. The anatomy of the frog. Frogs -- Anatomy; Amphibians -- Anatomy. THE THYROID GLAND. 323 Not uncommonly several smaller in the rich anastomosis surrounding- The dorsal surface of the g-land is lobulated, the ventral surface flatter and convex. The glands of opposite sides are seldom symmetrical. b. Minute structure (Fig. 212 I and II). [The g-land possesses a connective-tissue capsule, which sends in trabe- culae to support the vesicles of which the gland is composed. The vesicles (I and II), which vary greatly in size, are closed" .jjavities, usually of a rounded or oval form, but some
. The anatomy of the frog. Frogs -- Anatomy; Amphibians -- Anatomy. THE THYROID GLAND. 323 Not uncommonly several smaller in the rich anastomosis surrounding- The dorsal surface of the g-land is lobulated, the ventral surface flatter and convex. The glands of opposite sides are seldom symmetrical. b. Minute structure (Fig. 212 I and II). [The g-land possesses a connective-tissue capsule, which sends in trabe- culae to support the vesicles of which the gland is composed. The vesicles (I and II), which vary greatly in size, are closed" .jjavities, usually of a rounded or oval form, but some- times branched (Baber). Each vesicle is lined with a single layer of cubical or slightly columnar epithelium (II, a), which rests on a delicate basement-membrane of con- nective-tissue, placed between the epithelium and the sur- rounding lymphatics (Baber). Zeiss describes a delicate reti- culum between the epithelial cells. The vesicles always contain mucus (b), and are surrounded by a fine anastomosis of blood- vessels (r).] supplemental glands are foiind the orffan. >>)x\ Fig. 212. „ r \. inute structure of the thyroid gland of Rana esculenta.—G. H. Section through the gland (Hartnack, Oc. I, Syst. 3). Small portion of above (Hartnack, Oc. I, Syst. 7). a Epithelium lining the vesicles. 6 Mucus. (• Blood-vessels, injected with blue VI. THE LYMPHATIC GLANDS OF THE HYOID REGION (TONSILS?). a. [General description. These are two oval, reddish-coloured, soft lymphatic glands, placed one on each side of the larynx. Frequently they are divided into two or three lobes by more or less Y 2. 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 Ecker, Alexander, 1816-1887; Haslam, George. Oxford, Clarendon Press
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