hydrocoel

hydrocoel

the water vascular system of echinoderms, which has branches to the tube feet and is concerned to this extent with locomotion.
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n=30 n=30 1 Herniotomy and Hydrocoel disconnection 18 14 2 Orchidopexy 3 4 3 Circumcision 6 4 Rectal polyp excision 2 5 Epigastric hernia 1 6 Umbilical hernia -- 7 Appendicectomy -- 8 SSG (Leg Rt.
Of these, all metamorphosed with a set of five primary podia growing from the left hydrocoel and between one and three pedicellariae, one on the dorsal surface associated with the base of the dorsal arch spicule, and two posterior on the left side--one at the base of the posterodorsal arm rod and one at the base of the pastoral arm rod (Fig.
In euechinoids, the vestibule is formed from an invagination of the larval epidermis that comes into contact with the left hydrocoel.
Rudiment diameter was measured as the contact between ectodermal invagination and hydrocoel during the early stages of contact; at later stages rudiment diameter included the enveloping ectoderm.
Concentration of larval food affected the timing of development of the echinus rudiment from the earliest stages of rudiment formation: the invagination of ectoderm overlying the hydrocoel.
For larvae with situs inversus, the right hydrocoel enlarged instead of the left to produce the rudiment that becomes the juvenile oral surface.
Competent brachiolariae display a slight leftward flexion that coincides with appearance of the five hydrocoel lobes in the rudiment on the left hand side of the larva (Figs.
The left posterior coelomic pouch is divided into a hydrocoel and somatocoel, and the former expands forward, gradually, along the stomach and esophagus, producing a 5-lobed hydrocoel (Fig.
cordatus is condensed (no larval morphogenesis) and presents a shift in the relative timing (heterochrony) of the appearance of the major features (archenteron, coelom + vestibule, hydrocoel), if compared to the typical echinoid development (archenteron, larval skeleton, larval gut, coelom, hydrocoel, vestibule).
Four lobes of the hydrocoel appear at the base of the preoral lobe on the future oral surface.
On the left side the anterior coelom gives rise to the hydrocoel [ILLUSTRATION FOR FIGURES 3D-F OMITTED].