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.
Anatomy of the spine. The spinal column is made up of 33 vertebrae that are separated by spongy disks and classified into distinct areas: The cervical area consists of 7 vertebrae in the neck. The thoracic area consists of 12 vertebrae in the chest. The lumbar area consists of 5 vertebrae in the lower back.