Exam 2 Study Guide 5 Flashcards
Demarcation between PNS and CNS
CNS: encased in bone
PNS: not in bone
How are peripheral nerves constructed?
parallel bundles of axons surrounded by 3 sheaths
3 sheaths
- endoneurium
- perinerium
- epineurium
*mesoneurium outside of that
What supplies blood to the peripheral nerves?
Arterial branches that enter the nerve trunk
What structures are supplied by peripheral nerves?
- visceral
- somatic structures
somatic peripheral nerves
usually mixed, consisting of sensory, autonomic, and motor axons
cutaneous branches of peripheral nerves supply
- skin
- subcutaneous tissues
muscular branches of peripheral nerves supply
- muscles
- tendons
- joints
4 nerve plexuses
- cervical
- brachial
- lumbar
- sacral
movement and nerve health
promotes flow of blood through nerves and axoplasm
nerve movements and sheaths
- fascicles glide within the nerves
- nerves glide along with other structures
myopathy
disorder intrinsic to muscles
What remains intact with myopathies?
- sensation
- autonomic function
When is coordination, muscle tone, and reflexes affected with a myopathy?
only when atrophy is so severe that muscle activity can’t be elicited
pins and needles sensations increase with
severity of neuropathy