BACKGROUND AND PURPOSE The abducent nerve is difficult to identify reliably and consistently with conventional radiologic techniques. In this study, a 3D fast asymmetrical spin-echo MR imaging technique was used to obtain detailed images of the abducent nerve in normal volunteers. METHODS The 3D fast asymmetrical spin-echo MR protocol was used to image the abducent nerves in 24 normal volunte...

The sensory epithelium lining the ampulla of Lorenzini in the skate was examined by the freeze-fracture technique. Anastomosing tight junctions (zonula occludens) completely encircle the apex of each receptor cell joining it to neighbouring support cells. The tight junctions separate two distinctly different regions of the receptor-cell surface. The apical P-face has numerous large particles wh...

Vision begins in photoreceptor outer segments with light captured by opsins in continually synthesized disc membranes. The process by which rod photoreceptor discs are formed has been controversial. In this issue, Ding et al. (2015. J. Cell Biol. http://dx.doi.org/10.1083/jcb.201508093) show conclusively that rod discs are formed by plasma membrane evagination.

Zenker's diverticulum (ZD) is a sac-like evagination of the mucosa and submucosa through Killian triangle, an area muscle weakness between transverse fibers cricopharyngeal oblique inferior constrictor muscle. The reported prevalence ZD 0.01 0.11 percent. triangle more frequent in men than women (60 versus 34 percent). definitive treatment symptomatic surgical. must be individualized for each c...

What are Lepidoptera? Butterflies, moths and skippers form the order of insects known as Lepidoptera. Estimated to include more than 150,000 species, they are widely studied and have long been known to have highly complex morphologies, fascinating lifecycles and remarkable ecologies. Their broad wings are invariably covered with arrays of minute scales. Each scale is a thin, flattened, cuticula...

The optic vesicle develops as an evagination of the cephalic neural folds. We have examined the early development of the optic vesicle in Swiss Webster mice using correlated transmission electron microscopy (TEM), scanning electron microscopy (SEM), light microscopic (LM) measurements of cell shape changes, immunohistochemical localization of basal lamina (BL) components (type IV collagen, lami...