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Sulcus of rib 3
Other Terms: Sillon
This is the shallow groove formed on the ventrolateral surface of the rib. It begins at the costal angle and continues along the proximal two-thirds of the body. It is typically most prominent in its proximal aspect becoming weaker as it progresses distally. It provides passage for the intercostal vessels and nerve in the superior limits of the intercostal space.
Sulcus is Latin for groove or a long, shallow channel in the bone.