Fine Structure of the Tentacles ofPhoronis australisHaswell (Phoronida, Lophophorata)

Autor:	C. C. Emig, Fernando Pardos, Carmen Roldán, Jesús Benito
Rok vydání:	1991
Předmět:	Nervous system Basement membrane Cell type Tentacle Cilium Cell Biology Anatomy Biology medicine.anatomical_structure medicine Ultrastructure Animal Science and Zoology Phoronis australis Basal lamina Ecology Evolution Behavior and Systematics
Zdroj:	Acta Zoologica. 72:81-90
ISSN:	1463-6395 0001-7272
DOI:	10.1111/j.1463-6395.1991.tb00320.x
Popis:	The epidermis of the tentacles of Phoronis australis consists of six cell types: supporting cells, choanocyte-like sensory cells, both types monociliated, secretory A-cells with a mucous secretion, and three kinds of B-cells with mucoprotein secretions. On cross-sections of the tentacle, one can distinguish four faces: the frontal one, heavily ciliated and located between the two frontolateral rows of sensory cells, the lateral and the abfrontal ones. The orientation of the basal structures of the cilia is related to the direction of their beat. The basiepidermal nervous system is grouped mainly at the frontal and abfrontal faces. The basement membrane is thickest on the frontal face and consists of circular collagen fibrils near the epidermis and longitudinal ones near the peritoneum. All peritoneal cells surrounding the mesocoel are provided with smooth longitudinal myofibrils, and isolated axons are situated between these cells and the basement membrane. The wall of the single blood capillary in each tentacle consists of epitheliomuscular cells with circular myofilaments, lying on a thin internal basal lamina; there is no endothelium.
Databáze:	OpenAIRE
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