Ultimobranchial Follicles and Cysts in the Rat Thyroid During Postnatal Development

Christov, Konstantin; Bollmann, R.; Thomas, C.

doi:10.1016/s0005-8165(73)80124-6

Cited by 12 publications

(2 citation statements)

References 14 publications

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“…The unusual follicles observed in the fox have great similarity with ultimobranchial cysts (second system of follicles) recorded in mammalian thyroids by several investigators [Wetzel and Wollman, 1969;Wollman and Neve, 1971;Calvert, 1972;Christov et al, 1973;Jordan et al, 1973;Das, 1976, 1978], In the present study C cells have been observed in the epithelial lining of the unusual follicles which is pseudostratified by squamous, cuboidal and columnar cells. Kameda [1968Kameda [ , 1971b, Wetzel and Woll man [1969], Marks and Walker [1969] and have also observed these cells in the epithelial lining of these follicles.…”

Section: Unusual Folliclessupporting

confidence: 87%

Thyroid Calcitonin Cells and Unusual Follicles in the Fox

Srivastav¹,

Swarup²

1982

Cells Tissues Organs

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The thyro-parathyroid complex of foxes was cut into serial sections. For demonstration of calcitonin (C) cells the sections were stained by hematoxylin and eosin, PAS-hematoxylin, Davenport’s silver impregnation and lead hematoxylin. The C cells are oval and rounded in shape and unevenly distributed. The isthmus and the parathyroid glands are completely devoid of C cells. Certain unusual follicles are seen in the thyroid of the fox.

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Section: Unusual Folliclessupporting

confidence: 87%

Thyroid Calcitonin Cells and Unusual Follicles in the Fox

Srivastav¹,

Swarup²

1982

Cells Tissues Organs

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“…One is similar to a squam ous cyst and has mainly been found in the rat [ Van Dyke, 1944, 1945Axelrad and Leblond, 1955;Ishikawa, 1965;Calvert and Isler, 1970;Woilman and Neve, 1971a, b;Neve and Woilman, 1971;Calvert, 1972aCalvert, , b, 1975Krupp, 1972;Christov et al, 1973;Petko, 1975] and possibly also in the sheep [ Van Dyke, 1945]. The other type is a folli cle containing a heterogeneous cell popula-tion.…”

Section: Introductionmentioning

confidence: 86%

Fine Structure of the Second Kind of Thyroid Follicles in Mature Guinea Pigs

Juhl¹

1981

Cells Tissues Organs

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The second kind of follicle (S-follicle) is in mature guinea pigs a morphologically heterogeneous structure located in the central part of the upper two-thirds of the thyroid lobe. An S-follicle may appropriately be divided in an upper, a middle, and a lower part. This paper deals with the ultrastructure of the upper tubular part and the middle part. The latter is further subdivided in an irregular follicle and a distended follicle. In the tubular part a single cell type, termed the S-follicle cell, is dominating. This cell is most often arranged in a single layer and is characterized by an indented nucleus and by presence of pinocytose vesicles and hemidesmosomes along the basal cytoplasm membrane. In addition, C cells are frequently found. In the irregular follicle five different cell types are noticed: S-follicle cells, dark fibrillar cells, granulated cells, ciliated cells, and C cells. The S-follicle cells display an ultrastructure similar to those in the tubular part but are frequently arranged in two or more layers. Both the tubular part and the irregular follicle are surrounded by connective tissue. In the distended follicle, however, contact areas to thyroid follicles are found. Adjacent to these contact areas, cells with an ultrastructure similar to that of thyroid follicle cells proper are encountered in the wall of the S-follicle. This observation suggests that the distended part of an S-follicle in mature guinea pigs might be regarded as a kind of mixed follicle. The origin of thyroid follicle cells proper in the wall of the S-follicle is briefly discussed.

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Structure of rat ultimobranchial bodies after birth

Calvert

1975

Anat. Rec.

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The evolution of ultimobranchial bodies in Holtzman rats during the first 64 weeks after birth was studied by reconstructing three-dimensional models from serial sections stained by the periodic acid-Schiff technique.Radio-autography with 125I was made to see if ultimobranchial cells and/or follicular cells lining the lumen of mixed follicles were able to iodinate proteins. The term ultimobranchial body designates herein an embryonic vesicular structure (derived from the third pharyngeal pouch) whose wall is made of stratified squamous epithelium. During the first week after birth, the vesicular ultimobranchial body elongates rapidly and becomes a canal or a duct. During the second week, cell desquamation brings about local dilatations in the lumen of these ducts; with further enlargement ultimobranchial follicles will appear. In one-day-old rats, mixed follicles are present. Only the follicular component of mixed follicles iodinates proteins as is shown by radioautography. The reconstructed models enlarge rapidly up to the 56th day after birth at which time their weight has increased nineteenfold. These same models show that the three morphological components of ultimobranchial parenchyma, namely ducts, follicles and mixed follicles, are in continuity within the thyroid parenchyma. The formation of new thyroid follicles after birth and the possiblility that the ultimobranchial parenchyma may function as an endocrine gland of holocrine type are discussed.

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Ultimobranchial Follicles and Cysts in the Rat Thyroid During Postnatal Development

Cited by 12 publications

References 14 publications

Thyroid Calcitonin Cells and Unusual Follicles in the Fox

Thyroid Calcitonin Cells and Unusual Follicles in the Fox

Fine Structure of the Second Kind of Thyroid Follicles in Mature Guinea Pigs

Structure of rat ultimobranchial bodies after birth

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