. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ^ 1 tf,' 4 C*)VB EXC TF CF SOB HE. CU CMC MMC Figure 1. Schematic diagram of the gross anatomy and body wall structure of i'rechis caupa. (A) Body plan and internal anatomy. (B) Schematic diagram of a 5 ^m thick paraffin section of the body wall showing rugose epidermis (ER) followed by three muscle layers: outer circular muscle layer (OC). middle longitudinal muscle layer (ML), and innermost circular muscle layer (1C) showing imaginations (INV) at regular intervals. (C) Schematic representation of ^m thick plastic s
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ^ 1 tf,' 4 C*)VB EXC TF CF SOB HE. CU CMC MMC Figure 1. Schematic diagram of the gross anatomy and body wall structure of i'rechis caupa. (A) Body plan and internal anatomy. (B) Schematic diagram of a 5 ^m thick paraffin section of the body wall showing rugose epidermis (ER) followed by three muscle layers: outer circular muscle layer (OC). middle longitudinal muscle layer (ML), and innermost circular muscle layer (1C) showing imaginations (INV) at regular intervals. (C) Schematic representation of ^m thick plastic section showing rugae of the epidermis with mucus cells (MC) covered by a thin cuticle (CU). (Dl Schematic representation of the ultrastructure of the epidermis at a magnification of about Note that the cuticle (CU) is made up of three layers: (I) an outer layer consisting of epicuticular projections covered by fuzzy mucus (arrow) derived from metachromatic mucus cells (MMC), (2) a middle layer that is thin and granular, and (3) an innermost layer, which is the largest, and contains many microvilli (MV) and bacteria (B). Two types of mucus cells are evident in the epidermis: orthochromatic (OMC) and metachromatic (MMC). Groups of bacteria occur inside vacuoles (BV) in the superficial epidermal layers. Numerous mitochondria (MT), tonofilaments (TF). and multivesicular bodies (MVB) are present in the deeper layers of the epidermis. Healthy epidermal cells (HE) often have lysosomal sulfide oxidizing bodies (SOB) which possess empty vacuoles. Dying epidermal cells (DE) show condensed cytoplasm and a loss oforganelles. The extracellular matrix (EXC) is composed of collagen fibers (CF) with a beaded appearance. 441. 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, Ma
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
