Suboccipital trigonum

This is a topographical formation also known as trigonum arteriae vertebralis.

Boundaries
The medial border is formed by the rectus capitis posterior major muscle ,

laterally it is defined by the obliquus capitis superior muscle ,

caudally musculus obliquus capitis inferior.

The bottom is represented by the membrana atlantooccipitalis posterior, arcus posterior atlantis.

Content
The trigonum contains the vertebral artery before it passes through the atlantooccipital membrane, the suboccipital nerve emerges below the artery , and the major occipital nerve emerges below the caudal edge of the obliquus capitis inferior muscle. N. occipitalis major goes upwards and medially, pierces the edge of the semispinalis capitis muscle and the beginning of the trapezius muscle, continues into the occipital landscape.

related articles

 * Back muscles
 * Suboccipital puncture (pediatrics)