The Anatomy of the Anatomic Nervous System Flashcards
What are the 2 anatomical divisions of the nervous system
- Central
- Peripheral
What are the 2 functional divisions of the nervous system
- Somatic and Autonomic
What are the 2 directional divisions of the nervous system
- Afferent
- Efferent
What synapses with CNS cell bodies
Somatic afferents found in the dorsal horn
What synapses with cell bodies and axons
Somatic efferent found in the ventral horn
Where is the lateral horn found and what does it contain
- Found in the thoracic and lumbar regions
- Contains pre-ganglionic sympathetic cell bodies
Where is the anterolateral horn found and what does it contain
- Found in the sacral region
- Contains pre-ganglionic parasympathetic cell bodies
THE ANS
SLIDE 6
Are pre and post ganglionic fibres myelinated or unmyelinated
- Pre-ganglionic are myelinated
- Post-ganglionic are unmyelinated
What is the primary neurotransmitter for pre-ganglionic fibres
Acetylcholine - ACh (they are also known as cholinergic fibres)
What are the primary neurotransmitters for post-ganglionic fibres
- Acetylcholine (ACh) - Cholinergic fibres
- Noradrenaline (NA) - Adrenergic fibres
How do General Visceral Afferent fibres send sensory information back to the CNS
Via the dorsal root and horn
How do visceral and autonomic afferent fibres travel
in the same way as somatic afferent fibres
Where are neuronal cell bodies located
In specific sensory nerve ganglia of the cranial nerves or dorsal root of ganglia.
What supplies cutaneous innervation to a specific region of the skin
Afferent fibres from spinal nerves
What is a dermatome map
A map that identifies the regions innervated by a particular spinal nerve
What is visceral or referred pain
Pain in visceral organs interpreted in a region innervated by the same spinal segment
What are somatic efferent fibres made up of
A single neurone which consists of a single neurone which synapses with skeletal muscle
How many neurone pathways do GVE fibres or autonomic efferent fibres consist of
2
What do pre-ganglionic fibres synapse with
Ganglia
What do post-ganglionic fibres synapse with (3 things)
- Cardiac muscle
- Smooth muscle
- Gland cells
What is a myotome
Similar to dermatome but highlights the skeletal muscles innervated by a specific spinal nerve rather than the skin.
How many spinal cord levels are the nerves that innervate skeletal muscles usually from
Multiple spinal cord levels
