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Chapter

NROC90H3 Chapter Notes -Dorsal Root Ganglion, Central Nervous System, Posterior Column


Department
Neuroscience
Course Code
NROC90H3
Professor
George Cree

Page:
of 11
Neuroanatomy (Overview + Spinal Cord) 02/06/2009
19:17:00
Shared Characteristics of Vertebrate NSs
Pattern of neural development (order)
Bilateral symmetry
Cross connectivity (right controls left)
Longitudinal organization (structures posterior develop first)
Dorsal (back)/ventral organization of sensory/motor function
Anatomical References
Dorsal vs. ventral
Rostral vs. caudal
Anterior vs. posterior (bipeds)
Medial (towards midline) vs. lateral (away from midline)
Ipsilateral (on same side) vs. contralateral (on opposite)
Planes of section
Cornal or frontal (rostral from caudal, like bread)
Sagittal (seperates left from right)
Horizontal (dorsal from ventral)
Divisions of the NS
CNS
oBrain
oSpinal cord
PNS
oAutonomic NS
Afferent nerves (carry information to structure)
Efferent nerves (carry information away structure)
Parasympathetic
Sympathetic
oSomatic NS
Afferent nerves
Efferent nerves
Nerve/Tract
oVerves are bundles of axons within the CNS
oTracts are bundles of axons within the CNS
CNS vs. PNS
CNS is the brain and spinal cord
PNS includes
oSpinal nerves
oCranial nerves
oPeripheral ganglia
Peripheral Nervous System (PNS)
Autonomic Nervous System
oANS is considered “Self-governing”
oInnervations of internal organs
Receives sensory input from internal organs
Sends motor commands to internal organs
oTwo parts with opposing effects
Sympathetic
Active during emergencies
Fight-or-flight responses
Parasympathetic
Active when calm
Digestion, growth, energy storage
Somatic Nervous System
oSpinal nerves innervating skin, joints, striated muscle
Mixed motor/sensory; split up before reaching cord
oDorsal root: sensory afferents enter cord
Somata outside cord, in dorsal root ganglia
oVentral root: motor efferent exit cord
Somata in ventral horn
Neurulation
Embryo is a flat disc with 3 layers:
oEndoderm: lining of internal organs
oMesoderm: bones, muscles