Alae Of The Crista Galli On The Ethmoid Bone, Anterior View

Description

Crista galli rises in the midline of the ethmoid bone, with the paired alae cristae galli projecting laterally like short wings at its base. From a frontal (anterior) viewpoint, the alae sit immediately lateral to the vertical ridge of the crista galli and superior to the cribriform plate, framing the midline where the falx cerebri attaches. The cribriform plate extends horizontally on either side, its perforations implied by the region adjacent to the alae, while the ethmoidal labyrinth lies farther laterally and posteriorly beyond the plate margins. Orientation is strict and architectural. These relationships matter in anterior skull base work because the crista galli and cribriform plate form a thin bony interface between the anterior cranial fossa and the nasal cavity, and fractures here are a classic source of cerebrospinal fluid rhinorrhea and post-traumatic anosmia from disruption of olfactory fila. Endoscopic sinus surgery and transcribriform approaches for olfactory groove meningioma hinge on accurate midline identification, and the alae help define that midline boundary where the dura reflects onto the falx cerebri. The fixed frontal perspective makes the symmetry of the alae and their proximity to the cribriform plate easy to teach, and it supports correlation with coronal CT where this region is evaluated for skull base dehiscence, encephalocele, or congenital variants that narrow the olfactory cleft. Use this illustration in gross anatomy and neuroanatomy modules covering the ethmoid and anterior cranial fossa, or in ENT and neurosurgical teaching files discussing cribriform plate injury, CSF leak repair, and anterior skull base landmarks. It also fits well in radiology atlases pairing bony anatomy with coronal sinus CT. Anatomical accuracy verified by SciePro's Medical Advisory Board.