tissues. This is due to parallel running fibers.
Level 3: Select striped since striations are seen on longitudinal sections only.
Also note lack of syncytium and the branching fibers with their intercalated discs.

Write does the various band seen such as I, A and the lines Z and H

 

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