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PERIPHERAL NERVE SYSTEM
1. Spinal ganglia
2. Peripheral nerve
3. Nerve endings
4. Spinal cord
5. Meninges
NERVE ENDINGS
NERVE ENDINGS
SENSORY (receptors)
A. Disposition: 1. Interoceptors
2.
Proprioceptors
3.
Exteroceptors
B. Feelings: 1. Pain
2. Pressure
3.
Temperature…
C. Structure: 1. Simple (free)
2.
Compound (nonfree):
encapsulated, noncapsulated
SYNAPSES (chemical and electric)
Structure
Functions: excitatory, inhibiting
Mediator: acetylcholine, adrenalin, bombesin …
III. EFFECTORY (effectors)
Motor
Secretory
Peripheral nerve
Nerve
Spinal ganglion
NERVE ENDINGS
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•
•
SENSORY (receptors)
A. Disposition: 1. Interoceptors
2. Proprioceptors
•
3. Exteroceptors
B. Feelings: 1. Pain
•
•
2.
Pressure
•
Temperature…
C. Structure: 1. Simple (free)
•
•
2.
Compound (nonfree):
encapsulated, noncapsulated
SYNAPSES (chemical and electric)
•
–
–
–
•
•
•
3.
Structure
Functions: excitatory, inhibiting
Mediator: acetylcholine, adrenalin, bombesin …
EFFECTORY (effectors)
Motor
Secretory
Paccinian body
Synapses
Spinal cord
SPINAL CORD
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•
Gray matter: H-like inside, nerve cells aggregations
(nuclei)
White matter: outside, columns of nerve fibers
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•
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Types of nerve cells
Radicular – axons form the anterior root
Funicular– axons form the white matter funiculi
Inner – axons lie in gray matter
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Ventral horn of gray matter:
5 nuclei – multipolar motor radicular neurons
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•
Lateral horn:
Nucleus intremediolateralis – multipolar associative
radicular neurons
Nucleus intremediomedialis – multipolar
associative funicular neurons
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•
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•
Dorsal horn :
Nucleus proprius – multipolar associative funicular
neurons
Nucleus thoracicus– multipolar associative
funicular neurons
MENINGES
• 3 protective coats of CNS: dura, arachnoid
and pia
• Skull bone
• Periosteum of skull
• epidural space
• DURA MATER – dense connective tissue
• epithelium
• subdural space
• ARACHNOID – flat epithelium
• fibrocollagenous tissue
• web-like strands
• subarachnoid space
• PIA MATER – squamous epithelium
•
– loose connective tissue with
blood vessels and nerve fibers
• Basement membrane
• Glia limitans (astrocytes)
• Nerve tissue