VIDEO
CONTENT
QUIZ
MATERIALS
Type
Location
Parts
Surfaces
Landmarks
Articulations
Blood Supply
Ossification
Surface Anatomy
Clinical Correlates
Interesting Facts
The clavicle is classified as a long bone despite its S-shape, which is unique compared to the typical straight structure of most long bones.
Location in the Body:
- It is situated horizontally at the top of the thoracic cavity, extending bilaterally from the sternum (breastbone) in the midline to the scapula (shoulder blade) on each side, forming part of the pectoral (shoulder) girdle.
Parts of the Bone:
- Acromial End (Lateral End): Flattened and articulates with the acromion of the scapula, forming the acromioclavicular joint.
- Body (Shaft): The main elongated portion that exhibits a double curvature, contributing to the bone’s strength.
- Sternal End (Medial End): Triangular in shape and articulates with the manubrium of the sternum, forming the sternoclavicular joint.
Surface Descriptions:
- The bone has a superior surface that is relatively smooth and a rough inferior surface where various muscles and ligaments attach.
- The anterior border is convex and smoother compared to the posterior border, which is concave and rougher.
Landmarks (Notable Features):
- Conoid Tubercle: A bony prominence near the acromial end for the attachment of the conoid ligament.
- Trapezoid Line: Running from the conoid tubercle forward and laterally, for the attachment of the trapezoid ligament.
- Subclavian Groove: A groove on the inferior surface for the subclavius muscle.
Articulations (Joints):
- Sternoclavicular Joint: Articulates with the manubrium of the sternum.
- Acromioclavicular Joint: Articulates with the acromion of the scapula.
Blood Supply:
- The clavicle receives blood primarily from the suprascapular artery and branches of the thoracoacromial artery.
Ossification (Growth Details):
- It is the first bone to begin ossification during embryonic development, with two primary centers appearing in the body around the fifth or sixth week of intrauterine life.
- A secondary ossification center appears at the sternal end during adolescence, and these centers fuse around the age of 23, making it one of the last bones to complete ossification.
Surface Anatomy:
- The clavicle is palpable along its entire length, lying just under the skin, especially the superior surface and anterior border.
Clinical Correlations:
- Fractures: Due to its location and slender shape, it is one of the most frequently fractured bones in the human body.
- Cleidocranial Dysplasia: A congenital condition affecting the development of the clavicle and other bones.
- Joint Dislocations: Both sternoclavicular and acromioclavicular joints are susceptible to dislocation injuries.
Interesting Facts:
- The clavicle serves as a strut that keeps the scapula in place, allowing for a wide range of shoulder movements.
- It’s one of the few long bones that ossify primarily through intramembranous ossification rather than endochondral ossification.
Type
The clavicle is classified as a long bone despite its S-shape, which is unique compared to the typical straight structure of most long bones.
Location
Location in the Body:
- It is situated horizontally at the top of the thoracic cavity, extending bilaterally from the sternum (breastbone) in the midline to the scapula (shoulder blade) on each side, forming part of the pectoral (shoulder) girdle.
Parts
Parts of the Bone:
- Acromial End (Lateral End): Flattened and articulates with the acromion of the scapula, forming the acromioclavicular joint.
- Body (Shaft): The main elongated portion that exhibits a double curvature, contributing to the bone’s strength.
- Sternal End (Medial End): Triangular in shape and articulates with the manubrium of the sternum, forming the sternoclavicular joint.
Surface
Surface Descriptions:
- The bone has a superior surface that is relatively smooth and a rough inferior surface where various muscles and ligaments attach.
- The anterior border is convex and smoother compared to the posterior border, which is concave and rougher.
Landmarks
Landmarks (Notable Features):
- Conoid Tubercle: A bony prominence near the acromial end for the attachment of the conoid ligament.
- Trapezoid Line: Running from the conoid tubercle forward and laterally, for the attachment of the trapezoid ligament.
- Subclavian Groove: A groove on the inferior surface for the subclavius muscle.
Articulations
Articulations (Joints):
- Sternoclavicular Joint: Articulates with the manubrium of the sternum.
- Acromioclavicular Joint: Articulates with the acromion of the scapula.
Blood Supply
Blood Supply:
- The clavicle receives blood primarily from the suprascapular artery and branches of the thoracoacromial artery.
Ossification
Ossification (Growth Details):
- It is the first bone to begin ossification during embryonic development, with two primary centers appearing in the body around the fifth or sixth week of intrauterine life.
- A secondary ossification center appears at the sternal end during adolescence, and these centers fuse around the age of 23, making it one of the last bones to complete ossification.
Surface Anatomy
Surface Anatomy:
- The clavicle is palpable along its entire length, lying just under the skin, especially the superior surface and anterior border.
Clinical Correlates
Clinical Correlations:
- Fractures: Due to its location and slender shape, it is one of the most frequently fractured bones in the human body.
- Cleidocranial Dysplasia: A congenital condition affecting the development of the clavicle and other bones.
- Joint Dislocations: Both sternoclavicular and acromioclavicular joints are susceptible to dislocation injuries.
Interesting Facts
Interesting Facts:
- The clavicle serves as a strut that keeps the scapula in place, allowing for a wide range of shoulder movements.
- It’s one of the few long bones that ossify primarily through intramembranous ossification rather than endochondral ossification.