Lesser tubercle

Lesser Tubercle

The Lesser Tubercle is a significant anatomical structure found in the human body. It is a part of the humerus, the long bone in the upper arm or forelimb that runs from the shoulder to the elbow.

Etymology

The term "tubercle" is derived from the Latin word "tuberculum," which means a small swelling or lump. The prefix "lesser" is used to differentiate this structure from the larger "greater tubercle," both of which are found on the humerus.

Anatomy

The lesser tubercle of the humerus is a small, rounded eminence located on the anterior aspect of the bone. It is situated medial to the head of the humerus and is separated from the greater tubercle by the intertubercular groove.

The lesser tubercle provides an attachment site for one of the four muscles of the rotator cuff, the subscapularis muscle. This muscle plays a crucial role in the internal rotation of the humerus.

Clinical Significance

Injuries or abnormalities of the lesser tubercle can lead to a range of medical conditions. For instance, fractures of the lesser tubercle, although rare, can occur and may require surgical intervention. Additionally, abnormalities of the lesser tubercle can be associated with shoulder impingement syndrome, a common cause of shoulder pain.

See Also

• Greater tubercle
• Humerus
• Subscapularis muscle
• Shoulder impingement syndrome

References

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