Anatomy: The muscles on the back of the upper arm (brachium) comprise the 3-headed arm stretcher (M triceps brachii). The muscle primarily stretches the elbow joint (and the shoulder joint). 1  Clavicula.  Bursa subcutanea acromialis.
Overview. The cervical spine is made up of 7 vertebrae. The first 2, C1 and C2, are highly specialized and are given unique names: atlas and axis, respectively. C3-C7 are more classic vertebrae, having a body, pedicles, laminae, spinous processes, and facet joints.
The spine is made up of 24 bones, called vertebrae. Ligaments and muscles connect these bones together and form what is called the spinal column. The spinal column has three main segments. From top to bottom they are the cervical spine, the thoracic spine, and the lumbar spine.