Funiculus (neuroanatomy)

Funiculus is a term used in neuroanatomy to describe a bundle of one or more fasciculi or tracts of the spinal cord. The term is derived from the Latin word for "little rope". In the context of the spinal cord, there are three funiculi: the anterior funiculus, the lateral funiculus, and the posterior funiculus.

Anatomy

The spinal cord is divided into three funiculi:

• Anterior funiculus: This is located between the anterior median fissure and the most lateral of the anterior nerve roots. It contains ascending and descending nerve fibers.
• Lateral funiculus: This is located between the most lateral of the anterior nerve roots and the most medial of the posterior nerve roots. It contains both ascending and descending nerve fibers.
• Posterior funiculus: This is located between the most medial of the posterior nerve roots and the posterior median sulcus. It contains only ascending nerve fibers.

Each funiculus contains several important nerve tracts, which carry information to and from the brain.

Function

The funiculi of the spinal cord play a crucial role in the transmission of nerve signals from the body to the brain and vice versa. They contain both ascending tracts, which carry sensory information to the brain, and descending tracts, which carry motor commands from the brain to the muscles.

Clinical significance

Damage to the funiculi can result in a variety of neurological conditions, depending on the location and extent of the damage. For example, damage to the posterior funiculus can result in loss of proprioception, which is the sense of the relative position of one's own parts of the body.

See also

• Spinal cord
• Nerve tract
• Neuroanatomy