Related Anatomy UNIT 7 Peripheral NERVOUS SYSTEM.

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Related Anatomy UNIT 7 Peripheral NERVOUS SYSTEM

1. Name the 2 DIVISIONS of the Peripheral Nervous System CENTRAL brain and spinal cord PERIPHERAL all nerves outside brain and spinal cord 2 branches Somatic- nerves that serve skeletal system and sense organs Autonomic- serve smooth muscles and heart

The 3 parts of a neuron Dendrite- conduct impulse toward cell body Axon- conduct impulse away from cell body Cell body motor sensory

More on Nerve cells PNS axons and dendrites may be coated with a MYELIN Sheath(this speeds conduction)(White matter) Gaps between axons and dendrites are called Synapses

NERVE IMPULSE Sodium and Potassium Pump POLARIZE DEPOLARIZE REPOLARIZE Note where charges are and where Sodium and Potassium are in relation to nerve cell

Nerve Impulse 1 2 3

REFLEX An automatic, involuntary response Examples, heartbeat, breath, swallow, sneeze, vomit

2. 12 Pair of Cranial Nerves V Trigeminal- teeth V!! Facial- face IX Glossopharyngeal- swallow XII Hypoglossal- tongue

3. 31 Pr of Spinal Nerves Cervical Plexus- head, neck, shoulders, upper chest Brachial- shoulder, arm, hand Lumbar- lower abdominal, thigh, buttock, genitals Sacral- thigh, leg, foot

4. 2 Divisions of the ANS SOMATIC Voluntary nerves that serve muscle and bone AUTONOMIC Involuntary nerves that serve internal organs 2 branches Sympathetic - emergency fight or flight Parasympathetic - normal at rest

Vocab Efferent- motor Afferent- sensory Myelin sheath- coating on PNS nerves,born with none, form as we develop, must have to toilet train. Common disorder- MS Synapse- gap where axons and dendrites meet but do not touch. Impulse may need neurotransmitter to cross this space. Common diseases- Parkinsons, Huntington, Alzheimers Ganglia- mass of nerve cells outside CNS

Vocab Continued White Matter- covered in Myelin Grey Matter- no Myelin Meninges- protective covering of brain and spinal cord. Disease- Meningitis CSF- cerebrospinal fluid, clear CNS- central nervous system PNS- peripheral nervous system ANS- autonomic nervous system

The End

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