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Histomorphologic changes in expanded skeletal muscle in rats

K H Kim¹, C Hong, J W Futrell

¹Division of Plastic and Reconstructive Surgery, University of Pittsburgh School of Medicine, Pa.

Plastic and Reconstructive Surgery

|September 1, 1993

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Tissue expansion in rats promotes skeletal muscle growth, not just stretching. Expanded muscle shows increased sarcomeres per fiber, maintaining normal structure and vasculature.

Area of Science:

Regenerative Medicine
Skeletal Muscle Biology
Tissue Engineering

Background:

Tissue expansion is crucial for reconstructive surgery, providing local tissue.
The effects of tissue expansion on skeletal muscle characteristics are not well understood.

Purpose of the Study:

To investigate the histomorphologic changes in skeletal muscle following tissue expansion.
To determine if expansion induces muscle growth or simple stretching.

Main Methods:

Rat gracilis muscle expansion over 3 weeks.
Histomorphologic analysis of expanded muscle.
Assessment of muscle fiber size, vasculature, and sarcomere number.

Main Results:

Expanded muscle increased in length and width, decreasing in thickness.

Related Experiment Videos

Histology revealed normal striations without inflammation or necrosis.

Predominantly smaller muscle fibers, enhanced vasculature, and a 46.5% increase in sarcomeres per fiber were observed.

Conclusions:

Skeletal muscle expansion is a growth process, increasing sarcomeres per fiber.
Expanded muscle retains normal architecture, vasculature, and function despite ischemic stress.