Nuchal lines 4297284 209444938 2008-05-01T12:47:17Z Gracillis 4775916 [[th:เส้นหลังคอ]] {{Infobox Bone | Name = Nuchal lines | Latin = | GraySubject = 31 | GrayPage = 130 | Image = Nuchal lines.png | Caption = [[Occipital bone]]. Outer surface. | Image2 = Gray1193.svg | Caption2 = Side view of head, showing surface relations of bones. (Superior and median lines visible at bottom right.) | System = | MeshName = | MeshNumber = | }} The '''nuchal lines''' are four curved lines on the external surface of the [[occipital bone]]: * The upper, often faintly marked, is named the '''highest nuchal line''', and to it the [[galea aponeurotica]] is attached. * Below the highest nuchal line is the '''superior nuchal line'''. To it is attached the [[Sternocleidomastoid muscle]], [[Occipitalis muscle]], and [[Splenius capitis muscle]], and the [[trapezius muscle]]. * From the external occipital protuberance a ridge or crest, the '''median nuchal line''', often faintly marked, descends to the [[foramen magnum]], and affords attachment to the [[ligamentum nuchæ]]. * Running from the middle of this line is the '''inferior nuchal line'''. Attached are the [[Obliquus capitis superior muscle]], [[Rectus capitis posterior major muscle]], and [[Rectus capitis posterior minor muscle]]. ==Additional images== [[Image:Superior_nuchal_line.PNG|thumb|left|300px|Posterior view of superior nuchal line (labeled in red) and muscles connecting to it.]] <gallery> Image:Gray187.png|Base of skull. Inferior surface. </gallery> ==External links== * {{RocheLexicon|34257.000-1}} {{Gray's}} {{Skull}} [[it:linee nucali]] [[th:เส้นหลังคอ]]