International Journal of Advanced Engineering Research and Science (IJAERS) [Vol-6, Issue-3, Mar- 2019] https://dx.doi.org/10.22161/ijaers.6.3.8 ISSN: 2349-6495(P) | 2456-1908(O) www.ijaers.com Page | 49 Origin and Distribution of the Lumbosacral Plexusin Sus scrofa (Mammalia:Suidae) Lázaro Antônio dos Santos 1 , Lorena Tannus Menezes 2 , Lucas Assis Ribeiro 1 , Frederico Ozanam Carneiro e Silva1, FredericoBalbino Lizardo 2 ,Zenon Silva 3 , Roseâmely Angélica de Carvalho Barros 3 , Daniela Cristina de Oliveira Silva 2* 1 Faculty of Veterinary Medicine, Federal University of Uberlandia, Uberlândia, MG, Brazil. 2 Institute of Biomedical Sciences, Federal University of Uberlândia, Uberlândia, MG, Brazil. 3 Biotechnology Academic Unit, Biological Sciences Nucleus, Federal University of Goiás, Catalão, Brazil. *Corresponding author: Dra. Daniela Cristina de Oliveira Silva Laboratory of Comparative Anatomy, Federal University of Uberlandia: Pará Avenue 1720, Campus Umuarama, 38400-902, Uberlandia, MG, Brazil. Tel.: +55 34 3225 8475; +55 34 99171 0898; E-mail address: dcosilva@ufu.br, ORCID: 0000-0001- 6931-5746 Abstract — The aim of the present study was describe the origin and distribution of the lumbosacral plexus of Sus scrofa. Thirty specimenswere fixed in 10% formalin solution and prepared according to the macroscopic dissection procedures.TheSus scrofa presented five (40%) or six (60%) lumbar vertebrae and the plexus was derived from L2 to S4 spinal nerves.Eight nerves were originated from the plexus and distributed to the pelvic limb: (1) lateral femoral cutaneous, from L2-L4, branched in the psoas minor, psoas major and internal abdominal oblique muscles; (2) femoral, from L3-L6, supplied the psoas major, psoas minor, iliacus, pectineus and quadriceps femorismuscles; emitted the saphenous nerve that innervates the sartorius muscle; (3) obturator, from L3- L6, distributed to the gracilis, obturator externus, pectineus and adductor muscles; (4) cranial gluteal, from L4-S1,branched the middle gluteal and piriformis muscles; (5) caudal gluteal, from L6-S2, supplied the superficial gluteal muscle; (6) sciatic, from L4-S2, innervated the tensor fasciae latae, middle, accessory and deep gluteal, semitendinosus, semimembranosus, biceps femoris, piriformis, gemelli and quadratus femoris muscles; emitted the (a) tibial nerve, that innervates the caudal muscles of the leg and divided into medial and lateral plantar nerves, terminating as plantar digital nerves; (b) common fibular nerve, divided into superficial and deep fibular nerves, that supplied the cranial and lateral muscles of the leg, terminating as dorsal digital nerves; (7) pudendal, from S2-S4, distributed to perineal muscles; emitted the dorsal nerves of clitoris and penis; (8) caudal rectal, from S2-S4, branched to perineal muscles. Keywords— Anatomy, Artiodactyla, Pelvic limb, Spinal nerves, Wild boar. I. INTRODUCTION Wild boars (Sus scrofa Linnaeus, 1758) are mammals belonging to the Suidae family, originating in Europe, Asia and North Africa, but they can now be found in several oceanic islands and on all continents, except Antarctica [1]. Although belonging to the same family, there are several differences between the domesticated pig and the wild boar. The latter possesses the horsehair and long hairs, the length of the thoracic limbs is slightly larger than pelvic limbs, in addition to be a taller and shorter animal [2]. The lumbosacral plexus consists of the ventral branches of the spinal lumbar and sacral nerves [3]. Dyce et al.(2010) [4]described that the lumbosacral plexus in dogs is responsible for the innervations of the pelvic limbs and is formed from the ventral branches of the fourth (L4), fifth (L5), sixth (L6) and seventh (L7) lumbar spinal nerves, and from the ventral branches of the first (S1) and second (S2) sacral spinal nerves, whereas in the swine the nerves of this plexus are originated from the ventral branches of the third lumbar spinal nerve (L3) to the third sacral spinal nerve (S4) [5]. The knowledge of the formation and composition of this plexus is important to understand anatomical, physiological, and postural aspects as well as to contribute with other studies of Comparative Anatomy, providing important data for anesthetic, surgical and clinical procedures. Therefore, the aim of this study is to