- Source: Foramen rotundum
The foramen rotundum is a circular hole in the sphenoid bone of the skull. It connects the middle cranial fossa and the pterygopalatine fossa. It allows for the passage of the maxillary nerve (V2), a branch of the trigeminal nerve.
Structure
The foramen rotundum is one of the several circular apertures (the foramina) located in the base of the skull, in the anterior and medial part of the sphenoid bone.
The mean area of the foramina rotunda is not considerable, which may suggest that they play a minor role in the dynamics of blood circulation in the venous system of the head.
= Development
=The foramen rotundum evolves in shape throughout the fetal period, and from birth to adolescence. It achieves a perfect ring-shaped formation in the fetus after the 4th fetal month. It is mostly oval-shaped in the fetal period, and round-shaped after birth (generally speaking). After birth, the rotundum is about 2.5 mm and in 15- to 17-year-olds about 3 mm in length. The average diameter of the foramen rotundum in adults is 3.55 mm.
Function
The foramen rotundum allows the passage of the maxillary nerve (V2), a branch of the trigeminal nerve. It also allows the passage of the artery of the foramen rotundum and an emissary vein.
History
= Etymology
=Foramen is the Latin term designating a hole-like opening. It derives from the Latin forare meaning to bore or perforate. Here, the opening is round as indicated by the Latin rotundum meaning round.
See also
Foramen ovale
Foramen spinosum
Foramina of skull
References
This article incorporates text in the public domain from page 150 of the 20th edition of Gray's Anatomy (1918)
External links
Anatomy photo:22:os-0905 at the SUNY Downstate Medical Center
cranialnerves at The Anatomy Lesson by Wesley Norman (Georgetown University) (V)
Superior view of the base of the skull at winona.edu