Dentate ligaments are best described as?

Dentate ligaments are best described as?

• A. Tiny tooth-like extensions that tether the dura to the spinal cord at each spinal nerve root.
• B. Extensions of the arachnoid membrane that drain CSF.
• C. Nerve roots carrying motor commands to the limbs.
• D. Bundles of connective tissue surrounding the spinal cord.

Answer: (A)

Dentate ligaments are lateral extensions of the pia mater that anchor the spinal cord to the dura mater, helping to stabilize the cord within the dural sac. They project like teeth between the dorsal and ventral nerve roots at each spinal level, spanning from the spinal cord to the surrounding dura. This arrangement keeps the cord centered and limits excessive sideways movement as you bend or twist, protecting neural tissue during movement. They are not extensions of the arachnoid membrane, they are not nerve roots, and they are not bundles of connective tissue surrounding the cord; their role is mechanical stabilization via pia mater extensions attaching to the dura.

Dentate ligaments are lateral extensions of the pia mater that anchor the spinal cord to the dura mater, helping to stabilize the cord within the dural sac. They project like teeth between the dorsal and ventral nerve roots at each spinal level, spanning from the spinal cord to the surrounding dura. This arrangement keeps the cord centered and limits excessive sideways movement as you bend or twist, protecting neural tissue during movement. They are not extensions of the arachnoid membrane, they are not nerve roots, and they are not bundles of connective tissue surrounding the cord; their role is mechanical stabilization via pia mater extensions attaching to the dura.