Thus, solid waste materials can be disposed by the coelomocytes, whereas liquid waste is excreted from this cavity via the excretory system. Previously, it was noted that GLR processes seal off the pseudocoelomic space at the anterior edge of the nerve ring, suggesting that this space may not extend further than the posterior isthmus (White et al., 1986) (see Muscle System - GLR cells). This narrowed accessory pseudocoelom may share the same functions as the main pseudocoelom, and it is likely that extracellular signals can pass between them. The pseudocoelom is in close physical contact with the excretory canals along the length of the midbody and in the head, and the CANs have close association with the canals (Exc FIG 4 and Exc FIG 7).
Motions of the nematode’s body may effectively stir the contents, but otherwise there is no active circulation per se. The permeability barriers on both sides of the pseudocoelom also allow the pseudocoelomic fluid to be pressurized beneath the elastic cuticle; thus, the fluid acts as a hydrostatic skeleton that contributes to maintain the nematode’s overall rigidity (Crofton, 1966). In aging worms, this hydrostatic pressure is often decreased. The pseudocoelomic space forms later in embryonic morphogenesis, and its fluid contents first derive from the fluid bathing the early blastomeres, the blastocoel. However, a narrow space between the pharynx and the surrounding tissues is observed even anterior to that locale, and may be considered an “accessory pseudocoelom” (Altun and Hall, unpublished; J. For instance, some signals that seem to affect the entire animal could be released into this narrow space, including the lipophilic hormones secreted by the XXX cells (see Epithelial System - Atypical Cells; Atyp FIG 3) (Jia et al 2002; Gerisch and Antebi, 2004). Stochastic and genetic factors influence tissue-specific decline in ageing alters surface antigenicity and prevents bacterial adherence.
Similarly, the NSM neurons have neurohumoral release zones extending to both sides of the GLR constrictions, suggesting that it is important to release their product into the accessory space as well as into the main portion of the pseudocoelom. Additionally, fluorescently labeled antibodies injected into the body pseudocoelom can diffuse and label extracellular peripheral membrane ligands in the anterior head (Gottschalk and Schafer, 2006). The accessory pseudocoelomic space ends near the anterior limit of the pharyngeal muscles after narrowing further in a graded fashion. The hypodermis functions to either promote fluid intake or inhibit fluid excretion, whereas the excretory system functions in disposing solutes and water that pass into the canal cell from the pseudocoelom (see Excretory System). M., Kao, G., Karantza, V., Vogel, B., Hutter, H., Chisholm, A. The coelomocytes continuously and nonspecifically endocytose fluid from the pseudocoelomic fluid (Cc FIG 5). This body cavity is called a “pseudocoelom” because it is not fully lined by mesodermal cells as in the true “coelomic cavity” of vertebrates.