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CENTRAL NERVOUS SYSTEM
THE SPINAL CORD
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FUNCTIONS OF THE SPINAL CORD
• CONDUCTS NERVE IMPUSLES TO AND FROM THE BRAIN
• PROCESSES SENSORY INFORMATION (LIMITED)
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DEVELOPMENT OF SPINAL CORD
• UNTIL THIRD FETAL MONTH, SPINAL CORD IS AS LONG AS THE VERTEBRAL COLUMN
• VETERBRAL COLUMN GROWS FASTER
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FILIUM TERMINALE
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CONUS MEDULLARIS
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SPINAL NERVES
• 31 PAIRS
• CERVICAL
• THORACIC
• LUMBAR
• SACRAL
• COCCYGEAL
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CAUDA EQUINA
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CERVICAL ENLARGEMENT
• INFERIOR CERVICAL REGION
• GIVES RISE TO SPINAL NERVES THAT SERVE UPPER LIMBS
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LUMBAR ENLARGEMENT
INFERIOR THORACIC
SUPERIOR LUMBAR REGIONS
GIVES RISE TO SPINAL NERVES THAT SUPPLY LOWER LIMBS
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SPINAL CORD IN CROSS-SECTION
• ANTERIOR MEDIAN FISSURE
• POSTERIOR MEDIAN SULCUS
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MENINGES OF THE SPINAL CORD
• DURA MATER
• ARACHNOID MATER
• PIA MATER
• DENTICULATE LIGAMENTS
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SPINAL CORD COMPOSITION
• WHITE MATTER
• GRAY MATTER
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GRAY MATTER OF THE SPINAL CORD
• GRAY COMMISSURE
• CENTRAL CANAL
• DORSAL/POSTERIOR HORNS
• VENTRAL/ANTERIOR HORNS
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ROOTS OF SPINAL NERVES
• DORSAL
• VENTRAL
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DORSAL ROOTS
• ENTER SPINAL CORD AT TIPS OF POSTERIOR HORN
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DORSAL ROOT GANGLIA
• SPINAL GANGLIA
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VENTRAL ROOTS
• LEAVE SPINAL CORD AT TIPS OF ANTERIOR HORN
• MOTOR
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SPINAL NERVE
• FORMED BY FUSION OF DORSAL AND VENTRAL ROOTS
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WHITE MATTER
• COMPLETELY SURROUNDS THE GRAY MATTER
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DIRECTION OF TRAVEL
• UP THE SPINAL CORD TO HIGHER LEVELS OR THE BRAIN
• DOWN THE SPINAL CORD FROM BRAIN OR HIGHER LEVELS
• ACROSS THE CORD, FROM ONE SIDE TO THE OTHER
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AREAS OF THE WHITE MATTER
• POSTERIOR FUNICULUS
• LATERAL FUNICULUS
• ANTERIOR FUNICULUS
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TRACTS OR FASCICULI
• ASCENDING-SENSORY
• DESCENDING-MOTOR
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ASCENDING TRACTS
• SENSORY
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TYPES OF NEURONS
• FIRST ORDER
• SECOND ORDER
• THIRD ORDER
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FIRST ORDER NEURON
• PERIPHERAL PORTION OF ITS NERVE FIBER IN SPINAL CORD
• CELL BODY IN DORSAL ROOT GANGLION
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SECOND ORDER NEURON
• CELL BODY LOCATED IN SPINAL CORD OR MEDULLA
• CONNECTS FIRST ORDER WITH CELL BODY OF THIRD ORDER
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THIRD ORDER NEURON
• CELL BODY LOCATED IN THE THALAMUS
• CONNECTS TO CEREBRAL CORTEX
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DECUSSATION OF SENSORY INPUT
• CROSS AT LEVEL OF ENTRY
• CROSS A FEW SEGMENTS ABOVE
• CROSS IN THE MEDULLA
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MAJOR ASCENDING TRACTS
• FASCICULUS GRACILIS
• FASCICULUS CUNEATUS
• SPINOTHALAMIC TRACTS
• SPINOCEREBELLAR TRACTS
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FASCICULUS CUNEATUS
• LATERAL TO FASCICULUS GRACILIS
• UPPER LIMBS, TRUNK AND NECK
• PROPRIOCEPTION
• FINE TOUCH LOCATION
• TERMINATES IN NUCLEUS CUNEATUS
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FASCICULUS GRACILUS
• MEDIAL TO FASCICULUS CUNEATUS
• LOWER LIMBS
• PROPRIOCEPTION
• FINE TOUCH LOCATION
• TERMINATES IN NUCLEUS GRACILIS
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MEDIAL LEMNISCUS
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SPINOTHALAMIC TRACTS
• SYNAPSE IN THALAMUS
• LATERAL SPINOTHALAMIC
• ANTERIOR SPINOTHALAMIC
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LATERAL SPINOTHALAMIC TRACTS
• PAIN • TEMPERATURE
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ANTERIOR SPINOTHALAMIC TRACTS
• TOUCH
• PRESSURE
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SPINOCEREBELLAR TRACTS
• POSTERIOR CEREBELLAR TRACTS
• ANTERIOR SPINOCEREBELLAR TRACTS
• PROPRIOCEPTION• SYNAPSE IN
CEREBELLUM
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DESCENDING TRACTS
• MOTOR
• PYRAMIDAL TRACTS
• EXTRAPYRAMIDAL TRACTS
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PYRAMIDAL TRACTS
• CORTICOSPINAL TRACTS
• UPPER MOTOR NEURONS
• LOWER MOTOR NEURONS
• LATERAL CORTICOSPINAL TRACTS
• ANTERIOR CORTICOSPINAL TRACTS
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EXTRAPYRAMIDAL TRACTS
• RUBROSPINAL TRACTS
• VESTIBULOSPINAL TRACTS
• TECTOSPINAL TRACTS
• OLIVOSPINAL TRACTS
• FUNCTIONS OVERLAP
• MODIFY CONTRACTIONS DEALING WITH POSTURE AND BALANCE
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RUBROSPINAL TRACT
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VESTIBULOSPINAL TRACT
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TECTOSPINAL TRACT
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OLIVOSPINAL TRACT
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SPINAL REFLEX ARC
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COMPONENTS OF A SPINAL REFLEX ARC
• RECEPTOR• SENSORY (AFFERENT) NEURON• INTEGRATING CENTER• MOTOR (EFFERENT) NEURON• EFFECTOR
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MONOSYNAPTIC VS POLYSNAPTIC
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STRETCH REFLEX
• PATELLAR REFLEX• RECIPROCAL
INHIBITION• RECIPROCAL
INNERVATION
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PATELLAR REFLEX
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TENDON REFLEX
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NEURON POOLS
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SPINAL DYSFUNCTIONS
• PARALYSIS
• LESIONS OF THE SPINAL CORD
• TABES DORSALIS
• POLIOMYELITIS
• SYRINGOMYELIA
• MULTIPLE SCLEROSIS
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PARALYSIS
• MONPELEGIA
• DIPLEGIA
• PARAPLEGIA
• HEMIPLEGIA
• QUADREPLEGIA
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COMPLETE TRANSECTION
• CORD IS SEVERED COMPLETELY
• ALL SENS
• ORY AND MOTOR FUNCTION BELOW IS LOST
• EXTENT OF PARALYSIS DEPENDS ON LEVEL WHERE TRANSECTION OCCURS
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HEMISECTION
• PARTIAL TRANSECTION– ON ONE SIDE OR OTHER
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FLACCID VS SPASTIC PARALYSIS
• FLACCID
• NO MOVEMENT
• SPASTIC
• EXAGGERATED, UNCONTROLLED MOVEMENTS
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EFFECTS OF LESIONS IN THE SPINAL CORD
• DAMAGE IS LOCATED BY IDENTIFYING COMBINATIONS OF LOSS OF FUNCTION
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POLIOMYELITIS
• VIRAL DISEASE• DESTROYS MOTOR NERVE CELL BODIES
IN ANTERIOR HORNS• ESPECIALLY IN CERVICAL AND LUMBAR
ENLARGMENTS• CAN LEAD TO RESPIRATORY OR HEART
FAILURE IF VIRUS INVADES NERVE CELLS IN MEDULLARY CENTERS
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TABES DORSALIS
• SEQUELAE OF SYPHILIS
• POSTERIOR FUNICULI AND DORSAL ROOTS DEGENERATE
• ATAXIA
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SYRINGOMYELIA
• SMALL FLUD FILLED CYSTS FORM IN GRAY MATTER OF SPINAL CORD, BRAIN STEM
• EPENDYMAL CELLS IN CENTRAL CANAL PROLIFERATE
• PRODUCES SENSORY DYSFUNCTIONS
• MOTOR WEAKNESS
• MUSCLE ATROPHY
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MULLTIPLE SCLEROSIS
• CHRONIC DESTRUCTION OF MYELIN SHEATHS
• PLAQUES INTERFER WITH NORMAL NERVE TRANSMISSION
• AUTOIMMUNE DISORDER• VIRUS MAY TRIGGER• SYMPTOMS VARY DEPENDING ON
WHERE DAMAGE OCCURS
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ENCEPHALITIS VS MYELITIS
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MENINGITIS
• INFLAMMATION OF MENINGES
• CAUSES MAYBE FUNGAL, BACTERIAL AND VIRAL