Basal Plate


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Basal Plate

 

(1) An elastic, unstructured plate situated under the single-layer surface epithelium in some groups of invertebrates (ciliated worms, nemerteans), Hemichordata (Balanoglossus), and Cephalochorda (lancelets). It is formed from the secretions of epithelial cells. It separates the epithelium from the underlying musculature or connective tissue and serves as an attachment for muscles.

(2) In hydroid polyps, the basal plate (corresponds to the mesoglea in medusae) is a delicate unstructured plate lying between the ectoderm and endoderm.

References in periodicals archive ?
In about the posterior third, some tubuli join again into one main tube which opens through the basal plate posteriorly (Fig.
According to our definition, the ctenii on the European flounder cover most of the basal plate on the tubercles.
The basal plate is slightly convex, compact and lacks pores.
Instead, its skin bears very tiny thumbtack prickles, each with a nearly round, porous basal plate and a single high vertical spinule.
Spiny tubercles have a flattened basal plate with variable posterior outgrowths and with up to three somewhat radially placed rows of spines, which extend either nearly parallel to the skin of the fish (Fig.
Apparently, these large, roundish tubercles grew by thickening of the basal plate and by addition of new spinules at the external margin.
7, 7a): Basal plate of uncus deeply emarginate at middle, divided into two triangular lateral lobes, slightly concave on lateral margin.
8, 8a): Basal plate of uncus roundly convex on caudal margin.
Vascular canals open on the surface of the basal plate around the odontodes.
Osteostracans have distinct radial structure of peripheral sections of the base of tesserae, which are absent on the basal plate of Karksilepis gen.
Asymmetrical jaw apparatus of labidognath type consisting of paired MI and MII; basal plate most likely present, other jaws unknown.