Carpal Tunnel
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Boundaries of the Carpal Tunnel
- Roof: Flexor retinaculum.
- Floor: Carpal bones (hamate, capitate, trapezoid, trapezium, pisiform, triquetrum, lunate, and scaphoid).
- Medial Boundary: Pisiform and hamate bones.
- Lateral Boundary: Scaphoid and trapezium bones.
Attachments of the Flexor retinaculum
- Medially: It attaches to the pisiform and the hook of the hamate.
- Laterally: It attaches to the scaphoid tubercle and the trapezium.
Pressure within carpal tunnel
| Pressure (mm Hg) | Description |
|---|---|
| <20 | normal |
| 20-30 | venular flow retarded |
| 30 | axonal transport impaired |
| 40 | sensory & motor dysfunction |
| 60-80 | blood flow ceases |