What articulates with sternal end?
The sternum, often called the breast bone, is located at the midpoint of the anterior thorax and is composed of the manubrium, body, and xiphoid process (Fig. 4.2). The manubrium is the most superior portion of the sternum that articulates with the clavicle—forming the sternoclavicular (SC) joint.
What type of joint is the articulation between the sternum and the ribs?
Sternocostal joints
| Type | Sternochondral joint 1: Primary cartilaginous joint (synchondrosis) Sternochondral joints 2-7: Synovial planar joints, nonaxial, uniplanar |
|---|---|
| Articular surfaces | Sternal ends of costal cartilages of the true ribs, costal notches on sternum |
How many articulations does the sternum have?
The main articulations with the body of the sternum are with cartilages 2, 3, 4, 5, 6, and 7. The upward and outward movement of these cartilages causes the greatest increase in the internal diameter of the chest.
What bones articulate with the ribs?
Each rib is a curved, flattened bone that contributes to the wall of the thorax. The ribs articulate posteriorly with the T1–T12 thoracic vertebrae, and most attach anteriorly via their costal cartilages to the sternum.
What are the articulating surfaces of the sternoclavicular joint?
The sternoclavicular joint is a connection of three articular surfaces; the sternal end of the clavicle, the clavicular notch of the manubrium of sternum and the superior surface of the first costal cartilage.
How many ribs articulate directly with the sternum?
Humans have 24 ribs split into pairs that are named numerically passing inferiorly from the neck. The first five ribs are termed true ribs because they attach directly to the sternum through the costal cartilage.
How do ribs articulate with the sternum?
The true ribs articulate with the sternum by the sternocostal joints. The first rib is an exception to that rule; it is a synarthrosis. Another thing that is good to know is that the first rib could uniquely articulate with the clavicle by the costoclavicular joint.
What are the two types of joints that involve the sternum?
The joints of the sternum are between its parts. There are two articulations: the manubriosternal (sternomanubrial) and xiphisternal (xiphosternal) joints.
How many ribs articulate directly with sternum?
seven pairs
In humans there are normally 12 pairs of ribs. The first seven pairs are attached directly to the sternum by costal cartilages and are called true ribs.
Which ribs do not articulate with the sternum?
However, the floating ribs are the ribs that do not articulate with the sternum at all; they are the distal two ribs. The true ribs articulate with the sternum by the sternocostal joints.
What ligaments stabilize the sternoclavicular articulation?
The posterior sternoclavicular ligament provides the primary anteroposterior stabilization of the SC joint. It is a ligament that extends from the posterior aspect of the sternal end of the clavicle to the posterosuperior manubrium.
What is the joint between the sternum and clavicle?
The sternoclavicular (SC) joint is the linkage between the clavicle (collarbone) and the sternum (breastbone). The SC joint supports the shoulder and is the only joint that connects the arm to the body.