scholarly journals Distinct modes of vertebrate hypaxial muscle formation contribute to the teleost body wall musculature

2011 ◽  
Vol 221 (3) ◽  
pp. 167-178 ◽  
Author(s):  
Stefanie E. Windner ◽  
Peter Steinbacher ◽  
Astrid Obermayer ◽  
Barna Kasiba ◽  
Josef Zweimueller-Mayer ◽  
...  
Keyword(s):  
Body Wall ◽  
Muscle Formation ◽  
Body Wall Musculature ◽  
Hypaxial Muscle

Comparative body wall musculature and muscle fibre ultrastructure in branchiobdellidans (Annelida: Clitellata), and their phylogenetic significance

Hydrobiologia ◽  
1994 ◽  
Vol 278 (1-3) ◽  
pp. 189-199 ◽  
Author(s):  
Roberto Valvassori ◽  
Magda de Eguileor ◽  
Giulio Lanzavecchia ◽  
Stuart R. Gelde
Keyword(s):  
Muscle Fibre ◽  
Body Wall ◽  
Phylogenetic Significance ◽  
Body Wall Musculature

The evolution of air-breathing respiratory faculties in craniotes

2019 ◽  
pp. 177-191
Author(s):  
Steven F. Perry ◽  
Markus Lambertz ◽  
Anke Schmitz
Keyword(s):  
High Performance ◽  
Body Wall ◽  
Structure And Function ◽  
Control Of Breathing ◽  
Body Wall Muscle ◽  
Positive Pressure ◽  
Limiting Factor ◽  
Swim Bladder ◽  
Body Wall Musculature ◽  
And Function

The origin of lungs from a swim bladder, swim bladder from lungs, or both from a relatively undifferentiated respiratory pharynx remains unresolved. Once present, the lungs can be ventilated by a positive-pressure buccal pump, which can be easily derived from the gill ventilation sequence in a lungfish, or by negative-pressure aspiration. Although aspiration breathing is characteristic of amniotes, it has also been observed in a lungfish and body wall muscle contraction in response to respiratory stimuli has even been reported in lamprey larvae. The hypaxial body wall musculature used for aspiration breathing is also necessary for locomotion in most amniotes, just when respiratory demand is greatest. This paradox, called Carrier’s constraint, is a major limiting factor in the evolution of high-performance faculties, and the evolution of anatomical and physiological specializations that circumvent it characterize most major amniote groups. Serendipitous combinations have resulted in evolutionary cascades and high-performance groups such as birds and mammals. Complementing evolution are the capacities for acclimatization and adaptation not only in the structure and function of the gas exchanger, but also in the control of breathing and the composition of the blood.

scholarly journals A role for adenosine in metabolic depression in the marine invertebrate Sipunculus nudus

1997 ◽  
Vol 272 (1) ◽  
pp. R350-R356 ◽  
Author(s):  
A. Reipschlager ◽  
G. E. Nilsson ◽  
H. O. Portner
Keyword(s):  
Body Wall ◽  
Marine Invertebrate ◽  
Coelomic Fluid ◽  
Metabolic Depression ◽  
O2 Consumption ◽  
Experimental Conditions ◽  
Indwelling Catheter ◽  
Sipunculus Nudus ◽  
Body Wall Musculature ◽  
Concentration Changes

Involvement of neurotransmitters in metabolic depression under hypoxia and hypercapnia was examined in Sipunculus nudus. Concentration changes of several putative neurotransmitters in nervous tissue during anoxic or hypercapnic exposure or during combined anoxia and hypercapnia were determined. Among amino acids (gamma-aminobutyric acid, glutamate, glycine, taurine, serine, and aspartate) and monoamines (serotonin, dopamine, and norepinephrine), some changes were significant, but none were consistent with metabolic depression under all experimental conditions applied. Only the neuromodulator adenosine displayed concentration changes in accordance with metabolic depression under all experimental conditions. Levels increased during anoxia, during hypercapnia, and to an even greater extent during anoxic hypercapnia. Adenosine infusions into coelomic fluid via an indwelling catheter induced a significant depression of the normocapnic rate of O2 consumption from 0.36 +/- 0.04 to a minimum of 0.24 +/- 0.02 (SE) mumol.g-1.h-1 after 90 min (n = 6). Application of the adenosine antagonist theophylline caused a transient rise in O2 consumption 30 min after infusion during hypercapnia but not during normocapnia. Effects of adenosine and theophylline were observed in intact individuals but not in isolated body wall musculature. The results provide evidence for a role of adenosine in inducing metabolic depression in S. nudus, probably through the established effects of decreasing neuronal excitability and neurotransmitter release. In consideration of our previous finding that metabolic depression in isolated body wall musculature was elicited by extracellular acidosis, it is concluded that central and cellular mechanisms combine to contribute to the overall reduction in metabolic rate in S. nudus.

scholarly journals The Fine Structure of Some Blood Vessels of the Earthworm, Eisenia foetida

1960 ◽  
Vol 7 (4) ◽  
pp. 717-724 ◽  
Author(s):  
Kiyoshi Hama
Keyword(s):  
Fine Structure ◽  
Basement Membrane ◽  
Body Wall ◽  
Circular Muscle ◽  
Muscle Layer ◽  
Eisenia Foetida ◽  
Longitudinal Muscle Layer ◽  
Cell Processes ◽  
Body Wall Musculature ◽  
Blood Pigment

The fine structure of the main dorsal and ventral circulatory trunks and of the subneural vessels and capillaries of the ventral nerve cord of the earthworm, Eisenia foetida, has been studied with the electron microscope. All of these vessels are lined internally by a continuous extracellular basement membrane varying in thickness (0.03 to 1 µ) with the vessel involved. The dorsal, ventral, and subneural vessels display inside this membrane scattered flattened macrophagic or leucocytic cells called amebocytes. These lie against the inner lining of the basement membrane, covering only a small fraction of its surface. They have long, attenuated branching cell processes. All of these vessels are lined with a continuous layer of unfenestrated endothelial cells displaying myofilaments and hence qualifying for the designation of "myoendothelial cells." The degree of muscular specialization varies over a spectrum, however, ranging from a delicate endowment of thin myofilaments in the capillary myoendothelial cells to highly specialized myoendothelial cells in the main pulsating dorsal blood trunk, which serves as the worm's "heart" or propulsive "aorta." The myoendothelial cells most specialized for contraction display well organized sarcoplasmic reticulum and myofibrils with thick and thin myofilaments resembling those of the earthworm body wall musculature. In the ventral circulatory trunk, circular and longitudinal myofilaments are found in each myoendothelial cell. In the dorsal trunk, the lining myoendothelial cells contain longitudinal myofilaments. Outside these cells are circular muscle cells. The lateral parts of the dorsal vessels have an additional outer longitudinal muscle layer. The blood plasma inside all of the vessels shows scattered particles representing the circulating earthworm blood pigment, erythrocruorin.

scholarly journals The Blood-system in the Serpulimorpha (Annelida, Polychaeta)

1950 ◽  
Vol s3-91 (16) ◽  
pp. 369-378
Author(s):  
JEAN HANSON
Keyword(s):  
Blood Supply ◽  
Peripheral Blood ◽  
Body Wall ◽  
Blood System ◽  
The Body ◽  
Dorsal Vessel ◽  
The Family ◽  
Body Wall Musculature

1. The blood-system in sabellids of the following genera is described: Sabella, Potamilla, Branchiomma, Dasychone, Amphiglena, Fabricia, Jasmineira, Dialychone, and Myxicola. 2. The central blood-system of Sabella is typical of the family, but the peripheral blood-system is variable. 3. The dorsal vessel lacks the valve and muscular sphincter found in some serpulids. 4. Lateral vessels are present only in Sabella and Dasychone. 5. The differences and similarities between sabellid and serpulid blood-systems are discussed. Special attention is given to the functions of sub-epidermal and coelomic capillaries and the blood-supply of the body-wall musculature.

scholarly journals A genetic screen for regulators of muscle morphogenesis in Drosophila

2021 ◽  
Author(s):  
Aaron N Johnson ◽  
James B Skeath ◽  
Tiffany Ou ◽  
Beth Wilson ◽  
Paul Gontarz ◽  
...  
Keyword(s):  
Skeletal Muscles ◽  
Body Wall ◽  
Screening Strategy ◽  
Genetic Screen ◽  
Muscle Size ◽  
Forward Genetic Screen ◽  
Attachment Sites ◽  
Body Wall Musculature ◽  
New Alleles ◽  
Muscle Attachment Sites

The mechanisms that determine the final topology of skeletal muscles remain largely unknown. We have been developing Drosophila body wall musculature as a model to identify and characterize the pathways that control muscle size, shape, and orientation during embryogenesis (Johnson et al., 2013; Williams et al., 2015; Yang et al., 2020a; Yang et al., 2020b). Our working model argues muscle morphogenesis is regulated by (1) extracellular guidance cues that direct muscle cells toward muscle attachment sites, and (2) contact dependent interactions between muscles and tendons. While we have identified several pathways that regulate muscle morphogenesis, our understanding is far from complete. Here we report the results of a recent EMS-based forward genetic screen that identified a myriad of loci not previously associated with muscle morphogenesis. We recovered new alleles of known muscle morphogenesis genes, including bsd, kon, ths, and tum, arguing our screening strategy was effective and efficient. We also identified and sequenced new alleles of salm, barr, and ptc that presumably disrupt independent pathways directing muscle morphogenesis. Equally as important, our screen shows that at least 11 morphogenetic loci remain to be identified. This screen has developed exciting new tools to study muscle morphogenesis, which may provide future insights into the mechanisms that determine skeletal muscle topology.

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