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Which Meninx Forms the Terminal Filum?
Which Meninx Forms the Terminal Filum?
Maya Lin-Takahashi••7 min read
Pia mater
Pia mater
Pia mater (/ˈpaɪ. ə ˈmeɪtər/ or /ˈpiːə ˈmɑːtər/), often referred to as simply the pia, is the delicate innermost layer of the meninges, the membranes surrounding the brain and spinal cord. Pia mater is medieval Latin meaning "tender mother".
. The pia invests the spinal cord and the spinal nerve roots, blending with the epineurium
epineurium
The epineurium is the outermost layer of dense irregular connective tissue surrounding a peripheral nerve. It usually surrounds multiple nerve fascicles as well as blood vessels which supply the nerve. Smaller branches of these blood vessels penetrate into the perineurium. ... Epineurium is primarily made from collagen.
. It extends bilaterally as paired denticulate ligaments
denticulate ligaments
The denticulate ligaments are bilateral triangular lateral extensions of pia mater that anchor the spinal cord to the dura mater. They are formed by pia mater of the spinal cord coursing in-between the dorsal and ventral nerve roots bilaterally. ... They are thickest in the cervical spine.
, a series of triangular processes fixed to the dura mater. Below the conus medullaris
conus medullaris
The conus medullaris (Latin for "medullary cone") or conus terminalis is the tapered, lower end of the spinal cord. It occurs near lumbar vertebral levels 1 (L1) and 2 (L2), occasionally lower. ... The filum terminale provides a connection between the conus medullaris and the coccyx which stabilizes the entire spinal cord.
The filum terminale is the nonfunctional continuation of the end of the spinal cord. It usually consists of fibrous tissue without functional nervous tissue.
How is filum terminale formed?
The Anatomy of the Filum Terminale
The central nervous system starts to develop during the third week of gestation. This process (neurulation) leads to the formation of the neural tube, which in turn forms the conus medullaris and the terminal ventricle through tunneling and brings about the primitive spinal cord.
Maya is a hardware enthusiast who tests and reviews smart home devices, smartphones, wearables, and audio gear. She focuses on practical consumer value and build quality.
