Search results
Results from the WOW.Com Content Network
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, but is sometimes referred to as the Mempin line or linea suprema, and it attaches to the epicranial aponeurosis. Below the highest nuchal line is the superior nuchal line.
It arises from tendinous fibers from the lateral two-thirds of the superior nuchal line of the occipital bone and from the mastoid process of the temporal and ends in the epicranial aponeurosis. [1] The occipitalis muscle is innervated by the posterior auricular nerve (a branch of the facial nerve) and its function is to move the scalp back. [2]
Running across the outside of the occipital bone are three curved lines and one line (the medial line) that runs down to the foramen magnum. These are known as the nuchal lines which give attachment to various ligaments and muscles. They are named as the highest, superior and inferior nuchal lines.
Its superior attachment is onto the lateral portion of [2] the external surface of the occipital bone between the superior nuchal line and inferior nuchal line. [1] [2] Its superior attachment is situated lateral to that of the semispinalis capitis muscle, and overlaps the attachment of the rectus capitis posterior major muscle. [1]
The nuchal ligament and trapezius muscle attach to it. The inion (ἰνίον, iníon, Greek for the occipital bone) is used as a landmark in the 10-20 system in electroencephalography (EEG) recording. Extending laterally from it on either side is the superior nuchal line, and above it is the faintly marked highest nuchal line.
Its inferior attachment is at the spinous process of the axis (Second cervical vertebra); its superior attachment is onto the outer surface of the occipital bone on and around the side part of the inferior nuchal line. The muscle is innervated by the suboccipital nerve (the posterior ramus of cervical spinal nerve C1). The muscle acts to extend ...
The lower is termed the superior nuchal line. That area of the squamous part, which lies above the highest nuchal lines is named the occipital plane (planum occipitale) and is covered by the occipitalis muscle. That below, termed the nuchal plane, is rough and irregular for the attachment of several muscles.
The inferior attachment is (by a narrow tendon) onto the posterior tubercle [1] of the posterior arch of atlas. [2] Its superior attachment is onto the medial portion of the inferior nuchal line [1] and the external surface of the occipital bone inferior to it [2] [1] (between this line superiorly and the foramen magnum inferiorly [1]).