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The splenius cervicis (/ ˈ s p l iː n i ə s s ər ˈ v aɪ s ɪ s /) (also known as the splenius colli, /-ˈ k ɒ l aɪ /) is a muscle in the back of the neck.It arises by a narrow tendinous band from the spinous processes of the third to the sixth thoracic vertebrae; it is inserted, by tendinous fasciculi, into the posterior tubercles of the transverse processes of the upper two or three ...
The splenius muscles are: Splenius capitis muscle; Splenius cervicis muscle; Their origins are in the upper thoracic and lower cervical spinous processes. Their actions are to extend and ipsilaterally rotate the head and neck.
Their combined action is rotation and extension of the vertebral column. These muscles are small and have a poor mechanical advantage for contributing to motion. They include: the three semispinalis muscles, the multifidus muscle, and the rotatores muscles.
The interspinales are short muscle fascicles, found in pairs between the spinous processes of the contiguous vertebrae, one on either side of the interspinal ligament.. In the cervical region, the cervical interspinales are most distinct, and consist of six pairs, the first being situated between the axis and third vertebra, and the last between the seventh cervical and the first thoracic.
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The accessory nerve (CN XI) is particularly vulnerable to damage during lymph node biopsy. Damage results in an inability to shrug the shoulders or raise the arm above the head, particularly due to compromised trapezius muscle innervation.
In the cervical region they are best developed, consisting of rounded muscular and tendinous fasciculi, and are placed in pairs, passing between the anterior and the posterior tubercles respectively of the transverse processes of two contiguous vertebrae, and separated from one another by an anterior primary division of the cervical nerve, which lies in the groove between them.
splenius cervicis) from lateral side. There is anastomosis with accessory nerve , hypoglossal nerve and sympathetic trunk . It is located in the neck , deep to the sternocleidomastoid muscle.