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Lecture 12

Lecture 12. Cardiac Muscle Histology (MLHS-201). Dr. Afaf Mousaad Department of Medical Laboratory Technology Faculty of Allied Medical Sciences. OBJECTIVES: By the end of this lecture students will be able to: -Name and identify the distinctive features of cardiac muscle.

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Lecture 12

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  1. Lecture 12 Cardiac Muscle Histology (MLHS-201) • Dr. AfafMousaad • Department of Medical Laboratory Technology • Faculty of Allied Medical Sciences

  2. OBJECTIVES: • By the end of this lecture students will be able to: • -Name and identify the distinctive features of cardiac muscle. • -Identify the structure of the heart wall • Recognize the differnces between skeletal and cardiac muscles.

  3. Cardiac Muscle • The myocardium, consists of muscle cells, with one centrally placed oval nucleus. • Exhibit crisscross-striations. The contraction is involuntary, strong, and rhythmical .

  4. Cardiac muscle cells • branched and joined • to one another via • intercalated discs.

  5. Intercalated discs contain several junctions. • Abundant mitochondria. • SR is less abundant than in skeletal muscle.

  6. cardiac muscles are short, the striations are not so obvious, the sarcolemma is thinner and not clearly discernible.

  7. Some cardiac cells are self-excitable. • Impulses from the SA node spread rapidly through the walls of the artria. • The impulses are spreading to the wall of the ventricles to contract.

  8. Within intercalated discs there are 3 types of junctions: Adherens junctions – Desmosomes-Gap junctions.

  9. Questions: 1.The myocardium is made of: dense connective tissue.skeletal muscle.smooth muscle.cardiac muscle.endothelium. 2.What are the features of cardiac muscle?

  10. Assignments

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