What is filum terminale Externum?
Object: The filum terminale externum (FTE) is the extradural component of the filum terminale internum and little attention has been dedicated to this structure in the literature. The authors theorized that the rare intrasacral ependymomas may originate from ependymal cell collections within the FTE.
What is filum terminale anatomy?
Background: The filum terminale is a fibrous band, consisting of the filum terminale internum (FTI), connecting the conus medullaris (CM) with the dural sac (DS), and the filum terminale externum (FTE), connecting the DS with the coccyx.
Where is the filum terminale located?
an extension of the pia mater that extends from the terminal end of the spinal cord to the tailbone. The filum terminale helps to anchor the spinal cord in place.
Where does filum terminale Externum end?
coccyx
As we said, the dural sac ends at the level of the second sacral vertebra (S2). Caudal to the end of the dural sac is a specialization of meninges called the coccygeal ligament (or filum terminale externum) that attaches the meninges, and consequently the spinal cord, to the coccyx.
Is filum terminale Externum a pia mater?
The filum terminale is continuous with the pia mater and is described as having two sections: filum terminale internum: upper three quarters of the filum; covered by the spinal dura and arachnoid meninges.
How filum terminale is 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.
What covers the filum terminale?
filum terminale internum: upper three quarters of the filum; covered by the spinal dura and arachnoid meninges.
Which accurately describes the filum terminale?
Which accurately describes the filum terminale? It is a membrane that protects the spinal cord.
Is filum terminale Externum covered by dura mater?
The lower part, or filum terminale externum, closely adheres to the dura mater. It extends downward from the apex of the tubular sheath and is attached to the back of the first segment of the coccyx in a structure sometimes referred to as the coccygeal ligament.
What is difference between filum terminale Internum and Externum?
filum terminale internum: upper three quarters of the filum; covered by the spinal dura and arachnoid meninges. filum terminale externum: lower quarter of the filum; fuses with the investing dura mater and continues inferiorly to attach to the dorsal coccyx.
What does the filum terminale look like?
The filum terminale (“terminal thread”) is a delicate strand of fibrous tissue, about 20 cm in length, proceeding downward from the apex of the conus medullaris. It is one of the modifications of pia mater.
Where does the filum terminale Externum end?
What is the origin of the filum terminale?
By definition, the tight or fatty filum terminale originates below the level of the lowest nerve root origins. Additionally, this entity is not associated with a dorsal dural defect. These characteristics decrease the risk of neurologic injury or CSF leak when surgical detethering is performed.