Banca de DEFESA: THAIS MATTOS ESTRUC

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : THAIS MATTOS ESTRUC
DATE: 03/09/2020
TIME: 15:00
LOCAL: ON-LINE
TITLE:

Origin and Distribution of the Lumbosacral Plexus Nerves of Two Didelphis Species (Didelphidae, Didelphimorphia)

KEY WORDS:

innervation, hindlimb, opossum, marsupial

PAGES: 70
BIG AREA: Ciências Biológicas
AREA: Zoologia
SUBÁREA: Morfologia dos Grupos Recentes
SUMMARY:

Morphological studies provide knowledge that allows understanding how animals interact with the
natural environment or captivity. The aim of this study was to describe the origin and antimeric
distribution of the lumbosacral plexus nerves of Didelphis aurita and D. albiventris, as well as to
describe the skeleton and dimensions of the lumbar intumescence of the species in this study.
Fourteen adult cadavers of D. aurita were used, seven males and seven females, from the Serra
dos Órgãos National Park (PARNASO), 13 adult cadavers of D. albiventris, seven males and two
females, from the collection of the Animal Anatomy Laboratory of the Federal University of
Pampa (UNIPAMPA), and two males and two females from the Mammal Collection of the
National Museum / UFRJ (MNRJ). The specimens were sexed, identified and fixed with perfusion
of 10% formaldehyde solution. Then, they were dissected until exposure of the origins of the
lumbosacral plexus nerves. The data were represented in absolute frequency and simple
percentage. The right and left lumbosacral plexuses derived a trunk for the femoral and obturator
nerves of the ventral branches of L3-L4 (75%) in D. aurita, and in D. albiventris the femoral
nerve of L3-L4 (73.1%) and obturator nerve of L3-L4 (61.5%). In the two studied species there
was formation of a lumbosacral trunk derived from branches of L5-L6-S1 in 78.6% in D. aurita
and in 61.5% in D. albiventris. Lumbar intumescence originated from L2-L5 (46.2%) with an
average length of 4.69 ± 0.62 cm in D. aurita and L2-L4 (38.5%) with an average length of 4.38 ±
0,71cm in D. albiventris. There was a positive correlation between lumbar intumescence and
rostrosacral length in D. aurita (p = 0.0141 and r = 0.6598) and D. albiventris (p = 0.0323 and r =
0.5941). There was no significant difference in size between the lumbar intumescence of the two
species (p = 0.3164). The origin and distribution of the lumbosacral plexus nerves, the skeleton
and dimensions of the lumbar intumescence of the studied species show similarities with domestic
and wild euterium mammals. The lumbosacral plexuses in D. albiventris and D. aurita were
formed by contributions from the last four lumbar ventral branches of the spinal nerves (L3, L4,
L5 and L6) and the first sacral (S1), being the most cranial origin also observed in primates and in
Xenarthra species.

BANKING MEMBERS:
Externo à Instituição - ANDRÉ RODRIGUES BARRETO DA CUNHA VIANNA
Interno - 2181722 - MARCELO ABIDU FIGUEIREDO
Externo à Instituição - MARCO AURÉLIO PEREIRA SAMPAIO