3 research outputs found
The morphology and morphometry of the so-called "meningo-orbital foramen" in humans
The so-called meningo-orbital foramen creates an additional link between the
orbit and the cranial cavity. This bony canal, not always present in the human
skull, contains a branch from the middle meningeal artery, providing an accessory
blood supply to the orbit. This vessel, like the foramen, is characterised by
great variability. Although older textbooks of basic anatomy suggested that it
was a rare occurrence, some current data indicate a more frequent incidence of
this foramen. These discrepancies were verified in our research. 92 orbits were
studied on 46 macerated human skulls (25 male and 21 female). Although the
incidence of the meningo-orbital foramen in the material as a whole was 28%,
the foramen in female skulls was observed to be 40.5%, compared to 18% in
male skulls. This difference was statistically significant. A double foramen was
encountered in three orbits, and in one orbit there was a triple foramen. This
means that in the material as a whole multiple foramina were observed in 4% of
cases. Two measurements were taken to determine the localisation of the meningo-
orbital foramen. The minimal distance between the supraorbital notch (or
foramen) and the meningo-orbital foramen was 35.0 (28–44) mm. The minimal
distance from the cross-point of the entrance to the orbit and the fronto-zygomatic
suture was (21.3-35.5) mm. This indicates that the meningo-orbital foramen
can lie near an operating field in some surgical interventions through the
lateral orbital wall
Analysis of operating field area in transpyramidal retrolabyrinthine approach to posterior cranial fossa
Retrolabyrinthine surgical access to the posterior and middle cranial fossa has a
long history of use during the procedures aiming at the removal of small neoplasmatic
changes located in the area of the internal auditory tube. A precise
knowledge of the anatomical alterations of the temporal bone in the aspect of
the retrolabyrinthine access to the posterior cranial fossa determines a successful
otoneurosurgical endoscopy, which involves a relatively narrow area. Fortyfour
cadaver temporal bones of both sexes were measured to obtain the dimensions
of the surgical area limited by the sigmoid sinus, superior petrosal sinus
and posterior labyrinth. The techniques of computer picture analysis were applied
in the research. The mean value of the surface area of the figure limited by
the sigmoid sinus, superior petrosal sinus and posterior semicircular canal was
175.9 mm² with no significant differences between sexes and sides. The maximal
measured value was 356 mm², and the minimal was 84.3 mm². The size of
the surgical area is characterised by large deviation range but was always sufficient
to insert the endoscopic device and standard otosurgical instruments