Die Frühentwicklung des Schultergürtels und des Brustbeins bei den Monotremen (Mammalia: Prototheria)

Klima, Milan

doi:10.1007/978-3-662-06649-2

Cited by 16 publications

(33 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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“…Because of its topographic relations (dorsal to the clavicle) and its ossification mode, it is unparsimonious to homologize the scapular spine with the cleithrum. Klima (1973) also found no traces of this element in the development of the monotreme shoulder girdle-nor did many researchers in a variety of mammaliamorph taxa (Rowe, 1988;Luo et al, 2001).…”

Section: Developmental Data and The Origin Of The Therian Scapular Spinementioning

confidence: 90%

“…Later on in development, by the end of the period of fixation, the first rib has attained a more standard shape and size relative to other structures and no longer provides an articular surface to the humerus. Klima (1973) showed that in monotremes the coracoid cartilages of both sides do not fuse with each other in the midline nor with the sternum. Therefore, it seems likely that the loose connection between sternum and ribs on one side, and the coracoids on the other, may be a symplesiomorphic trait.…”

Section: Breast-shoulder Arch Of Marsupials At Birth; Comparisons Witmentioning

confidence: 98%

“…As documented in several studies on monotremes (Klima, 1973), marsupials (Klima, 1987), and eutherians (Gro␤mann et. al., 2002, and references therein), the ontogeny of the mammalian and therian pectoral girdle shows similar transformations to those that occurred during its evolutionary origin.…”

mentioning

confidence: 92%

“…The terminology used in this work is that of Klima (1973Klima ( , 1987, who provided a thorough review of the literature in this regard and who is followed by most recent authors concerned with the therian pectoral girdle (Hu et al, 1997;Ji et al, 1999;Luo et al, 2001). The anterior coracoid or procoracoid of basal amniotes and basal synapsids (Romer, 1922) is in adult therians either absent or, according to Klima (1987), present as the small praeclavium or ossa suprasternalia.…”

mentioning

confidence: 98%

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Ontogenesis of the scapula in marsupial mammals, with special emphasis on perinatal stages of didelphids and remarks on the origin of the therian scapula

Sánchez‐Villagra

Maier

2003

Journal of Morphology

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The development of the scapula was studied in embryonic and postnatal specimens of Monodelphis domestica and perinatal specimens of Philander opossum, Caluromys philander, and Sminthopsis virginiae using histological sections and 3D reconstructions. Additionally, macerated skeletons of postnatal M. domestica were examined. This study focused on the detachment of the scapulocoracoid from the sternum and on the acquisition of a supraspinous fossa, a supraspinatus muscle, and a scapular spine, all these events associated with the origin of the therian shoulder girdle. In none of the specimens is there a continuity of the cartilaginous scapulocoracoid with the sternum, even though the structures are in close proximity, especially in S. virginiae. At birth, the first rib laterally presents a pronounced boss that probably contacts the humerus during certain movements. Only the acromial portion of the scapular spine, which originates from the anterior margin of the scapular blade, is preformed in cartilage. The other portion is formed by appositional bone ("Zuwachsknochen"), which expands from the perichondral ossification of the scapula into an intermuscular aponeurosis between the supra- and infraspinous muscles. This intermuscular aponeurosis inserts more or less in the middle of the lateral surface of the developing scapula. Thus, the floor of the supraspinous fossa is present from the beginning of scapular development, simultaneously with the infraspinous fossa. The homology of the therian spine with the anterior border of the sauropsid and monotreme scapula is questioned. We consider the dorsal portion (as opposed to the ventral or acromial portion) of the scapular spine a neomorphic structure of therian mammals.

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Ontogenetic data and the evolutionary origin of the mammalian scapula

Sánchez‐Villagra

Maier

2002

Naturwissenschaften

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One of the most useful diagnostic therian features is the division of the lateral surface of the scapula into two fossae separated by a scapular spine. A new model to describe this evolutionary innovation based on ontogenetic data is provided, consistent with information provided by recent fossil discoveries. The development of the scapula in three didelphid and one dasyurid marsupials using histological sections was studied. Only the ventral, acromial portion of the scapular spine, which originates from the anterior margin of the scapular blade, is preformed in cartilage. The major dorsal portion is formed at a later stage by appositional bone, which expands from the perichondral ossification of the scapula into an intermuscular aponeurosis between the supra-and infraspinatus muscles. This intermuscular aponeurosis inserts more or less in the middle of the lateral surface of the developing scapula. Thus, the floor of the supraspinous fossa is already present at the beginning of scapular development, simultaneous with the infraspinous fossa. The portion of the scapular spine that is situated dorsal to the acromial process is hypothesized to be a neomorphic structure of therians. The dorsal portion of the scapular spine evolved as additional attachment for powerful supraspinatus and infraspinatus muscles meeting near the middle of the lateral scapula.

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Die Frühentwicklung des Schultergürtels und des Brustbeins bei den Monotremen (Mammalia: Prototheria)

Cited by 16 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

Ontogenesis of the scapula in marsupial mammals, with special emphasis on perinatal stages of didelphids and remarks on the origin of the therian scapula

Ontogenetic data and the evolutionary origin of the mammalian scapula

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