AdministratorWhat does the atlanto-occipital joint do?
Cervical Region The atlanto-occipital joint (O-C1) acts as a pivot for the flexion/extension motion of the cranium, with 13 degrees average flexion/extension and 8 degrees lateral bending, thus allowing only a few degrees of axial rotation.
Does the atlantoaxial joint allow head movement?
The C1 C2 spinal motion segment, also called the atlantoaxial joint, is located in the upper portion of the cervical spine. It consists of the C1 and C2 vertebrae, and the anatomical structures connecting them. This segment provides rotational motion, supports the head, and protects the spinal cord and nerve pathways.
What type of joint is the median atlantoaxial joint?
synovial joint
The median atlantoaxial joint is a pivot type of synovial joint. Broadly, the joint is formed by the dens of axis (odontoid process) surrounded by an osteoligamentous ring composed of the anterior arch of atlas anteriorly and the transverse ligament of atlas posteriorly.
Which movement is limited the most between the atlanto-occipital joint?
Flexion is limited by soft tissue stops, such as the posterior atlanto-occipital membrane. Table 5-6 lists the muscles that produce the most flexion, extension, and lateral flexion between the occiput and atlas and between the atlas and axis.
What two bones make up the atlantoaxial joint?
The atlanto-axial joint is a joint between the atlas bone and the axis bone, which are the first and second cervical vertebrae. It is a pivot joint. There is a pivot articulation between the odontoid process of the axis and the ring formed by the anterior arch and the transverse ligament of the atlas.
What joints have no movement?
1. Joints Can Be Grouped By Their Function into Three Ranges of Motion
| Type of Joint Function | Examples |
|---|---|
| Synarthrosis (range of joint motion: no movement) | Skull Sutures, articulations of bony sockets and teeth in facial skeleton |
What bones are in the atlantoaxial joint?