. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. su I. Figure 2. Light micrograph of a transverse section through the manubrium showing ectoderm (ec). endoderm (en), mesoglea (m), and four hands of ectodermal smooth muscle cells (*). Scale bar = 50 pm. Figure 3. Light micrograph of a transverse section through the radial system at the margin showing ectodermal, radial smooth muscle cells (rsm), striated swimming muscle cells (sm), inner nerve ring (ir), outer nerve ring(or), dense mesoglea (dm), fibrous mesoglea (fm), exumbrella (ex), subumbrella (su), velum (v), and ectod
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. su I. Figure 2. Light micrograph of a transverse section through the manubrium showing ectoderm (ec). endoderm (en), mesoglea (m), and four hands of ectodermal smooth muscle cells (*). Scale bar = 50 pm. Figure 3. Light micrograph of a transverse section through the radial system at the margin showing ectodermal, radial smooth muscle cells (rsm), striated swimming muscle cells (sm), inner nerve ring (ir), outer nerve ring(or), dense mesoglea (dm), fibrous mesoglea (fm), exumbrella (ex), subumbrella (su), velum (v), and ectodermal (ec) and endodermal cells (en). Scale bar = 30 jim. hands surround the peduncle, subsequently diverging to follow each of the four radial canals out to the um- brella margin. The circular neuromuscular system consists of the striated, circular muscle layer which lines the subum- brellar surface, and the inner and outer nerve rings which lie at the margin. The striated muscle layer ex- hibits extensive infolding where it meets the radial neu- romuscular system, from which it is separated by the mesoglea (Fig. 3). Figure 4. Electron micrograph of a transverse section through the ectodermal smooth muscle layer in the manubnum. The filamentous mesoglea (m) and areas of desmosomal contact (d) between adjacent myofibrils are visible. Scale bar = 1 pm. Figure 5. Area of synaptic contact (s) between two ectodermal neurons in the peduncle, showing a dense cored vesicle (dv) and a mitochondrion (m). Scale bar = 300 nm. Figure 6. Transverse section of a neuron (n) juxtaposed to ectodermal smooth muscle cell (m). Scale bar = MTI. Insert: clear vesicles from ectodermal neuron. Scale bar = 140 Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biologica
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
