Transverse Plane: Protraction & Retraction.
What is the sternoclavicular joint function?
The sternoclavicular joint is a saddle-type joint that allows movement of the clavicle, predominantly in anteroposterior and vertical planes, although some rotation also occurs. The ability to thrust the arm and shoulder forward requires sound function of this joint.
What movement does the sternoclavicular ligament prevent?
The costoclavicular ligament prevents upward movement of the medial clavicle when the lateral clavicle or shoulder is depressed. Medial end of clavicle Sternoclavicular joint Manubrium, sternum Interclavicular l.
What motion at the sternoclavicular joint is coupled with scapular upward rotation?
Elevation & Depression Commonly described as translatory motions in which the scapula moves upward (cephalad) or downward (caudally) along the rib cage from its resting position. These motions at ST joint occurs as a composite of SC and AC joint rotations.
What is retraction and protraction?
Retraction/Protraction/Depression/Elevation. Scapular retraction refers to moving the shoulder blades (scapula) towards the spine. The opposite is protraction – moving the shoulder blades away from the spine. If you give yourself a big bear hug your shoulder blades will protract.
Which region of the body allows for retraction and protraction?
scapula
Protraction and retraction (and protrusion and retrusion) Protraction and retraction occur in two major regions of the body – the scapula and the mandible.
What are the articular components 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.
What type of joint is sternoclavicular?
The sternoclavicular (SC) joint is a saddle-shaped, synovial joint that serves as the primary skeletal connection between the axial skeleton and the upper limb.
What is articular disc?
The articular disk (or disc) is a thin, oval plate of fibrocartilage present in several joints which separates synovial cavities. This separation of the cavity space allows for separate movements to occur in each space.
What is protraction of scapula?
During protraction, the scapulae move away from the spine as you round the upper back (thoracic spine). You protract by pushing your shoulders forward and spreading your scapulae across your back, trying to touch them in front of your chest. Retracting is done by squeezing the shoulder blades together.
Which joint allows retraction and protraction?
Protraction/Retraction The vertical axis through the sternoclavicular joint allows the scapula to be moved forward, an action termed protraction (as in “hunching the shoulders”). The action opposite to this would be one of retraction, or movement of the scapula backwards (as in “squaring the shoulders”).
Which of the following describes protraction and retraction?
Which of the following best describes protraction and retraction? protraction refers to the forward movement of a body part, and retraction to the backward movement of a part.
What are the movements of the sternoclavicular joint?
Specifically, the movements of the sternoclavicular joint are sorted into three degrees of freedom; elevation – depression, protraction – retraction, and axial rotation. This article will discuss the anatomy and function of the sternoclavicular joint
What is the difference between retraction and protraction of clavicle?
CLAVICULAR PROTRACTION AND RETRACTION OCCUR AROUND THE JOINT’S VERTICAL AXIS. Anterior movement of the clavicle’s distal end is termed “protraction,” while posterior movement of the distal end is termed “retraction.” BACKWARD AND FORWARD ROTATION OF CLAVICLE OCCUR AROUND THE CLAVICLE’S “LONG” OR LONGITUDINAL AXIS.
What is the function of the posterior sternoclavicular ligament?
This provides strong reinforcement to the anterior aspect of the joint. Similarly, the posterior sternoclavicular ligament covers the posterior aspect of the joint surfaces. Whilst also being broad, it is weaker than its anterior counterpart.
What is the posterior rotation of the clavicle?
Additionally, there is some posterior rotation of the clavicle that occurs with elevation and anterior rotation with extension. When it comes to assessing and treating joint restrictions in the SC joint, I try to keep it simple. Assess the mobility in each direction and mobilize into the restriction.
