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Flashcards in Intro to Nervous System Deck (13):
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Organization of Nervous System

Central NS: Brain and Spinal Cord

Peripheral NS: Spinal nerves, Cranial nerves (III-XII), Ganglia (Dorsal root ganglia & autonomic ganglia)

1

How many pairs of spinal nerves are there and provide a breakdown of the segments

31 Total Spinal Nerves:
- 8 Cranial
- 12 Thoracic
- 5 Lumbar
- 5 Sacral
- 1 Coccygeal

2

Where does the Spinal Cord end? What is the term for the structure that follows it?

Spinal Cord ends at the Lumbar region (Conus Medularis).

Cauda Equina is the horse-tail like structure that consists of spinal nerves that continue past conus medularis.

3

The Axons of neurons in PNS form _________.

Nerves. These nerves can then interconnect to form Plexi (eg. brachial plexus, cranial plexus, lumbar plexus, sacral plexus).

4

The Axons of neurons in CNS form________.

Tracts

5

The neuronal cell bodies in PNS are _____

in Ganglia. eg. Dorsal root ganglia, Cranial nerve ganglia, autonomic ganglia.

6

Neuronal Cell Bodies in CNS are ______

Nuclei

7

Somatic Nervous System

Voluntary control (skin/sensation, bones, muscles)
AKA. Voluntary Nervous System

Composed of Voluntary Motor (Efferent) and Somatic Sensory (Afferent) axons

8

Voluntary Motor Axon

Efferent Axon of Somatic Nervous System.
Axons are called General Somatic Efferent (GSE).
Sends motor signals to the extremities

9

Somatic Sensory Axon

Afferent Axon of SNS
Axons are called General Somatic Afferent (GSA).
Carry nerve impulses in and process sensory info

10

Autonomic Nervous System

Involuntary control (Organs, Glands, Smooth Muscle).
AKA. Visceral Nervous System, Involuntary Nervous system

Controls visceral functions such as heart rate, digestion, respiration, perspiration, etc.

Composed of Sympathetic and Parasympathetic systems

11

Visceral Motor Axon

Efferent Axon of ANS.
Axons are called General Visceral Efferent (GVE)

Sends signals of response out to necessary organs.

12

Visceral Sensory Axon

Afferent Axon of ANS.
Axons are called General Visceral Afferent (GVA)

Sends signals of distress to nervous system