Where does most rotation occur in the vertebral column?
The movement rotating the head left and right happens almost entirely at the joint between the atlas and the axis, the atlanto-axial joint. A small amount of rotation of the vertebral column itself contributes to the movement.
Where does the majority of rotation in the cervical spine occur?
Approximately 50% of cervical flexion-extension and rotation occurs in the upper cervical spine (occiput-C2), with the remainder distributed among the subaxial segments.
Which spinal nerves affect which parts of the body?
The nerves of the cervical spine go to the upper chest and arms. The nerves in your thoracic spine go to your chest and abdomen. The nerves of the lumbar spine then reach to your legs, bowel, and bladder. These nerves coordinate and control all the body’s organs and parts, and let you control your muscles.
What part of the spine does rotation?
Together, the Atlas and Axis enable the head to rotate and turn. The other cervical vertebrae (C3-C7) are shaped like boxes with small spinous processes (finger-like projections) that extend from the back of the vertebrae.
How far should you be able to tilt your head to the side?
Between 160 to 180 degrees; i.e. you should be able to rotate your neck to the right and to the left, so that your nose is in line with your shoulder (or near enough).
What muscles are responsible for cervical rotation?
The primary muscles involved in cervical rotation are the sternocleidomastoideus, upper trapezius, and splenius group, with some assistance provided by the scalenes and intrinsics.
What is the name and function of the second cervical vertebra?
In anatomy, the axis (from Latin axis, “axle”) or epistropheus, is the second cervical vertebra (C2) of the spine, immediately posterior to the atlas, upon which the head rests. The axis’ defining feature is its strong odontoid process (bony protrusion) known as the dens, which rises dorsally from the rest of the bone.
Which vertebrae are not movable?
Vertebrae: The spine has 33 stacked vertebrae (small bones) that form the spinal canal. The spinal canal is a tunnel that houses the spinal cord and nerves, protecting them from injury. Most vertebrae move to allow for a range of motion. The lowest vertebrae (sacrum and coccyx) are fused together and don’t move.