Somitic origin of the medial border of the mammalian scapula and its homology to the avian scapula blade.

Journal of Anatomy
Petr ValasekKetan Patel

Abstract

The scapula is the main skeletal element of the pectoral girdle allowing muscular fixation of the forelimb to the axial skeleton. The vertebrate limb skeleton has traditionally been considered to develop from the lateral plate mesoderm, whereas the musculature originates from the axial somites. However, in birds, the scapular blade has been shown to develop from the somites. We investigated whether a somitic contribution was also present in the mammalian scapula. Using genetic lineage-tracing techniques, we show that the medial border of the mammalian scapula develops from somitic cells. The medial scapula border serves as the attachment site of girdle muscles (serratus anterior, rhomboidei and levator scapulae). We show that the development of these muscles is independent of the mechanism that controls the formation of all other limb muscles. We suggest that these muscles be specifically referred to as medial girdle muscles. Our results establish the avian scapular blade and medial border of the mammalian scapula as homologous structures as they share the same developmental origin.

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Citations

Dec 2, 2011·Anatomical Science International·Hiroshi NagashimaShigeru Kuratani
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Feb 28, 2013·Child's Nervous System : ChNS : Official Journal of the International Society for Pediatric Neurosurgery·J van AalstE M J Cornips
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Jul 12, 2011·Developmental Biology·Petr ValasekKetan Patel
Apr 30, 2011·Developmental Biology·Rebecca M ShearmanAnn C Burke
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Apr 30, 2021·Development·Lauren BobzinAmy E Merrill

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