Thoracic vertebra T9

Function

Anchors the ninth rib as the cage tapers toward the subcostal margin; the spinal cord here carries the upper abdominal dermatomes.

Landmarks

• Costal facets
• Demifacets
• Spinous process

Articulations (joints)

• T8 above
• T10 below
• Ninth rib

Clinical relevance

Scheuermann kyphosis most often afflicts the mid-lower thoracic vertebrae around T7–9 in adolescents, producing wedged bodies and a rounded back.