Part of  single nerve-cell process or neuron that transfers nerve impulses away from the nerve cell body to a synapse with other cells.

An anotomically complex, synovial joint in the upper part of the cervical spine between the 1st (Atlas/C1) and 2nd (Axis/C2) vertebrae.  It is a pivot joint that allows the head to rotate/pivot and consists of the median and lateral altantoaxial joints.

Tip of the clivus bone. Serves as the midpoint of the anterior (front) border of the foramen magnum used as a craniometric point for radiological measurements of the skull.

Headaches that start in the back of the skull and upper neck; usually spurred (or increase in intensity) by valsalva maneuvers, such as: coughing, sneezing, heaving, laughing, etc.

The narrow structure between both sides of the cerebellum that plays an important role in movement and coordination.

A hollow cavity with a meninges of three layers: pia mater, arachnoid mater, and dura mater (listed from the inside out). The role of this cavity is to hold cerebrospinal fluid (CSF) that can serve to cushion and protect the spinal cord.