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Spinal Cord Anatomy

17.1--Spinal Cord Anatomy

TermDefinition
Vertebral Column Protects against blows or bumps on the spinal cord
Meninges Three protective connective tissue coverings that encircle spinal cord and brain. Superficial to deep: dura mater, arcachnoid mater, pia mater.
Leptomeninges Arachnoid mater and pia mater
Subarachnoid Space Between leptomeninges; contains cerebrospinal fluid
Spinal meninges Surrounds spinal cord
Cranial Meninges continuous with spinal; encircles brain
Epidural Space Between dura mater and wall of vertebral column; cushion of fat and connective tissue
Dura Mater Thick strong layer; dense irregular connective tissue; continuous with brain meninges until second sacral vertebra
Arachnoid Mater Middle of meningeal membranes; thin, avascular covering comprised of cells and thin, loose arrays of collagen; between dura and arachnoid is subdural space
Pia Mater Thin transparent connective tissue; adheres to surface of spinal cord and brain. Thin squamous to cuboidal cells within collagen and fine elastic fibers. Many blood vessels that provide oxygen and nutrients to spine
Denticulate ligaments Thickening extensions of pia mater; project laterally and fuse with arachnoid mater. Protect spinal cord from sudden displacement
Spinal Cord Oval in shape; extends from medulla oblongata to second lumbar vertebra
Cervical Enlargement C4-->T1; Upper limb nerves. Superior enlargement
Lumbar Enlargement T9-->T12; Lower limb nerves. Inferior
Conus Medullaris Termination point of cord. Ends at L1, L2.
Filum Terminale Extension of pia mater that extends inferiorly and fuses with arachnoid mater and dura mater to anchor spinal cord to coccyx
Cauda Equina Roots of lower spinal nerves (lumbar, sacral, and coccygeal) angle inferiourly and end in wisps of threads. Because spinal cord is shorter than vertebral column
Created by: 100000434525601