The elasmobranch fishes (1934) The elasmobranch fishes . elasmobranchfish03dani Year: 1934 132 THE ELASMOBRANCH FISHES crease in size posteriorly. The lining of the pharynx is a continuation of that of the buccal cavity, being made up of a deeper layer of comiective tissue and a superficial epithelium; in the latter are located the mucous cells. Special interest attaches to the pharyngeal region because of two structures associated with it, the thymus and the thyroid glands. The thymus gland is an embryonic structure appearing as a series of nodules connected into a chain above the gill pocke
The elasmobranch fishes (1934) The elasmobranch fishes . elasmobranchfish03dani Year: 1934 132 THE ELASMOBRANCH FISHES crease in size posteriorly. The lining of the pharynx is a continuation of that of the buccal cavity, being made up of a deeper layer of comiective tissue and a superficial epithelium; in the latter are located the mucous cells. Special interest attaches to the pharyngeal region because of two structures associated with it, the thymus and the thyroid glands. The thymus gland is an embryonic structure appearing as a series of nodules connected into a chain above the gill pockets. We have seen that six such
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