Spinalis Thoracis (Musculus spinalis thoracis)
Educational content only — not medical advice.
Anatomy
The prominent and most constant thoracic component of the spinalis column, lying medial to longissimus thoracis. It arises by distinct tendons from the spinous processes of the upper lumbar and lower thoracic vertebrae and inserts into the spinous processes of the middle and upper thoracic spine. It functions directly to extend the thoracic vertebrae and oppose thoracic hyperkyphosis.
Origin & insertion
From the spinous processes of T11 through L2, into the spinous processes of the upper thoracic vertebrae (T2 through T8).
Action
Extends the thoracic vertebral column; aids slightly in lateral flexion of the thorax.
Innervation
Posterior rami of thoracic spinal nerves (T3–T11).
Clinical notes
Isolated tenderness along spinalis thoracis insertions is frequently identified in thoracic paraspinal muscle fatigue from prolonged sedentary desk postures.
Related structures
Educational references
FAQ
What is the role of the Spinalis Thoracis?
The prominent and most constant thoracic component of the spinalis column, lying medial to longissimus thoracis. It arises by distinct tendons from the spinous processes of the upper lumbar and lower thoracic vertebrae and inserts into the spinous processes of the middle and upper thoracic spine. It functions directly to extend the thoracic vertebrae and oppose thoracic hyperkyphosis.
Why is the Spinalis Thoracis clinically important?
Isolated tenderness along spinalis thoracis insertions is frequently identified in thoracic paraspinal muscle fatigue from prolonged sedentary desk postures.
Source & license
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