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CNS

anatomy of the brain and spinal cord

QuestionAnswer
rostral - in the superior direction (applies to CNS only)
caudal - in the inferior direction (applies to CNS only)
functions of the spinal cord - sensory and motor innervation of the entire body inferior to the head - two-way conduction pathway for signals between the body and the brain - major center for reflexes
conus medullaris - the inferior end of the spinal cord - it tapers off into a long filament of CT, the filum terminale
divisions of the spinal nerves - 8 cervical, 12 thoracic, 5 lumbar, 5 sacral, and 1 coccygeal
cauda equina - collection of nerve roots at the inferior end of the vertebral canal
Ascending fibers - carry sensory information from the sensory neurons of the body up to the brain
Descending fibers - carry motor instructions from the brain to the spinal cord
Commissural fibers - a bundle of axons that crosses from one side of the CNS to the other - carry information from one part of the spinal cord to the other
spinal funiculi - dorsal funiculus - ventral funiculus - lateral funiculus
Composition of gray matter in the spinal cord - gray commissure - dorsal horns: interneurons - ventral horns - lateral horns
Zones of spinal cord gray matter - somatic sensory (SS) - visceral sensory (VS) - visceral motor (VM) - somatic motor (SM)
Meninges - 3 CT membranes just external to the brain and spinal cord - cover and protect CNS - enclose and protect blood vessels that supply CNS - contain CSF
Dura mater - outermost layer, strongest of meninges - dense fibrous CT - forms protective covering around structures of the CNS - external to spinal dura is the epidural space
Arachnoid mater - middle layer of the meninges - subdural space between this and outermost layer of meninges
Subarachnoid space - just deep to arachnoid mater - weblike threads that hold arachnoid mater to underlying pia mater - filled with CSF and poorly protected blood vessels
Pia mater - innermost layer of meninges - highly vascularized with fine blood vessels - clings tightly to surface of spinal cord - extends into coccyx covering filum terminale - lateral extensions = denticulate ligaments
Cerebrospinal fluid - provides liquid cushion to give buoyancy to CNS - nourishes brain and spinal cord
Created by: peckman12