Periperal Nervous System (PNS)

Question 1

organs associated with the PNS

Answer 1

Cranial nerves, spinal nerves, ganglia, enteric plexuses in small intestine, sensory receptors

Question 2

Cranial Nerves:

Answer 2

• carries motor signal to lungs, heart, digestive organs

- 12 pairs that emanate from the brain

Question 3

Spinal Nerves:

Answer 3

• connect the CNS to sensory receptors, muscles, and glands and are part of the PNS
• dual function
• 31 pairs
• dorsal roots - sesnory neurons
• ventral roots - motor neurons

Question 4

Structure of Nerve

Answer 4

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Question 5

Nerve Plexuses:

Answer 5

• redistributes fibres from spinal nerves into new peripheral nerves
• Ensures that target receives their supply of neurons from several spinal nerves
• Helps prevent total loss of motor and sensory function if a spina nerve is damaged

Question 6

neurons and electrical impulses

Answer 6

Information enters through the dorsal roots and leaves through the ventral root
The command/motor response can either be somatic (goes to skeletal muscles) or autonomic (goes to organs)

Question 7

Autonomic Nervous System (ANS) is divided into

Answer 7

• Sympathetic:

- Parasympathetic

Question 8

Sympathetic Nervous System

Answer 8

• Sympathetic motor neurons exit the CNS via thoracic and lumbar regions of the spinal cord
• Second motor neuron uses noradrenalin as the neurotransmitter to stimulate target tissue

Question 9

Parasympathetic Nervous System

Answer 9

• motor neurons exit the CNS via the brainstem & spinal cord

- major neurotrasmitter: acetylchline

Question 10

Sympathetic Motor Neuron Pathway (S-AN)

Answer 10

1st neurotransmitter released in the ganglion: Acetylcholine, target tissue neurotransmitter released: Noradrenaline

Question 11

Parasympathetic Motor Neuron Pathway (P-AA)

Answer 11

1st neurotransmitter released in the ganglion: Acetylcholine, target tissue neurotransmitter released: Acetylcholine