Spinal Cord Enlargements and Terminations
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Thoracic segment
Segment of the spinal cord that supplies the internal and external intercostal muscles
Diameter of the spinal cord
Approximately 2 cm, with larger areas at the cervical and lumbar enlargements
Filum terminale
Extension of the pia mater that anchors the spinal cord to the coccyx
Lumbosacral enlargement
Inferior enlargement of the spinal cord, extending from the ninth to the twelfth thoracic vertebra
Cervical enlargement
Superior enlargement of the spinal cord, extending from C4 to T1
Conus medullaris
Tapering, conical structure at the inferior end of the spinal cord
