From which anatomical location does the splenius capitis muscle originate?

The splenius capitis muscle originates from the inferior half of the ligamentum nuchae and the spinous processes of the cervical and upper thoracic vertebrae (specifically T1-T3). The ligamentum nuchae is a strong, fibrous membrane that runs from the external occipital protuberance of the skull down to the cervical vertebrae, providing attachment points for certain neck muscles, including the splenius capitis. This muscle plays an important role in the movement of the head and neck, particularly in extension, rotation, and lateral flexion.

Understanding this anatomy is crucial, as it helps to highlight the muscle's function in relation to its origin. The other locations mentioned, such as the spinous process of T1, the transverse processes of C4-C6, and the bodies of C1-C3 vertebrae, do not accurately represent where the muscle begins, emphasizing how specific anatomical knowledge is key to grasping muscle function and interaction.