31. That below, termed the nuchal plane, is rough and irregular for the attachment of several muscles. 32. From the external occipital protuberance, an often faintly marked ridge or crest, the inferior nuchal line. 33. It has a dark discontinuous mid-dorsal line with relatively long hairs that form a nuchal crest. 34. The neck is elongated and partially covered by a fused collection of bony scutes called a nuchal plate. 35. The gill is flaplike with a bipectinate ctenidium situated in the nuchal cavity and lacks secondary pallial gills. 36. The nuchal and dorsal crests are continuous, composed of closely set lanceolate spines with smaller ones at the base. 37. Techniques to preserve an intact nuchal cord depend on how tightly the cord is wrapped around the infant s neck. 38. Among those fetuses whose nuchal translucency exceeds the normal values, there is a relatively high risk of significant abnormality. 39. When nuchal translucency data from approximately 12 weeks gestation was added, this increased the detection rate to 97 %. 40. This process is broad and rounded at the end, and extends as far as the occipito-nuchal process.
