Visual
Anatomical divisions
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PNS
CNS
- Brain + spinal cord
- Integrating, processing + coordinating sensory data + motor commands
- Higher fucntions
- All neural tissue EXCEPT brain + spinal cord
- Delivers sensory info to CNS and moror demans to peripheral tissues + systems
Efferent
Afferent
- Sensory info to CNS from receptors in peripheral tissues + organs
- Carry motor commannds from CNS to miscles + glands
Somatic nervous system
- Skeletal contractions
Autonomic nervous system
- Smooth muscle, cardiac muscle + glandualr secretions
Parasympathetic division
Sympathetic Division
Sympathetic chain ganglia
Ganglion synapses on sympathetic chain
Thoracic
Lumbar
Cervical
Sacral
3: Superior, middle + inferior
T2-T11 (thoracolumbar outflow)
Short pre-ganglionic
CNS - PNS - Target
Splanchnic Nerves
- Abdominopelvic viscera with sympathetic innervation
- Preganglionic fibres pass through sympathtic chain without synapsing
- Synapse in separate collateral ganglia
- Postganglionic fibres leave collateral ganlia: innervate visceral tissues + organs within abdominopelvic cavity
Three splanchnic nerves
Lesser splanchnic Nerve
Least Splanchnic nerve
Greater Splanchnic nerve
- T5- T9
- Synapse coeliac ganglion
- Supplies foregut viscera
- T10
- Aorticorenal ganglion
- Midgut viscera
- T12
- Renal ganglion
- Kidneys + upper ureter
PSNS
CN 3, 7, 9 and 10
Craniosacral outflow (Brainstem + Lateral horn grey matter S2-S4)
- Preganglionic neurons in brain stem + sacral segments of spinal cord
- Within or adjacent target organs
- Contrast sympathetic division: neurons within ganglion all have same target organ + do not mix with neurons within other ganglia
- Long preganlgionic fibres + short postganglionic fibres