In the human, true myocutaneous junctions of skeletal muscle fibers are limited to the face. Issue 2 (27th February 2021)

• Record Type: Journal Article
• Authors: May, Christian Albrecht; Bramke, Silvia
• Is Part Of: Journal of anatomy. Volume 239:Issue 2(2021)
• Page Start: 445
• Page End: 450
• Publication Date: 2021-02-27
• Subjects: insertion -- mimic muscles -- skin -- striated muscle; Anatomy -- Periodicals; 571.3
• DOI: 10.1111/joa.13419
• Languages: English
• ISSNs: 0021-8782

Abstract

Abstract: Within the panniculus carnosus‐associated skeletal muscles in the human, the palmaris brevis and the platysma showed myotendinous/myofascial junctions with clear distance to the corium and the specific connection collagen type XXII. The orbicularis oris muscle, in contrast, contained bundles of striated muscle fibers reaching the corium at two distinct levels: the predominant inner ending was connected to the elastic network of the inner corium and the outer ending was within the more superficial collagen network. At both locations, the striated muscle fibers showed brush‐like cytoplasmic protrusions connecting a network which was not oriented toward the muscle fibers. Collagen type XXII was not present. Abstract : While palmaris brevis and platysma muscles show true myotendinous junctions, the orbicularis oris muscle develops mimic muscle‐specific myocutaneous junctions. They insert brush like into the dermis and do not contain collagen XXII.