Lecture 14: Intro to Visceral NS Flashcards
NERVOUS SYSTEM PATHWAYS
where are somatic cell bodies found?
ventral horn
where are sensory cell bodies found?
dorsal root ganglion
Dorsal Rami innervate what muscle type
epaxial muscles
Ventral Rami innervate what muscle type
hypaxial muscles
what are epaxial muscles?
those found along the spine, the intrinsic muscles of the back and neck
they support the vertebral column and are a major part of locomotion
- ilocostalis
- longissimus
- transversospinalis
what are hypaxial muscles?
muscles that function in LIMB movement and stability
- ex: trapezius, latissimus dorsi,l serratus dorsalis
what is the most superficial epaxial muscle in the cervical (neck) region
semispinalis cervics
where are somatic motor cell bodies found?
ventral horn
where are sensory cell bodies found
dorsal root ganglion
the dorsal and ventral roots are joined into the _____ spinal nerve
mixed
what 3 visceral structures are present in the body wall
- sweat & sebaceous glands
- arrector pili muscles
- vasculature
the lateral horn houses preganglionic sympathetic cell bodies from what spinal cord levels
T1-L4 only
where are postganglionic sympathetic cell bodies contained?
paravertebral ganglion
if postganglionic axons are going to innervate something in the body wall where does synapse occur
paravertebral ganglion
where can PREganglionic cell bodies of the sympathetic nervous system be found
ONLY from T1-L4 spinal cord levels
where can POSTganglionic cell bodies of the sympathetic nervous system be found
EVERY vertebral level
- thanks Cadua Equina
the spinal cord ends in the _______
conus medullaris
what is the name for the line up of all the paravertebral ganglia
sympathetic chain / trunk
at what spinal cord levels do preganglionic sympathetic axons enter the sympathetic chain
T1-L4
at what spinal cord levels are white ramus communicantes located
T1-L4
where can preganglionic axons have synapse occur
- paravertebral ganglion of that level
- move cranially in the chain
- move caudally in the chain
- exit the chain so they can synapse in a prevertebral ganglion (located at the base of arteries)
what levels of the sympathetic chain can postganglionic axons exit
at all levels
what levels of the sympathetic chain can gray rami communicantes be found
every level
is the spinal cord the same length as the vertebral column?
no it is shorter
- this is why spinal nerve levels and vertebral levels do not match in adult animals
what structures can be found in paravertebral ganglion at EVERY level
- somatic motor cell bodies in the ventral horn
- visceral and somatic sensory cell bodies in the dorsal root ganglion
- postganglionic sympathetic cell bodies in the paravertebral ganglion
- gray ramus communicans
- connection to the paravertebral ganglion above and below
what structures can be found in paravertebral ganglion from levels T1-L4
**preganglionic sympathetic cell bodies in the lateral horn
**white ramus communicans
all paravertebral ganglia from the superior cervical ganglion to T5 are attached to ________ nerves
cardiopulmonary splanchnic nerves
all paravertebral ganglia from T5-T6 are attached to _____ nerves
Abdominopelvic splanchnic nerves
what 6 structures can be found attached to the T5 paravertebral ganglion
- abdominopelvic splanchnic nerve
- cardiopulmonary splanchnic nerve
- gray ramus
- white ramus
- connection to T4
- connection to T6
***T5 is the only paravertebral ganglion with both a cardiopulmonary and abdominal pelvic splanchnic nerve
what structures are missing at vertebral levels caudal to L4?
- no lateral horn
—> no preganglionic sympathetic cell bodies - no white ramus communicans
what axons are found in each portion of the spinal nerve complex
where is the one cell body for visceral pain found
dorsal root ganglion
what pathway does visceral pain follow
sympathetic pathway
what pathway does visceral non-pain follow
parasympathetic
What does splanchnic mean
a visceral structure in the body cavity
