Early Development of the Shoulder Girdle and Sternum in Marsupials (Mammalia: Metatheria)

Klima, Milan

doi:10.1007/978-3-642-72994-2

Cited by 49 publications

(98 citation statements)

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“…Hanson (1919) restated the concept of sternal bands as formulated by Rathke. The more recent studies have confirmed the concept as developed by Rathke (Gladston and Wakeley, 1932;Chen, 1952aChen, ,b, 1953Bryson, 1945;Klima, 1968Klima, , 1973Klima, , 1987. The present extension of this concept to the abdomen would provide a similar method of closure of both the ventral thoracic and abdominal walls.…”

Section: Discussionsupporting

confidence: 82%

Differentiation of the anterior body wall and truncal epidermis and associated co‐migration of cutaneous nerves and mesenchyme

Munger

1991

Anat. Rec.

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The present study examines the relationship between the migration of mesenchyme and associated cutaneous nerves that are involved in the closure of the anterior body wall in embryonic mice and rats by light and electron microscopy. The sternum is formed by the migration of condensations of mesenchyme originating in the dorsolateral body wall known as sternal bands. In the course of analyzing this process in rodent embryos we have identified similar paired caudal extensions of the sternal bands that are responsible for the closure of the abdominal wall following resolution of the umbilical hernia, and we suggest these bands of mesoderm should be referred to as the abdominal bands. Both the sternal and abdominal bands are associated with the development of the segmental spinal nerves and their cutaneous terminal branches. The first cutaneous nerve to reach the skin surface in rats is the later cutaneous nerve (PCN and ACN) at E13.5 days. The ACN co-migrates with the sternal and abdominal bands, and terminal branches of axons from the ACN approach the epidermis during this migration. Differentiation of the epidermis could be recognized as a change in shape of epidermal cells from squamous to cuboidal, and this initial differentiation coincides with the onset of cutaneous innervation, beginning at the site of the LCN and following the extent of innervation of the PCN as well as the migration of the mesodermal bands and associated ACN. The paired ACN's meet in the ventral midline at E16.5 in rats as the sternal bands fuse, and terminal axons from both nerves densely innervate the midline skin.(ABSTRACT TRUNCATED AT 250 WORDS)

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Section: Discussionsupporting

confidence: 82%

Differentiation of the anterior body wall and truncal epidermis and associated co‐migration of cutaneous nerves and mesenchyme

Munger

1991

Anat. Rec.

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“…It has long been recognized that, relative to eutherians, marsupials accelerate the development of certain structures such as the tongue, the bones around the oral apparatus, and the bones and muscles of the forelimb (e.g., Hill and Hill, 1955;Lee and Cockburn, 1985;Klima, 1987;Maier, 1987Maier, , 1993Maier, , 1999Tyndale-Biscoe and Renfree, 1987;Hughes and Hall, 1988;Nelson, 1988;Cockburn, 1989;Filan, 1991;Clark and Smith, 1993;Gemmell and Selwood, 1994, and references therein). This advancement is interpreted as an adaptive response to the functional requirements placed on the neonate by the marsupial life history.…”

Section: Evolution Of Development In Mammalsmentioning

confidence: 99%

Sequence Heterochrony and the Evolution of Development

Smith

2002

Journal of Morphology

113

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One of the most persistent questions in comparative developmental biology concerns whether there are general rules by which ontogeny and phylogeny are related. Answering this question requires conceptual and analytic approaches that allow biologists to examine a wide range of developmental events in well-structured phylogenetic contexts. For evolutionary biologists, one of the most dominant approaches to comparative developmental biology has centered around the concept of heterochrony. However, in recent years the focus of studies of heterochrony largely has been limited to one aspect, changes in size and shape. I argue that this focus has restricted the kinds of questions that have been asked about the patterns of developmental change in phylogeny, which has narrowed our ability to address some of the most fundamental questions about development and evolution. Here I contrast the approaches of growth heterochrony with a broader view of heterochrony that concentrates on changes in developmental sequence. I discuss a general approach to sequence heterochrony and summarize newly emerging methods to analyze a variety of kinds of developmental change in explicit phylogenetic contexts. Finally, I summarize a series of studies on the evolution of development in mammals that use these new approaches.

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“…13). In all didelphids, the first rib is short and robust since it is subject to tension forces, and it develops an especially strong connection with the manubrium (Klima, 1987). Some important muscles, such as Mm.…”

Section: Ribs and Sternummentioning

confidence: 99%

“…Although the study of the postcranial morphology in metatherians has received notable attention, most of it was focused on functional, ontogenetic, and descriptive frames, but not phylogenetics (e.g., Coues, 1869;Flower, 1885;Elftman, 1929;Barnett and Napier, 1953;Mann-Fischer, 1953;Jenkins and Weijs, 1979;Klima, 1987;White, 1990;Pridmore, 1992;Marshall and Sigogneau-Russell, 1995;Lunde and Schutt, 1999;Argot, 2001Argot, , 2002Argot, , 2003aArgot, , 2003bArgot, , 2004aArgot, , 2004bMartin and Mackay, 2003;Muizon and Argot, 2003; but see Szalay, 1994;Szalay and Sargis, 2001;Horovitz and Sá nchezVillagra, 2003). The study of Horovitz and Sá nchez-Villagra (2003) contains numerous postcranial characters treated in high-level taxonomic categories that are interpreted in a cladistic context.…”

Section: Introductionmentioning

confidence: 99%

Phylogenetic Analyses of Postcranial Skeletal Morphology in Didelphid Marsupials

Flores¹

2009

Bulletin of the American Museum of Natural History

120

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Early Development of the Shoulder Girdle and Sternum in Marsupials (Mammalia: Metatheria)

Cited by 49 publications

References 0 publications

Differentiation of the anterior body wall and truncal epidermis and associated co‐migration of cutaneous nerves and mesenchyme

Differentiation of the anterior body wall and truncal epidermis and associated co‐migration of cutaneous nerves and mesenchyme

Sequence Heterochrony and the Evolution of Development

Phylogenetic Analyses of Postcranial Skeletal Morphology in Didelphid Marsupials

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