Flashcards in Intro to Nervous System Deck (13):
Organization of Nervous System
Central NS: Brain and Spinal Cord
Peripheral NS: Spinal nerves, Cranial nerves (III-XII), Ganglia (Dorsal root ganglia & autonomic ganglia)
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
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.
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).
The Axons of neurons in CNS form________.
The neuronal cell bodies in PNS are _____
in Ganglia. eg. Dorsal root ganglia, Cranial nerve ganglia, autonomic ganglia.
Neuronal Cell Bodies in CNS are ______
Somatic Nervous System
Voluntary control (skin/sensation, bones, muscles)
AKA. Voluntary Nervous System
Composed of Voluntary Motor (Efferent) and Somatic Sensory (Afferent) axons
Voluntary Motor Axon
Efferent Axon of Somatic Nervous System.
Axons are called General Somatic Efferent (GSE).
Sends motor signals to the extremities
Somatic Sensory Axon
Afferent Axon of SNS
Axons are called General Somatic Afferent (GSA).
Carry nerve impulses in and process sensory info
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
Visceral Motor Axon
Efferent Axon of ANS.
Axons are called General Visceral Efferent (GVE)
Sends signals of response out to necessary organs.