Where are nuchal lines located?
occipital bone
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.
What is nuchal region?
nuchal region –> posterior region of neck. The back of neck, including the suboccipital region. Synonym: regio nuchalis, nuchal region, posterior neck region, regio cervicalis posterior.
Where is the nuchal line on the skull?
The nuchal lines are distinct curved lines on the exterior of the occipital bone, which makes up the rear base of the skull. The nuchal lines are distinct curved lines on the exterior of the occipital bone, which makes up the rear base of the skull.
Where is inferior nuchal line?
On the posterior outer surface of the occipital bone, a ridge extending laterally from either side of the greater occipital crest 1to 2 cm below the greater external occipital protuberance and curving slightly upward at its end.
Can you feel occipital bone?
The bony skull bump — known as an external occipital protuberance — is sometimes so large, you can feel it by pressing your fingers on the base of your skull.
What is the function of the nuchal lines?
The superior nuchal line provides an attachment surface on its inferomedial side for the semispinalis capitis muscle, and on its inferolateral side for the obliquus capitis superior.
What is nuchal crest?
Nuchal crest: This area, where the muscles from the back of the neck attach to the base of the skull, is smooth and rounded in females but hooked and protruding in males. Male browridges are also more pronounced.
What is the function of nuchal lines?
What is superior nuchal line?
Extending lateralward from the external occipital protuberance on either side are two curved lines, one a little above the other. The lower is termed the superior nuchal line. The superior nuchal line gives origin to the Occipitalis and Trapezius, and insertion to the Sternocleidomastoideus and Splenius capitiT.
Where are the nuchal lines located on the body?
Nuchal lines. Below the highest nuchal line is the superior nuchal line. To it is attached, the splenius capitis muscle, the trapezius muscle and the occipitalis. 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 nuchal ligament.
Which is higher the Mempin line or the nuchal line?
The upper, often faintly marked, is named the highest nuchal line, but is sometimes referred to as the Mempin line, and it attaches to the epicranial aponeurosis. Below the highest nuchal line is the superior nuchal line.
Is the superior nuchal line below the trapezius line?
Nuchal lines. Below the highest nuchal line is the superior nuchal line. To it is attached, the splenius capitis muscle, the trapezius muscle and the occipitalis.
What causes the median nuchal line to be formed?
Generally areas that serve as points of attachment for muscles have raised bone due to the stress on the bone and the stimulation that causes bone growth. The median nuchal line is also known as the external occipital crest and this is formed because of the attachment of the ligamentum nuchae that connects the cervical vertebrae to the skull.