Ventral horn cell counts in a Xenopus with naturally occurring supernumerary hind limbs.
نویسنده
چکیده
In a Xenopus toad, two partially functioning supernumerary hind limbs developed naturally on the right side and were innervated by the ipsilateral side of the spinal cord. The number of ventral horn cells on the right was 18% higher than on the left while the combined mass of limb muscle on the right was estimated to be a 100% greater. This result corroborates studies with transplanted supernumerary limbs.
منابع مشابه
Cell Turnover in the Spinal Ganglia of Xenopus Laevis Tadpoles.
H U G H E S (1961) has drawn up a balance-sheet of the lumbar ventral horn cells during the development of Xenopus, based both on counts of numbers of ventral horn cells throughout differentiation and of the number of degenerating cells among them at each stage. In this way, he showed that the total number of ventral horn cells is reduced from between 3000 and 4000 at differentiation to 1200 at...
متن کاملCell degeneration in the larval ventral horn of Xenopus laevis (Daudin).
CELL death accompanies a variety of developmental processes in many tissues and systems of organs. A comprehensive review by Gliicksmann (1951) has revealed how widespread is the occurrence of degenerating cells in vertebrate embryos. Within the developing nervous system, the earliest descriptions of cellular degeneration are due to Barbieri (1905) in Amphibia, and to Collin (1906) in the chick...
متن کاملExplanation for naturally occurring supernumerary limbs in amphibians.
The occasional occurrence of high frequencies of limb abnormalities, including extra limbs, in natural populations of amphibians has long been a puzzle. In this paper we report the discovery of a population in which such limb abnormalities appear to be caused by a parasitic flatworm (trematode) that uses amphibians as intermediate hosts. The cercarial larval stage of the trematode attacks amphi...
متن کاملWidespread elimination of naturally occurring neuronal death in Bax-deficient mice.
The proapoptotic molecule BAX is required for death of sympathetic and motor neurons in the setting of trophic factor deprivation. Furthermore, adult Bax-/- mice have more motor neurons than do their wild-type counterparts. These findings raise the possibility that BAX regulates naturally occurring cell death during development in many neuronal populations. To test this idea, we assessed apopto...
متن کاملThe Expression implication of GDNF in ventral horn and associated remote cortex in rhesus monkeys with hemisected spinal cord injury
Objective(s): Glial cell line-derived neurotrophic factor (GDNF) can effectively promote axonal regeneration，limit axonal retraction，and produce a statistically significant improvement in motor recovery after spinal cord injury (SCI). However, the role in primate animals with SCI is not fully cognized. Materials and Methods:18 healthy juvenile rhesuses were divided randomly into six groups, obs...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Journal of embryology and experimental morphology
دوره 49 شماره
صفحات -
تاریخ انتشار 1979