T9–T10 nucleus !
The nucleus pulposus is the soft, gel-like centre of the T9-T10 disc in the mid-back; it works like a water cushion that spreads the load.
Official name: T9-T10
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What it is
The soft, gel-like centre (nucleus pulposus) of the T9–T10 disc.
What it does
Works like a water cushion: it turns pressure from above into outward push on the fibre ring, spreading the load. It is under the most pressure when you bend forward and lift.
Key facts
- Where
- Centre of the T9–T10 disc, slightly toward the back, inside the annulus fibrosus
- Function
- Notochord-derived gel (about 70–90% water, proteoglycans); turns axial load into annulus tension; small in thin thoracic discs, herniation rare
Relations
- Behind
- Back of the annulus fibrosus and the posterior longitudinal ligament, then the dura and the spinal cord
Examination
- Beevor sign: when the patient lying on the back lifts the head, the umbilicus moves upward; this points to weak lower abdominal muscles from a cord lesion near the T10 segment
On imaging
CT before surgery shows whether the fragment is calcified and hints at whether it may have eroded the dura.
Common problems
- Squeezes out through a tear in the ring (herniation), usually backward and to one side, toward a nerve root.
- Loses water with age, so the disc gets thinner and stiffer.
How it is diagnosed
On MRI a healthy nucleus is bright on T2 images; a worn one turns dark ('black disc').
Treatment
- In a microdiscectomy only the loose piece that has pushed out is removed; most of the disc stays.
Clinical notes
- Cord segments sit lower than their vertebrae: behind T9–T10 lie roughly the T11–T12 segments (texts vary), so a central fragment can give a lower sensory level than the T9 root a lateral one irritates
- Band pain from the T9 root is often worked up first as abdominal disease; pain that wraps from the back around to the front at one level points to the spine
Test yourself
Think of the answer, then tap the question to see it.
How do lower thoracic nuclei such as T9–T10 differ from upper ones in herniation?
They herniate more often, and the fragment frequently calcifies.
Why is CT done before surgery for a T9–T10 nucleus herniation?
It shows whether the fragment is calcified and hints at whether it may have eroded the dura.
What lies behind the T9–T10 nucleus pulposus?
The back of the annulus fibrosus and the posterior longitudinal ligament, then the dura and the spinal cord.
Educational information, not medical advice. For any symptom, see a health professional.
Its names
- Official Latin (TA2)
- nucleus pulposus T9-T10 TA2 1686
- Official Spanish (DeCS)
- Núcleo pulposo T9-T10 DeCS D000070614
- English (TA2)
- T9-T10
Related
Sources: Terminologia Anatomica (TA2); DeCS; Anatomy, Back, Nucleus Pulposus; Anatomy, Back, Intervertebral Discs; 7.3 The Vertebral Column (OpenStax (Rice University), 2022) · adapted, CC BY 4.0.
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Representative model, for educational purposes only.
