Revisão anatômica do seio venoso sagital dorsal no crânio de cães braquicéfalos

Burilo

2011

The Anatomical Record

Dorsal sagittal venous sinus (DSVS) is an encephalic structure located in the midline of brain dorsal surface, starting behind the frontal venous sinus and following the brain falx in its extension. Knowing DSVS morphology and cranial-cerebral relationships it is very important for surgeon when he is planning the placement of craniotomies, in order to prevent the damage of this structure. The main purpose of this study were to establish craniometric points that can be used as key points of neurosurgical importance providing an anatomic framework to brain access regarding the localization of DSVS, and to characterize the morphology of DSVS in the three groups considered in study according their type of skull (brachycephalic-B, dolychocephalic-D and mesocephalic-M). The study was performed on 138 formalin-fixed cerebral hemispheres of 69 adult dog cadavers (23 of each group) which had been removed from the skulls after the introduction of plastic catheters through properly positioned burr holes placed on the five craniometric points considered: asterion(ast), bregma(br), glabella(g), stephanion(st) and pterion(pt). From the three groups, DSVS length and width were different, his geometry in B assumed a triangular appearance and in D, M a ''butterfly'' shape. From all craniometric points considered, only bregma (br) can be useful as a landmark to delimitate DSVS morphology in all three groups. Asterion in M, stephanion in B, glabella and pterion in all three groups, can not be used to compose a framework that help to understand skull surface projection of DSVS morphology, since their measurements were not uniform.

Section: Discussionsupporting

confidence: 92%

Section: Discussionsupporting

confidence: 89%

The Dorsal Sagittal Venous Sinus Anatomical Variations in Brachycephalic, Dolichocephalic, and Mesocephalic Dogs and Their Significance for Brain Surgery

Burilo

2011

The Anatomical Record

“…Thus, in the B and M groups we should consider the vault anterior area, and in the D group the vault posterior area, respectively. human medicine, there are only a few references to their location and use in veterinary medicine (Onar et al, 2001;De Machado et al, 2007;Schmidt et al, 2011;Carreira et al, 2011;Onar et al, 2012). The five craniometric points selected were quite useful to understand LCF anatomical morphology, its projection over the external skull surface, and to establish cranioencephalic relationships between the LCF and the vault.…”

Section: Discussionmentioning

confidence: 99%

Longitudinal Cerebral Fissure Anatomy Variations in Brachy‐, Dolicho‐ and Mesaticephalic Dogs and Their Importance to Brain Surgery

2015

The Anatomical Record

The study used a sample of 69 formalin-fixed brains from adult dog cadavers (n 5 69) and aimed (1) to characterize the longitudinal cerebral fissure (LCF) anatomy in brachy-(B), dolicho-(D) and mesaticephalic-(M) dogs and their potential differences, and (2) to establish cranioencephalic relationships between the LCF and five classical craniometric points(cp): asterion(ast), bregma(b), stephanion(st), glabella(g), and pterion(pt). Anatomical records were collected using a digital caliper, and for statistical analysis P-values < 0.05 were considered significant. The LCF length can be ranked, in ascending order as B < D < M, and if used as a surgical corridor, the M group had the greatest surgical corridor area, and the D group the smallest. LCF morphology was uniform among the three groups exhibiting dilated anterior(AR) and posterior(PR) regions and narrow middle region, where the most marked differences were registered. The LCF AR is the ideal spot to begin brain surgery if the LCF is to be used as a surgical corridor in B and M, while the LCF PR should be considered in D. The five cp selected were quite useful to understand LCF anatomical morphology, its projections over the external skull surface, and to establish cranioencephalic relationships between the LCF and vault; allowing us to consider the vault anterior area in B, and in M, and the vault posterior area in D for craniotomy initial burr-hole placement. As for the distance from the cp projections in the brain surface to the LCF regions, major differences were registered by comparing the B group with the other two, and for both hemispheres.

“…) (Carreira, ). The TVS of the dorsal venous sinus system (Machado et al., ) consists of a thin‐walled paired structure running laterally from the confluence of the sinuses along the cerebellum tentorium margins, producing grooves in the occipital and posterior–inferior angle regions of the parietal bones (Rhoton, ). The clinical importance of the TVS is related to its function in draining blood from the brain and skull towards the maxillary veins, internal jugulars and vertebral venous plexus (Pucheu et al., ).…”

Section: Introductionmentioning

confidence: 99%

Morphological Variations in the Transverse Venous Sinus Anatomy of Dogs and its Relationship to Skull Landmarks

2015

Anat. Histol. Embryol.

We characterized the anatomical morphology of the transverse venous sinus (TVS) of 69 canine adult cadavers belonging to three groups: brachycephalic (B), dolichocephalic (D) and mesaticephalic (M). In addition, we outlined its path over the skull using five classic human craniometric points (CPs): the asterion (ast), the bregma (b), the glabella (g), the stephanion (st) and the pterion (pt). The study aimed to establish anatomical differences in the TVS between groups and in the relationship between the TVS and skull. We found that TVS anatomy and its relationships to skull landmarks vary markedly between the groups, with similar anatomical arrangements in B and M. The TVS length can be ranked as M < B < D (with D being the biggest), whereas the width can be ranked as M < D < B (with B being the widest) with the right side being smaller than the left. In the B and M groups, the TVS assumes a craniocaudal trajectory that is closer to the lateral skull wall than in D, where the TVS presents a caudocranial direction. By documenting the morphological characteristics of the TVS, we can create a set of anatomical references allowing construction of a basic framework to greatly decrease the probability of TVS injury during neuronavigation procedures when supported by a good knowledge of the skull, brain anatomies and their relationships.