The infraglenoid tubercle is a structural feature on the scapula bone (also known as the shoulder blade or shoulder bone).
Location of the infraglenoid tubercle:
The location on the left scapula bone of the infraglenoid tubercle is indicated in the labelled diagrams of the scapula shown on the right (lateral view of scapula bone) and below (posterior and anterior views of scapula bone).
The position of the infraglenoid tubercle on the scapula bone can be described in words as "immediately below the glenoid cavity".
About the infraglenoid tubercle:
The infraglenoid tubercle itself is a protruding surface of bone whose surface has a rough texture and extends over a triangular area of approx. an inch (2.5 cm) in length in an average sized adult.
Recall from general knowledge of the features and markings on bones that a tubercle is typically a small tuberosity, i.e. projection, that may also be described as a round nodule or warty outgrowth.
In general 'processes' and 'projections' on bones are often surfaces to which connective tissues e.g. ligaments and tendons are attached. In the case of the infraglenoid tubercle the attachment is to the long head of the Triceps Brachii muscle of the upper-arm. That is:
The infraglenoid tubercle is the part of the scapula (bone) to which the long head of the triceps brachii (muscle) attaches.
Where does the term "infraglenoid tubercle" come from ?
- 'Infraglenoid' comes from the Latin word 'infra' meaning below and the word 'glenoid' meaning socket or cavity.
- 'Tubercle' is also from a Latin word, in this case the word 'tuber' meaning lump, in combination with the word ending used to indicate 'small', i.e. a small lump.
In the past medical students were expected to have a good background in Latin (language). This is an example of how that knowledge was useful.
For more about this and related topics see the links to other features on the scapula bone listed on the left and the pages about the scapula bone and about bone markings and features on bones.
More about bones and features on bones:
- Structures and functions of bones (an overview about the skeletal system)
- Types of bones, such as long bones, short bones, flat bones, etc.
- Bone markings and features on bones of the human body
- Types of joints, such as immoveable, slightly moveable and freely moveable joints
- Diagram of the human skeleton
- Overview of types of conditions and disorders of the skeletal system
For further information see also books about orthopaedics.