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Questions and Answers
Which of the following ligament complexes limits the superiorly directed forces applied to the clavicle by muscles?
Which of the following ligament complexes limits the superiorly directed forces applied to the clavicle by muscles?
- Anterior sternoclavicular ligament
- Posterior sternoclavicular ligament
- Bilaminar costoclavicular ligament (correct)
- Interclavicular ligament
What is the primary restraint to both anterior and posterior translations of the medial clavicle on the sternum?
What is the primary restraint to both anterior and posterior translations of the medial clavicle on the sternum?
- Anterior sternoclavicular ligament
- Posterior sternoclavicular ligament
- Posterior capsule (correct)
- Bilaminar costoclavicular ligament
What is the function of the interclavicular ligament?
What is the function of the interclavicular ligament?
- Limits excessive depression of the distal clavicle and superior gliding of the medial clavicle on the manubrium (correct)
- Reinforces the capsule and checks anterior and posterior translatory movement of the medial end of the clavicle
- Limits elevation of the lateral end of the clavicle
- Limits the superiorly directed forces applied to the clavicle by muscles
Which ligament complex reinforces the capsule and checks anterior and posterior translatory movement of the medial end of the clavicle?
Which ligament complex reinforces the capsule and checks anterior and posterior translatory movement of the medial end of the clavicle?
What is the function of the bilaminar costoclavicular ligament?
What is the function of the bilaminar costoclavicular ligament?
What are the two segments or laminae of the costoclavicular ligament?
What are the two segments or laminae of the costoclavicular ligament?
Which ligament complex limits the inferior gliding of the medial clavicle on the manubrium that occurs with clavicular elevation?
Which ligament complex limits the inferior gliding of the medial clavicle on the manubrium that occurs with clavicular elevation?
What is the function of the posterior sternoclavicular ligament?
What is the function of the posterior sternoclavicular ligament?
Study Notes
- The sternoclavicular joint is surrounded by a strong fibrous capsule and three ligament complexes.
- The anterior and posterior sternoclavicular ligaments reinforce the capsule and check anterior and posterior translatory movement of the medial end of the clavicle.
- The posterior capsule provides the primary restraint to both anterior and posterior translations of the medial clavicle on the sternum.
- The bilaminar costoclavicular ligament is a very strong ligament between the clavicle and the first rib and limits elevation of the lateral end of the clavicle.
- The costoclavicular ligament also limits the superiorly directed forces applied to the clavicle by muscles.
- The interclavicular ligament limits excessive depression of the distal clavicle and superior gliding of the medial clavicle on the manubrium.
- The limitation of clavicular depression by the interclavicular ligament is critical to protecting structures such as the brachial plexus and subclavian artery.
- The costoclavicular ligament has two segments or laminae.
- The anterior lamina has fibers that are directed laterally from the first rib to the clavicle, whereas the fibers of the posterior lamina are directed medially from the rib to the clavicle.
- Both laminae may contribute to the inferior gliding of the medial clavicle on the manubrium that occurs with clavicular elevation.
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