PERIPHERAL NERVE SYSTEM

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Presentation transcript:

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 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 … EFFECTORY (effectors) Motor Secretory

Paccinian body

Synapses

Spinal cord

SPINAL CORD Gray matter: H-like inside, nerve cells aggregations (nuclei) White matter: outside, columns of nerve fibers Types of nerve cells Radicular – axons form the anterior root Funicular– axons form the white matter funiculi Inner – axons lie in gray matter Ventral horn of gray matter: 5 nuclei – multipolar motor radicular neurons Lateral horn: Nucleus intremediolateralis – multipolar associative radicular neurons Nucleus intremediomedialis – multipolar associative funicular neurons 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