The medial part of the vestibulospinal tract is the smaller part, and is primarily made of fibers from the medial vestibular nucleus.

Additionally, the pathway projects superiorly to the paramedian pontine reticular formation, indirectly innervating the nuclei of CN VI and III.

Through this superior projection, the medial vestibulospinal tract is involved in "yoking" the eyes together in response to rapid movement of the head.

Thus, cumulatively it controls head and whole body orientation.

2° (Spinomesencephalic tract → Superior colliculus of Midbrain tectum)