Spinal Cord Flashcards
Integrative and control centers
Brain and spinal cord
central NS
Cranial nerves and spinal nerves
Communication lines between CNS and rest of body
Peripheral NS
Peripheral is broken into
Sensory (afferent) and motor (efferent) divisions
Somatic and visceral sensory nerve fibers
Conducts impulses from receptors to CNS
Sensory (afferent) Divison
Motor nerve fibers
Conducts impulses from CNS to effectors (muscles and glands)
Motor (efferent) Divison
Motor (efferent) is broken into
Somatic and autonomic NS
Voluntary motor
Conducts impulses from CNS to skeletal muscles
Somatic NS
Involuntary motor (visceral) Conducts impulses from CNS to cardiac and smooth muscles and glands
Autonomic NS
Autonomic is broken into
Sympathetic and parasympathetic divisons
Mobilizes body systems during activity
Sympathetic Divison
Conserves energy and promotes housekeeping functions during rest
Parasympathetic division
Where does spinal cord end?
L1 or L2
End of spinal cord at the intervertebral disc between L1 and L2
Conus medullaris
Horses tail
Cauda equina
Terminal filament
Filum terminale
Epidural space is filled with
Blood vessels, fat, and Ct to pad spinal cord
Extension of dura mates that anchors cord longitudinally
Coccygeal ligament
CSF can be removed from __ for analysis, called a ___
Subarachnoid space
Spinal tap
Myelinated axons of motor and sensory neurons are here
White matter
Cell bodies of neurons, unmyelinated axons, dendrites, and neuroglia here
Gray matter
Precise spatial relationship among fiber tracts that reflexes the orderly mapping of the body
Somatotopy
Bundles of nerve fibers
Tracts or funiculi
Carry sensory input from receptors to spinal cord and brain
Ascending or sensory tracts
Carry motor output from brain to spinal cord to periphery
Descending or motor tracts
Direct pathways
Pyramidal tracts
No reflex action and the muscle remains limp
Results from damage to
Flaccid paralysis
Anterior horn
Exaggerated reflexes because integration that occurred along the way via association fibers was __
Results from damage to
Spastic paralysis
Upper part of motor math way neurons
Paralysis of lower limbs (T1 and L1)
Paraplegia
Injury in cervical region, affects all 4 limbs
Quadriplegia
Paralysis of one side of body, usually stroke
Hemiplegia
