The internal anatomy of the woodlouse, Metoponorthus pruinosus (Brandt), (Porcellionidae, Peracarida)

1968 ◽  
Vol 46 (3) ◽  
pp. 321-327 ◽  
Author(s):  
M. A. Alikhan
Keyword(s):  
Nervous System ◽  
Digestive System ◽  
Circulatory System ◽  
Reproductive Organs ◽  
The Body ◽  
Internal Anatomy ◽  
Suboesophageal Ganglion ◽  
Digestive Tube ◽  
Thoracic Ganglia ◽  
Digestive Glands

Tbe circulatory system, lying in the mid-dorsal line of the body, consists of an oval heart, the opthalmic artery, and a dorsal abdominal artery.The digestive system comprises a wide, large alimentary tube and two pairs of digestive glands. An oesophagus, a proventriculus, midgut, and a short proctodacum or hindgut form the digestive tube. The digestive glands are very well developed and are beaded in form; each pair lies on either side of the alimentary canal.The reproductive organs are well developed in both sexes: in the male they consist of paired testes and their vas deferentia, and in the female paired bilobed ovaries and oviducts.A cerebral or supraoesophageal ganglion, a suboesophageal ganglion, and seven thoracic ganglia form the nervous system. The supraoesophageal ganglion is united with the suboesophageal ganglion by means of the circumoesophageal commissures, whereas the thoracic ganglia and suboesophageal ganglia are linked with each other by paired connectives.The gills and the tracheae are the organs of respiration. The gills are borne of the bases of the pleopods and are enclosed in the branchial chamber. The tracheae are located on the lateral lobes of the first two pleopods only.

Organogenesis

2020 ◽  
pp. 80-112
Author(s):  
Günther Loose ◽  
Günter Vogt ◽  
Mireille Charmantier-Daures ◽  
Guy Charmantier ◽  
Steffen Harzsch
Keyword(s):  
Nervous System ◽  
Heart Development ◽  
Digestive System ◽  
Temporal Dynamics ◽  
Circulatory System ◽  
Reproductive Organs ◽  
Muscular Tissue ◽  
Organ Systems ◽  
Organ Specific ◽  
Mode Of Development

This chapter reviews the development of the major organ systems in crustaceans, including musculature, nervous system, circulatory system, digestive system, osmoregulatory system, excretory system, reproductive system, and sensory organs. It describes the morphological unfolding of these organ systems, which generally follows cleavage, gastrulation, and segmentation in the course of ontogeny. Particular emphasis is given to the organ-specific temporal dynamics of development, the onset of functionality, and possible correlations with developmental mode, life history, and ecology. The anatomy and cellular characteristics of developing organs are generally better investigated than aspects of physiology, biochemistry, and molecular biology. Investigations in different crustaceans revealed that the speed of development of the various organ systems varies considerably within an individual and between species. As a rule of thumb, anlagen of the nervous tissue, muscular tissue, digestive system, and excretory organs appear first, followed by the circulatory system. Osmoregulatory organs are formed later. The reproductive organs are the last to emerge and to become functional. The mode of development, behavior, and ecology of the postembryonic stages seem to be major determinants that influence the speed differences of organogenesis. This is reflected by timing differences in development of the digestive system between directly and indirectly developing representatives or species with or without lecithotrophic larvae. Other features of the dynamics of organogenesis suggest evolutionary constraints, such as the delayed development of the nervous system in postnaupliar, relative to naupliar, segments in some species. Mechanistic constraints may be involved in heart development and development of nontransitory osmoregulatory organs.

MORPHOLOGICAL STUDIES OF THE MALE NYGOLAIMUS AQUATICUS THORNE, 1930

1963 ◽  
Vol 41 (5) ◽  
pp. 725-732
Author(s):  
V. M. Das
Keyword(s):  
Nervous System ◽  
Digestive System ◽  
Reproductive Organs ◽  
The Body ◽  
Excretory System ◽  
Serial Sections ◽  
Morphological Studies ◽  
Organ Systems ◽  
Cuticular Structure ◽  
Whole Mounts

The anatomy of males of Nygolaimus aquaticus Thorne, 1930, collected from Blackburn, Ontario, is described. Descriptions are based on whole mounts and also on serial sections. Specimens embedded in paraffin were cut in sections 9 μ in thickness and stained with haematoxylin and eosin.Special emphasis is given to cuticular structure, such as median pores, lateral pores, hemizonid, and transverse and longitudinal striations, which are described and illustrated. Besides these structures, other organ systems of the body, such as digestive system, excretory system, nervous system, and reproductive organs, have also been described and illustrated.

The Co-Ordination of Insect Movements

1957 ◽  
Vol 34 (3) ◽  
pp. 306-333
Author(s):  
G. M. HUGHES
Keyword(s):  
Central Nervous System ◽  
Nervous System ◽  
The Body ◽  
The Other ◽  
Limb Amputation ◽  
Normal Movement ◽  
Thoracic Ganglia ◽  
Blatta Orientalis ◽  
The Central Nervous System ◽  
Leg Movements

I. The effects of limb amputation and the cutting of commissures on the movements of the cockroach Blatta orientalis have been investigated with the aid of cinematography. Detailed analyses of changes in posture and rhythm of leg movements are given. 2. It is shown that quite marked changes occur following the amputation of a single leg or the cutting of a single commissure between the thoracic ganglia. 3. Changes following the amputation of a single leg are immediate and are such that the support normally provided by the missing leg is taken over by the two remaining legs on that side. Compensatory movements are also found in the contralateral legs. 4. When two legs of opposite sides are amputated it has been confirmed that the diagonal sequence tends to be adopted, but this is not invariably true. Besides alterations in the rhythm which this may involve, there are again adaptive modifications in the movements of the limbs with respect to the body. 5. When both comrnissures between the meso- and metathoracic ganglia are cut, the hind pair of legs fall out of rhythm with the other four legs. The observations on the effects of cutting commissures stress the importance of intersegmental pathways in co-ordination. 6. It is shown that all modifications following the amputation of legs may be related to the altered mechanical conditions. Some of the important factors involved in normal co-ordination are discussed, and it is suggested that the altered movements would be produced by the operation of these factors under the new conditions. It is concluded that the sensory inflow to the central nervous system is of major importance in the co-ordination of normal movement.

The Post-embryonic Development of Phaenoserphus viator Hal. (Proctotrypoidea), a Parasite of the Larva of Pterostichus niger (Carabidae), with Notes on the Anatomy of the Larva

Parasitology ◽  
1929 ◽  
Vol 21 (1-2) ◽  
pp. 1-21 ◽  
Author(s):  
L. E. S. Eastham
Keyword(s):  
Body Wall ◽  
Larval Instar ◽  
Circulatory System ◽  
The Body ◽  
Suboesophageal Ganglion ◽  
Tracheal System ◽  
Single Host ◽  
History Of ◽  
Cerebral Commissures ◽  
Frontal Ganglion

1. The life-history of Phaenoserphus viator is described.Four larval instars are found, endoparasitic in the larvae of Pterostichus niger. At thee nd of the last larval instar the parasites, which may number as many as 45 in a single host, emerge, and while still attached, pupate without spinning a cocoon.Adults may appear in August or September.The effect of the parasite in inhibiting metamorphosis of the host is discussed.2. The first observed larva is atracheate and incompletely segmented at first and is of the polypod type bearing paired prolegs on the body segments.Subsequent instars are apodate.The tracheal system develops progressively in the several instars, but only becomes functional in the final stage.3. The anatomy of the larva is briefly described with the exception of the musculature.Tracheal development is described. Gas only appears in the tracheae after the development of the tracheole cells puts the tracheae into communication with the body wall and other organs.In the circulatory system an important accessory organ is the neural sinus, formed by the enclosure of the ventral nerve cord beneath a connective tissue curtain.The imaginal discs of the hypodermis are briefly described, these being clearly defined in the head, thorax, and posterior abdominal segments.The nervous system consists of a brain, suboesophageal ganglion and 11 ventral ganglia, the most posterior being tripartite. This system is connected with the sympathetic, by nerves passing from the cerebral commissures to a frontal ganglion which lies above the oesophagus and behind the labrum.

The internal anatomy of Typhlops schneider (Reptilia)

1960 ◽  
Vol 8 (2) ◽  
pp. 181 ◽  
Author(s):  
J Robb
Keyword(s):  
Connective Tissue ◽  
Reproductive Organs ◽  
Body Cavity ◽  
The Body ◽  
The Other ◽  
Internal Anatomy ◽  
Reproductive Systems ◽  
Male And Female ◽  
Connective Tissue Sheath ◽  
First Time

The internal anatomy of Typhlops shows a number of interesting features which support the hypothesis that the typhlopids are wrongly classified among the Ophidia, and that they should either be given subordinal rank, equivalent to the Sauria and the Serpentes, or be made an infra-order of the Sauria. The alimentary, vascular, respiratory, and reproductive systems are described in detail for the first time. The most striking peculiarities occur in the respiratory and reproductive systems. Unlike most snakes, Typhlops has two functional lungs, one occupying most of the anterior third of the body cavity, and the other smaller one lying immediately behind it. All the pulmonary blood vessels are well developed. The male reproductive organs are solid, grooved, protrusible structures, each of which is contained within a connective tissue sheath in the postanal region. These organs are unlike the hemipenes of any snake or lizard of which a description can be found. Both male and female animals possess a large cloaca1 gland in the postanal region. There are also several uncommon features in the alimentary and vascular systems.

Specific features of the structure of eosephagus,proventriculus and ventriculus in "Hisex Brown" chicken and Pekin duck

2019 ◽  
Vol 1 (2) ◽  
pp. 28-33
Author(s):  
Ludmila Fomenko ◽  
Daria Prasolova
Keyword(s):  
Digestive System ◽  
Structural Features ◽  
The Body ◽  
Pekin Duck ◽  
Digestive Juice ◽  
Anatomical Dissection ◽  
Inner Surface ◽  
Food Particles ◽  
The Common ◽  
Digestive Glands

The structural features of the esophagus, proventriculus and ventriculus of 4 chicken and duck carcasses were studied using the common anatomical dissection method. It is noted that the esophagus is a thin-walled, easily expandable tube, linking the pharynx to the proventriculus. It is subdivided into the cervical and thoracic regions. The length of the esophagus depends on the length of the neck. In a duck, it is 28.29 cm, in a chicken – 25.3 cm. In a hen that has a crop, there is a pre-and post-crop part. The feed swells and moistens in the crop. Ducks has a spindle-shaped crop, which is weakly developed. There is an esophagus opening in the proventriculus; the body, the top, the bottom and the intermediate zone of proventriculus are distinguished. The mucous membrane is formed in cellular folds, which are longitudinal, shriveled, with clearly visible papillae in the chicken, and in the duck they are flat. In the submucosal layer there are digestive glands that secrete mucus, enzymes and hydrochloric acid. The ventriculus consists of the body, the greater and lesser curvatures, the cranial and caudal grooves. It performs grinding of feed, and it is the largest organ of the digestive system due to the thick muscular wall. The inner surface of the ventriculus is covered with cuticle – a coarse, thick, non-tensile membrane that protects the mucosa from damage by solid food particles and from the effects of digestive juice.

GROSS ANATOMY OF THE NERVOUS SYSTEM AND RETROCEREBRAL COMPLEX OF ADULT LIOCORIS UNCTUOSUS KELTON (HEMIPTERA:MIRIDAE)

1960 ◽  
Vol 38 (3) ◽  
pp. 533-537 ◽  
Author(s):  
A. B. Ewen
Keyword(s):  
Central Nervous System ◽  
Nervous System ◽  
Gross Anatomy ◽  
Reproductive Organs ◽  
Corpus Allatum ◽  
Thoracic Ganglia ◽  
The Central Nervous System ◽  
Common Center

The gross anatomy of the central nervous system and retrocerebral complex of adult Liocoris unctuosus is described and figured. There are three ventral ganglia; the suboesophageal and first thoracic ganglia are separate, while the second and third thoracic are fused with the abdominal ganglia into a common center. Innervation of the reproductive organs in the male is described. The retrocerebral complex consists of the hypocerebral ganglion, paired corpora paracardiaca, and a single corpus allatum, and their associated nerves.

Contribution to the morphological description of the marine leech, Ozobranchus margoi (Apáthy) (Rhynchobdellida: Ozobranchidae) by using combined histology, micro-CT and SEM

Zootaxa ◽  
2017 ◽  
Vol 4337 (1) ◽  
pp. 91 ◽  
Author(s):  
MARIA CHIARA CASCARANO ◽  
KLEONIKI KEKLIKOGLOU ◽  
CHRISTOS ARVANITIDIS ◽  
PANTELIS KATHARIOS
Keyword(s):  
Digestive System ◽  
Loggerhead Turtle ◽  
Caretta Caretta ◽  
Reproductive Organs ◽  
The Body ◽  
Morphological Description ◽  
Micro Ct ◽  
Scanning Electronic Microscopy ◽  
Electronic Microscopy ◽  
Multilevel Approach

The ozobranchid leech, Ozobranchus margoi (Apáthy, 1890), parasite of the loggerhead turtle, Caretta caretta (Linnæus), was described through a multilevel approach including three different techniques: scanning electronic microscopy, histology and micro-CT. New insights are provided concerning the structure of the sensilla on the body, the eyes with emphasis on the structure of photoreceptors, the digestive system and the reproductive organs. 

scholarly journals The structure of comorbidities in cases of fatal outcomes in HIV-infected patients held at reform facilities of the Federal Penitentiary Service of Russia

2021 ◽  
Vol 23 (3) ◽  
pp. 280-284
Author(s):  
Mikhail E. Vostroknutov ◽  
Keyword(s):  
Nervous System ◽  
Digestive System ◽  
Circulatory System ◽  
Statistical Processing ◽  
Control Group ◽  
Term Forecast ◽  
Group I ◽  
Depth Analysis ◽  
Hiv Negative ◽  
Clinical Cases

Aim. To study the structure of comorbidities in HIV-infected patients who died in institutions of the penal system. Materials and methods. The material of the study was the data of a retrospective analysis of 515 clinical cases with fatal outcomes from diseases in the institutions of the Federal Penitentiary Service of Russia in the Udmurt Republic from 2004 to October 2020. The study group (group I) consisted of 91 patients from among the persons infected with HIV, the control group (group II) – patients with HIV-negative status (424 patients). Statistical processing of the material was carried out using the methods of variation statistics. Significance was assessed using the Pearson Chi-square test (χ2), Student's t test. During the study, the structure of concomitant diseases in cases of lethal outcomes was studied in dynamics. For the statistical processing of indicators and the implementation of a medium-term forecast (for three periods (years) ahead) of the values of the studied epidemiological indicators, the determination coefficient R2 was used. Results. As part of the in-depth analysis of mortality, it was proved that HIV-infected patients, unlike those with HIV-negative status, significantly more often suffer from diseases of the circulatory system (I00–I99), which were diagnosed on average in 47.1% of cases (χ2=11.557, p<0.001), diseases of the digestive system (K00–K93) diagnosed on average in more than half (58.3%) of clinical cases (χ2=12.829, p<0.001), diseases of the nervous system (G00–G99) diagnosed on average in 73.4% (χ2=74.151, p<0.001), as well as diseases of the urinary system (N00–N99), diagnosed on average in 20.8% of patients (χ2=7.993, p=0.005). With the implementation of the mid-term forecast, an increase in the structure of concomitant pathologies of diseases of the circulatory system (R2=0.4023) and diseases of the digestive system (R2=0.4807) is expected. The share of diseases of the nervous system will remain stably high (R2=0.3242). Conclusion. HIV-infected patients in penitentiary institutions are characterized by polymorbid conditions, which require timely diagnosis and therapy in order to reduce the risk of poor outcomes and disability.

scholarly journals Evaluation of the influence of arsenic on embryonic development of zebrafish (Danio rerio)

2018 ◽  
Vol 40 (1) ◽  
pp. 51-61
Author(s):  
Nguyen Thi Thuong Huyen ◽  
Tran Thi Truc Dao ◽  
Hoang Nghia Son
Keyword(s):  
Embryonic Development ◽  
Danio Rerio ◽  
Digestive System ◽  
Circulatory System ◽  
Common Type ◽  
The Body ◽  
Control Group ◽  
Hatching Rate ◽  
Development Stages ◽  
Organ Systems

Arsenic is one of heavy metal elements which is dangerous to human and aquatic animals. Accumulating in the body,arsenic causes serious damage to organ systems such as the nervous system, circulatory system, digestive system, reproductive system, ect and even cancer, skin cancer is the most common type. This study aims to evaluate the influences of Arsenic (As) concentrations on different stages in embryonic development of zebrafish (Danio rerio): blastura, gastrula, segmentation, pharyngula and hatching. After mating, embryos were exposed to As in the examined concentrations: 0, 20, 50, 80, 110, 140, 170, 200, 230, 260 µg/L in the Hank’s embryonic medium. It was observed that the survival rate of embryonic zebrafish decreased gradually corresponding to the increasing the concentration of As and the development stages of the embryo. However, examined concentrations of As in this study did not reach the threshold lethal concentration (LCt50) of embryos. With the increasing of examined As concentrations, the heartbeat increased linearly, the body turning beat of each stage decreased linearly. The highest heartbeat was 237.73±1.87 beat/min in 260 µg/L concentration while it was 197.60±2.20 beat/min in the control group (p < 0.05) in the hatching stage. The lowest body turning was 2.53 beat/min while it was 5.50 beat/min (p < 0.05) in the control group in the pharyngula stage. Moreover, the As prolonged the hatching duration and reduced the hatching rate of embryonic zebrafish, after 72 hour fertilization, the hatching rate was 77.78% in 260 µg/L concentration while it was 98.86% in the control group (p < 0.05). 

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