Serotonergic Modulation of Crayfish Hindgut

Musolf, Barbara E.; Spitzer, Nadja; Antonsen, Brian L.; Edwards, Donald H.

doi:10.1086/bblv217n1p50

Cited by 5 publications

(2 citation statements)

References 37 publications

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“…The long hindgut is divided into five distinct segments according to anatomical differences (Musolf et al, 2009) as shown in Fig. S4 and Pl-TEP expression pattern in different parts of crayfish digestive organs was then determined.…”

Section: Tissue Distribution Of Pl-a2m1 Pl-a2m2 and Pl-tep Mrnamentioning

confidence: 99%

An insect TEP in a crustacean is specific for cuticular tissues and involved in intestinal defense

Noonin

Jiravanichpaisal

et al. 2012

Insect Biochemistry and Molecular Biology

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Section: Tissue Distribution Of Pl-a2m1 Pl-a2m2 and Pl-tep Mrnamentioning

confidence: 99%

An insect TEP in a crustacean is specific for cuticular tissues and involved in intestinal defense

Noonin

Jiravanichpaisal

et al. 2012

Insect Biochemistry and Molecular Biology

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“…The most recent comprehensive overview of the crayfish hindgut was complied in a dissertation by Dr. Barbara E. Musolf (2007, Georgia State University, Atlanta, Georgia, USA), who focused primarily on serotonergic modulation and innervation (Musolf et al, 2009). Crustacean hindguts were first studied over 100 years ago by Alexandrowicz, a pioneer in comparative anatomy (Alexandrowicz, 1909), who described the various aspects of their innervation.…”

Section: Introductionmentioning

confidence: 99%

Physiological Experimentation with the Crayfish Hindgut: A Student Laboratory Exercise

Cooper¹,

Leksrisawat²,

Gilberts³

et al. 2011

JoVE

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The purpose of the report is to describe dissection techniques for preparing the crayfish hindgut and to demonstrate how to make physiological recordings with a force transducer to monitor the strength of contraction. In addition, we demonstrate how to visually monitor peristaltic activity, which can be used as a bioassay for various peptides, biogenic amines and neurotransmitters. This preparation is amenable to student laboratories in physiology and for demonstrating pharmacological concepts to students. This preparation has been in use for over 100 years, and it still offers much as a model for investigating the generation and regulation of peristaltic rhythms and for describing the mechanisms underlying their modulation. The pharmacological assays and receptor sub-typing that were started over 50 years ago on the hindgut still contribute to research today. This robust preparation is well suited to training students in physiology and pharmacology.

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A review of gastric processing in decapod crustaceans

2012

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This article reviews the mechanical processes associated with digestion in decapod crustaceans. The decapod crustacean gut is essentially an internal tube that is divided into three functional areas, the foregut, midgut, and hindgut. The foregut houses the gastric mill apparatus which functions in mastication (cutting and grinding) of the ingested food. The processed food passes into the pyloric region of the foregut which controls movement of digesta into the midgut region and hepatopancreas where intracellular digestion takes place. The movements of the foregut muscles and gastric mill are controlled via nerves from the stomatogastric ganglion. Contraction rates of the gastric mill and foregut muscles can be influenced by environmental factors such as salinity, temperature, and oxygen levels. Gut contraction rates depend on the magnitude of the environmental perturbation and the physiological ability of each species. The subsequent transit of the digesta from the foregut into the midgut and through the hindgut has been followed in a wide variety of crustaceans. Transit rates are commonly used as a measure of food processing rates and are keys in understanding strategies of adaptation to trophic conditions. Transit times vary from as little as 30 min in small copepods to over 150 h in larger lobsters. Transit times can be influenced by the size and the type of the meal, the size and activity level of an animal and changes in environmental temperature, salinity and oxygen tension. Ultimately, changes in transit times influence digestive efficiency (the amount of nutrients absorbed across the gut wall). Digestive efficiencies tend to be high for carnivorous crustaceans, but somewhat lower for those that consume plant material. A slowing of the transit rate allows more time for nutrient absorption but this may be confounded by changes in the environment, which may reduce the energy available for active transport processes. Given the large number of articles already published on the stomatogastric ganglion and its control mechanisms, this area will continue to be of interest to scientists. There is also a push towards studying animals in a more natural environment or even in the field and investigation of the energetic costs of the components of digestion under varying biotic and environmental conditions will undoubtedly be an area that expands in the future.

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Serotonergic Modulation of Crayfish Hindgut

Cited by 5 publications

References 37 publications

An insect TEP in a crustacean is specific for cuticular tissues and involved in intestinal defense

An insect TEP in a crustacean is specific for cuticular tissues and involved in intestinal defense

Physiological Experimentation with the Crayfish Hindgut: A Student Laboratory Exercise

A review of gastric processing in decapod crustaceans

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