The cerebrospinal fibers

Cerebrospinal fibers

The cerebrospinal fibers, derived from the cells of the motor area of the cerebral cortex, occupy the middle three-fifths of the base; they are continued partly to the nuclei of the motor cranial nerves, but mainly into the pyramids of the medulla oblongata....

 consist of numerous nerve fibers collected together and enclosed in membranous sheaths. A small bundle of fibers, enclosed in a tubular sheath, is called a funiculus; if the nerve is of small size, it may consist only of a single funiculus; but if large, the funiculi are collected together into larger bundles or fasciculi

Nerve fascicle

A small bundle of nerve fibers, enclosed by the perineurium, is called a funiculus; if the nerve is of small size, it may consist only of a single funiculus; but if large, the funiculi are collected together into larger bundles or nerve fascicles, which are bound together in a common membranous...

, which are bound together in a common membranous investment.

Examples include:

• • Anterior funiculus
    Anterior funiculus
    The most lateral of the bundles of the anterior nerve roots is generally taken as a dividing line that separates the antero-lateral region into two parts, viz., an anterior funiculus, between the anterior median fissure and the most lateral of the anterior nerve roots; and a lateral funiculus,...
    
     of the spinal cord
  • Lateral funiculus
    Lateral funiculus
    The most lateral of the bundles of the anterior nerve roots is generally taken as a dividing line that separates the antero-lateral region into two parts, viz., an anterior funiculus, between the anterior median fissure and the most lateral of the anterior nerve roots; and a lateral funiculus,...
    
     of the spinal cord
  • Posterior funiculus
    Posterior funiculus
    The portion of the medulla spinalis which lies between the posterolateral sulcus and the posterior median sulcus is named the posterior funiculus. This area includes the dorsal columns which contains the fasciculus gracilis and, higher in the body, the fasciculus cuneatus, which are separated by a...
    
     of the spinal cord
  • Funiculus solitarius of the medulla
  • Funiculus separans