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| Author(s): |
Aliny Antunes Barbosa Lobo Ladd
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Faculdade de Medicina Veterinária e Zootecnia (FMVZ/SBD) |
| Defense date: | 2009-09-15 |
| Examining board members: |
Romeu Rodrigues de Souza;
Alexandre Secorun Borges;
Antonio Augusto Coppi Maciel Ribeiro
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| Advisor: | Romeu Rodrigues de Souza |
| Abstract | |
This study aimed at detecting whether post-natal development would exert any effect on the size and number of cranial cervical ganglion (CCG) neurons of male preas (Galea spixii spixii). Twenty left CCGs from twenty preas were harvested from the Animal Facility of the Universidade Federal Rural do Semi-Árido Nordestino, Mossoró- RN and were divided into four different age groups: newborn, young, adult and aged subjects. The following parameters were estimated using Cavalieri\'s principle and optical fractionator and planar rotator , respectively: the volume of CCG, total number and mean volume of uni and binucleate neurons. After euthanasia, the CCGs were perfusion-fixed with a 4% formaldehyde solution in PBS, agar-embedded and, SUR vibrosectioned. The ganglion volume was 0.34 mm3 (newborn), 0.30 mm3 (young), 0.39 mm3 (adult) and 0.63 mm3 (aged animals) (p= 0,012). The mean volume of uninucleate neurons was 2,917 mm3 (newborn), 3,550 mm3 (young), 7,409 mm3 (adult) and 6,701 mm3 (aged animals) (p=0,0001). The main conclusions of this study were: (i) The CCG hypertrophy - 85% - is the result of post-natal development (maturation and ageing), (ii) a 154% increase (hypertrophy) in the volume of uninucleate neurons during the maturation is followed by a 10% atrophy of them during ageing. Future studies may investigate whether the size of the CCG\'s target-organs can affect the structural foundation of CCG and, therefore, add further fuel to the notion that a post-natal neurogenesis may indeed exist in sympathetic ganglia. (AU) | |
| FAPESP's process: | 06/58705-6 - Mechanisms of neuronal postnatal proliferation in the cervical ganglion of guinea pigs (Cavia aperea) Erxlebem, 1777: neurogenesis x late neuronal differentiation? |
| Grantee: | Aliny Antunes Barbosa Lobo Ladd |
| Support Opportunities: | Scholarships in Brazil - Master |