Essentials of Zoology for Students of Medicine And First Year Students of Scienc
Essentials of Zoology for Students of Medicine And First Year Students of Scienc
Alexander Meek
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The cavity narrows internally to an opening which is the true, or at all events the original, mouth. The margin of the oral cavity is produced into numerous processes which are called cirri. The anal opening is on the left side of the ventral fin. The atriopore is the median opening at the posterior end of the metapleure and in front of the ventral fin ; it discharges the contents of the atrial cavity. 134 ESSENTIALS OF ZOOLOGY Sections will show that the ectoderm is a single layer of columnar ...cells which secretes a cuticle externally and is based on a thin layer of connective tissue or dermis internally. INTERNAL MORPHOLOGY. The main features of structure can be made out by dissection, but it is better to examine prepared specimens of young and sections of the adult. The connective tissue which forms a thin dermis under the ectoderm is continued into septa between the myotomes, and these internally are continued in the sheaths which surround the nerve cord and the notochord, and with fasciae which separate the muscles from the cavities below.
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