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Clavicle


Anatomical position

Clavicle is a long, horizontal, doubly curved bone lying at the root of the neck. This bone has got a:

  • Cylindrical shaft.
  • Medial end.
  • Lateral end.
Shaft

The lateral one third is a flattened part having two borders i.e. anterior and posterior, two surfaces i.e. superior and inferior. This part of the shaft has a backward bend with concavity formed at the anterior border. Upper surface is smooth and lower surface has a ridge called “trapezoid ridge” and an elevation called “conoid tubercle”.

The medial two third is a rounded part and considered to have four surfaces with no prominent borders. This part has a forward bend with convexity at the anterior surface. The inferior surface has a longitudinal groove called “the subclavian groove”. The superior and the posterior surfaces have no important features.

Ends

The medial end or sternal end is attached to clavicular notch of the manubrium sterni (upper part of sternum) to form a “sternocalvicular joint’’.

The lateral or acromial end is attached to the acromian process of scapula to form “acromioclavicular” joint.

Muscle attachments

From the lateral third

From the medial two third

  • Pactoralis major muscle arises from the anterior surface.
  • Sternocleidomastoid (clavicular head) arises from the rough superior surface.
  • Subclavius muscle arises from the subclavian groove at the inferior surface.
  • Sternohyoid muscle arises from posterior surface near the medial end.

Clinical importance

It transmits the weight of the arms on the axial skeleton and acts as fulcrum allowing muscles to move the arm laterally. It allows the scapula to move freely on thoracic wall. Generally, it got no medullary cavity. In females it is shorter and lighter while the opposite is true in adult males.



Anatomical position

Clavicle is a long, horizontal, doubly curved bone lying at the root of the neck. This bone has got a:

  • Cylindrical shaft.
  • Medial end.
  • Lateral end.
Shaft

The lateral one third is a flattened part having two borders i.e. anterior and posterior, two surfaces i.e. superior and inferior. This part of the shaft has a backward bend with concavity formed at the anterior border. Upper surface is smooth and lower surface has a ridge called “trapezoid ridge” and an elevation called “conoid tubercle”.

The medial two third is a rounded part and considered to have four surfaces with no prominent borders. This part has a forward bend with convexity at the anterior surface. The inferior surface has a longitudinal groove called “the subclavian groove”. The superior and the posterior surfaces have no important features.

Ends

The medial end or sternal end is attached to clavicular notch of the manubrium sterni (upper part of sternum) to form a “sternocalvicular joint’’.

The lateral or acromial end is attached to the acromian process of scapula to form “acromioclavicular” joint.

Muscle attachments

From the lateral third

From the medial two third

  • Pactoralis major muscle arises from the anterior surface.
  • Sternocleidomastoid (clavicular head) arises from the rough superior surface.
  • Subclavius muscle arises from the subclavian groove at the inferior surface.
  • Sternohyoid muscle arises from posterior surface near the medial end.

Clinical importance

It transmits the weight of the arms on the axial skeleton and acts as fulcrum allowing muscles to move the arm laterally. It allows the scapula to move freely on thoracic wall. Generally, it got no medullary cavity. In females it is shorter and lighter while the opposite is true in adult males.

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