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Questions and Answers
What is unique about the clavicle compared to other long bones?
What is unique about the clavicle compared to other long bones?
- It has an extensive medullary cavity.
- It is the only long bone lying horizontally. (correct)
- It is the only long bone that is completely subcutaneous.
- It is the longest bone in the human body.
Which part of the clavicle articulates with the acromion process?
Which part of the clavicle articulates with the acromion process?
- Medial/Sternal end
- Lateral/Acromial end (correct)
- Shaft
- Conoid tubercle
What type of ossification process occurs in the clavicle?
What type of ossification process occurs in the clavicle?
- Membrocartilaginous ossification (correct)
- Appositional ossification
- Membranous ossification
- Endochondral ossification
What feature distinguishes the inferior surface of the medial portion of the clavicle?
What feature distinguishes the inferior surface of the medial portion of the clavicle?
At what stage of development does the clavicle first begin to ossify?
At what stage of development does the clavicle first begin to ossify?
Flashcards
Clavicle
Clavicle
The collarbone, a long bone lying horizontally that connects the shoulder blade to the sternum.
Clavicle Structure
Clavicle Structure
The clavicle has two main ends, the medial (sternal) and the lateral (acromial), and a curved shaft.
Medial (Sternal) End
Medial (Sternal) End
The medial end connects to the breastbone (sternum) through a specialized joint called the sternoclavicular joint.
Lateral (Acromial) End
Lateral (Acromial) End
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Clavicle Shaft
Clavicle Shaft
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Study Notes
Clavicle Overview
- Collarbone, located horizontally
- No medullary cavity
- Membrocartilaginous ossification
- May be pierced by a cutaneous nerve (intermediate supraclavicular nerve)
Clavicle Parts
- Two ends (medial/sternal & lateral/acromial)
- Shaft
Clavicle Shaft
- Curved (medial 2/3rd round & convex, lateral 1/3rd flattened & concave)
- Flattened inferior surface
- Subclavian groove in middle third
Clavicle Medial/Sternal End
- Saddle-shaped articular surface
- Sternoclavicular joint with the manubrium
- Fibrous attachment
- Articulation disc
- Interclavicular ligament
Clavicle Lateral/Acromial End
- Flattened, downward facing
- Oval facet articulates with medial margin of acromion
- Acromioclavicular joint
- Fibrous capsule attachment
Clavicle Additional Features
- Subcutaneous throughout
- First to ossify, last to completely ossify at about 25 years old
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