Week 9: ANS Flashcards
Cell bodies of afferent neurons below the head regions are located within
Bilateral dorsal root ganglia
Cell bodies of efferent neurons are located
Within nuclei, which make up the grey matter of the CNS
Another name for autonomic neurons
Visceral efferent neurons
Where are interneurons located
In the CNS
Interneurons travel along
Tracts, which comprise the majority of the CNS white matter
Ascending tracts extend
From the spinal cord to the brain
Descending tracts extend
From the brain to the spinal cord
Association neurons
Interneurons from one brain region to another
Unconscious integration occurs
at the spinal cord
Conscious integration occurs
at the brain
Ganglion
Collection of neuron cell bodies located within the PNS
Cell bodies of efferent neurons are always located
In the CNS and form aggregations with other efferent cell bodies within the CNS
Nucleus
Aggregations of neuron cell bodies within the CNS
Mixed nerve
Comprised of both sensory neuron fibers and motor neuron axons
Pre-synaptic/ganglionic neuron cell body is located
In the CNS (brain nucleus/spinal cord gray matter)
Post synaptic/ganglionic neuron cell body is located
Within an autonomic ganglion, outside of CNS
How many cranial nerves do mammals have?
12
What cranial nerves have autonomic neurons?
- Oculomotor (CN III)
- Facial (CN VII)
- Glossopharyngeal (CN IX)
- Vagus (CN X)
Sympathetic division is also called
Thoracolumbar division
Parasympathetic division is also called
Craniosacral division
Sympathetic generally synapse
Within the sympathetic chain ganglia
Parasympathetic generally synapse on
Ganglia in organs they innervate
Pre-synaptic cell bodies of SNS neurons are located
In the thoracic and lumbar regions of the spinal cord
Splanchnic nerves
- Communicate with pre-vertebral ganglia
- Comprised of pre-synaptic SNS axons that don’t synapse within the paravertebral chain
Three splanchnic ganglia
- Celiac ganglion: Near celiac artery
- Cranial mesenteric ganglion: Near cranial mesenteric artery
- Caudal mesenteric artery: Near caudal mesenteric artery
Celiac and cranial mesenteric together are called
Celiacomesenteric ganglion plexus
Pre SNS neurons that extend cranially to supply structures within the head and thorax synapse onto what post-SNS cell bodies
- Cervicothoracic ganglion
- Middle cervical ganglion
- Cranial cervical ganglion
Vagus nerve carries
Pre-PSNS axons from brain to thorax and abdomen
Vagosympathetic trunk is composed of
- Pre-SNS axons that extend cranially and synapse in cranial cervical ganglion
- Pre-PSNS axons extending caudally and that synapse on terminal ganglia
Do the branches of the ANS have origins from the cervical region of the spinal cord?
Nope
How many synapses can occur with SNS and PSNS before synapsing on target tissue?
One
Visible autonomic ganglia must contain…
because…
Post-synaptic neuron cell bodies
Pre-synaptic are always in the CNS
