Parathyroid gland structure of some tropical lizards

Senior, William

doi:10.1002/jmor.1051420105

Cited by 5 publications

(17 citation statements)

References 26 publications

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“…In Agamidae, two parathyroids have been found in Agama agama agama (Senior, 1974) and Calotes versicolor (Akbarsha, 1985a).…”

Section: Ophidiamentioning

confidence: 98%

“…Van Bemmelen (1888) found four parathyroids in the embryos and adults of Gekko gekko. In Hemidactylus brooki angulatus separate patches of tissue additional to the main pair of glands have been identified (Senior, 1974). These patches are thought to be isolated patches probably derived from parathyroid 111 (Senior, 1974).…”

Section: Ophidiamentioning

confidence: 98%

“…In Gekkonidae, most of the species-Gekko japonicus (Oguro, 1969, Ancylodactylus spinicollis, Lygodactylus picturatus, Tarentola ephippiata, and Ptyodactylus hasselquisti hasselquisti (Senior, 1974)-possess two parathyroids. Van Bemmelen (1888) found four parathyroids in the embryos and adults of Gekko gekko.…”

Section: Ophidiamentioning

confidence: 99%

“…The five adult species studied of the family Scincidae (Chalcides ocellatus, Scincus scincus, Tiligua occipitatis, Trachysaurus rugosus, and Mabuya perrotetti) possessed one pair (Rogers, 1963;Senior, 1974;Sidky, 1965Sidky, , 1966.…”

Section: Ophidiamentioning

confidence: 99%

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Morphology and physiological significance of parathyroid glands in reptilia

Srivastav

Sasayama

Suzuki

1995

Microscopy Res & Technique

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Adult reptiles possess one or two pairs of parathyroid glands that have been shown in many species to derive from the third and fourth pharyngeal pouches, respectively. Up to five pairs may develop during early embryonic life. Excess glands may involute during late embryogenesis. The location of the parathyroid glands differs in the various species. As a general rule, they lie just anterior to the heart, the anterior pair (parathyroid III) being associated with the carotid artery, the posterior pair (parathyroid IV) with the aortic arch. In snakes, however, the anterior pair (parathyroid III) is associated with the carotid artery near the angle of the jaw. As shown by light microscopy and, to a lesser extent, by electron microscopy, the parathyroid parenchyma comprises secretory cells which may form dark and light variants, occasional oxyphil cells, and stellate cells. They are arranged in cords separated by connective tissue containing a capillary network. Parathyroid secretory cells often form follicles which might be the result of degeneration. Degeneration may occur as a form of involution during winter in species undergoing seasonal changes. The product of parathyroid cells, the parathyroid hormone, is responsible for the maintenance of blood calcium concentration. The sites of action--bones, kidneys, intestine, endolymphatics, and dermal skeleton--are not well understood or not investigated. In some turtles, parathyroid hormone is not the (main) factor for the regulation of calcium homeostasis.

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“…In Agamidae, two parathyroids have been found in Agama agama agama (Senior, 1974) and Calotes versicolor (Akbarsha, 1985a).…”

Section: Ophidiamentioning

confidence: 98%

Section: Ophidiamentioning

confidence: 98%

Section: Ophidiamentioning

confidence: 99%

Section: Ophidiamentioning

confidence: 99%

See 2 more Smart Citations

Morphology and physiological significance of parathyroid glands in reptilia

Srivastav

Sasayama

Suzuki

1995

Microscopy Res & Technique

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“…In reptiles, the parathyroid and ultimobranchial glands have been the subject of extensive research (CLARK 1965,1971a, b, 1983, SEHE 1965, OGURO 1969, 1970, 1972, SENIOR 1974, CLARK and LAVERTY 1985, CLARK et al 1986, YAMADA et al 2001, SRIVASTAV et al 1995, 1998, however, the effects of 1,25(OH) 2 D 3 (biologically active metabolite of vitamin D) on these glands in reptiles have not been investigated. Hence, in this study we have made an attempt to investigate the effects of 1,25(OH) 2 D 3 on the plasma calcium and inorganic phosphate levels as well as on the histological changes in the ultimobranchial and parathyroid glands of the Indian garden lizard, Calotes versicolor.…”

Section: Introductionmentioning

confidence: 99%

1,25(OH)2D3 Induced Alterations in Plasma Calcium, Inorganic Phosphate, Ultimobranhial Gland and Parathyroid Gland of the Garden Lizard, Calotes Versicolor

Srivastava¹,

Mishra²,

Srivastav³

et al. 2008

Zoologica Poloniae

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Abstract. Garden lizards Calotes versicolor were procured and given daily intraperitoneal injections of 30 pmol of 1,25(OH) 2 D 3 /50 g body wt for 30 days. Lizards were sacrificed on the 1 st , 3 rd , 5 th , 10 th , 15 th and 30 th day of the experiment. The plasma calcium levels of C. versicolor remain unaffected after day 1 following 1,25(OH) 2 D 3 treatment. After day 3 the levels increase significantly which progresses up to day 10. Thereafter, the plasma calcium level tends to decrease on day 15 and the levels become normal at day 30. In 1,25(OH) 2 D 3 injected lizards the plasma inorganic phosphate levels remain unaltered up to day 3. After day 5, the value increases significantly. This increase progresses up to day 15. On day 30, the levels become almost normal. The ultimobranchial gland exhibits hyperactivity following 5 day 1,25(OH) 2 D 3 treatment which is expressed by an increase in the nuclear volume and weak staining response of the cytoplasm of ultimobranchial cells. After day 10, the nuclear volume is further increased and some of the cells are exhausted. Following 15 days 1,25(OH) 2 D 3 treatment the nuclear volume records an increase and many degenerating cells are discerned. After day 30, the nuclear volume is almost normal, most cells seem to be recovered and only a few degenerating cells are noticed. After day 10 and day 15 following 1,25(OH) 2 D 3 treatment, the parathyroid glands of C. versicolor show reduced chromaticity of nuclei and a progressive decrease in the nuclear volume of parathyroidal cells. On day 30, the nuclear volume tends to become normal and a few degenerating cells are observed.

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