Chapter 11 Vocab Flashcards Preview

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Flashcards in Chapter 11 Vocab Deck (86)
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Cranial nerves

12 pairs. Originate from brain

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Spinal nerves

Originate from spinal cord. 31 pairs

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Ganglion

Collection of neuron cell bodies located outside CNS

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Plexus

Extensive network of axons sometimes neuron cell bodies outside CNS

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Subdivisions of PNS

Sensory division and motor division

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Sensory division

Afferent -toward brain

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Motor division

Efferent. Away from brain to organs

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Motor division subcategories

Somatic and autonomic

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Autonomic nervous system (ANS) subcategories

Sympathetic and parasympathetic division

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Sympathetic division

Active during physical activity

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Parasympathetic division

Regulates resting functions. Digestion empty urine

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Enteric nervous system

Plexus within digestive tract. Control independently from CNS

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Neuroglia

Supportive cells, protect neurons. Accounts for more than half brains weight.

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Axons

Nerve fibers

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Nissl bodies

Primary site of protein synthesis in neurons.

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Dendritic spines

Receive input from other neurons axons and environment

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Axon hillock

Most neurons; single axon arises from a cone shaped area of. Neuron cell body

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Initial segment

Beginning of the axon

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Trigger zone

Action potentials generated

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Axoplasm

Cytoplasm of an axon

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Axolemma

Axon plasma membrane

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Types of neurons

Sensory, motor, interneurons, bipolar neurons, multipolar neurons, pseudo-unipolar neuron

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Interneurons

Conduct action potentials within CNS

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Multipolar neurons

Many dendrites and single axon. Most in CNS and motor

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Bipolar neurons

Two processes; one dendrite one axon. Received stimulus-- retina and nasal cavity

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Pseudo-Unipolar neurons

Single process extends from cell body. Sensory receptors

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Neuroglia of CNS

Astrocytes, ependymal cells, microglia, oligodendrocytes

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Neuroglia of the PNS

Schwann cells, satellite cells

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Astrocytes

Star shaped. Cytoplasmic processes extend to form foot processes

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Foot processes

Astrocytes. Spread out and cover blood vessels, neurons and pia matter