title: Gross anatomical study of the nerve supply of genitourinary structures in female mongrel hound dogs.
abstract: Anatomical variations in lumbosacral plexus or nerves to genitourinary structures in dogs are under described, despite their importance during surgery and potential contributions to neuromuscular syndromes. Gross dissection of 16 female mongrel hound dogs showed frequent variations in lumbosacral plexus classification, sympathetic ganglia, ventral rami input to nerves innervating genitourinary structures and pudendal nerve (PdN) branching. Lumbosacral plexus classification types were mixed, rather than pure, in 13 (82%) of dogs. The genitofemoral nerve (GFN) originated from ventral ramus of L4 in 67% of nerves, differing from the expected L3. Considerable variability was seen in ventral rami origins of pelvic (PN) and Pd nerves, with new findings of L7 contributions to PN, joining S1 and S2 input (23% of sides in 11 dogs) or S1-S3 input (5%), and to PdN, joining S1-S2, unilaterally, in one dog. L7 input was confirmed using retrograde dye tracing methods. The PN also received CG1 contributions, bilaterally, in one dog. The PdN branched unusually in two dogs. Lumbosacral sympathetic ganglia had variant intra-, inter- and multisegmental connectivity in 6 (38%). Thus, the anatomy of mongrel dogs had higher variability than previously described for purebred dogs. Knowledge of this variant innervation during surgery could aid in the preservation of nerves and reduce risk of urinary and sexual dysfunctions.
authors.affiliation: Department of Anatomy and Cell Biology, Temple University School of Medicine, Philadelphia, PA, 19140, USA.
authors.forename: S M
authors.initials: SM
authors.lastname: Gomez-Amaya
authors.forename: M R
authors.initials: MR
authors.lastname: Ruggieri
authors.forename: S A
authors.initials: SA
authors.lastname: Arias Serrato
authors.forename: V S
authors.initials: VS
authors.lastname: Massicotte
authors.forename: M F
authors.initials: MF
authors.lastname: Barbe
mesh_terms: D063405:Anatomic Variation; D000818:Animals; D004210:Dissection / Q000662:veterinary; D004285:Dogs / Q000033:anatomy & histology*; D005260:Female; D005728:Ganglia, Sympathetic / Q000033:anatomy & histology*; D008160:Lumbosacral Plexus / Q000033:anatomy & histology*; D014566:Urogenital System / Q000294:innervation*
references.citation: Am J Anat. 1955 Mar;96(2):285-318
references.pmid: 14376354
references.citation: Urology. 2006 Apr;67(4):789-92
references.pmid: 16584763
references.citation: J Physiol. 1936 May 4;86(4):396-414
references.pmid: 16994767
references.citation: Folia Morphol (Warsz). 1966;25(3):433-40
references.pmid: 5296779
references.citation: Can Vet J. 2010 May;51(5):485-92
references.pmid: 20676289
references.citation: Urology. 1982 Oct;20(4):415-7
references.pmid: 6183812
references.citation: Am J Vet Res. 1988 Jan;49(1):115-9
references.pmid: 3354956
references.citation: Folia Morphol (Warsz). 1982;41(2):245-52
references.pmid: 6985138
references.citation: Can Vet J. 2010 Jun;51(6):598-604
references.pmid: 20808569
references.citation: J Neurotrauma. 2006 Jul;23(7):1125-36
references.pmid: 16866625
references.citation: Anat Histol Embryol. 2007 Dec;36(6):401-7
references.pmid: 18021347
references.citation: Clin Anat. 2009 Jul;22(5):595-600
references.pmid: 19418453
references.citation: J Anat. 1958 Jan;92(1):62-73
references.pmid: 13513498
references.citation: Anesth Analg. 1987 Jul;66(7):643-6
references.pmid: 3605673
references.citation: Neurourol Urodyn. 2011 Nov;30(8):1695-704
references.pmid: 21953679
references.citation: J Neurol Sci. 1970 Jan;10(1):11-23
references.pmid: 5460870
references.citation: Am J Vet Res. 1970 Jan;31(1):35-41
references.pmid: 5414280
references.citation: Eur J Cardiothorac Surg. 2005 Feb;27(2):320-4
references.pmid: 15691689
references.citation: J Neurotrauma. 2008 Apr;25(4):401-9
references.pmid: 18373487
references.citation: J Neurotrauma. 2008 Mar;25(3):214-24
references.pmid: 18352835
references.citation: Exp Neurol. 1979 Aug;65(2):422-34
references.pmid: 573206
references.citation: Int J Urol. 1997 Mar;4(2):111-25
references.pmid: 9179682