HUBS1403 Lecture Notes - Lecture 22: Cytoskeleton, Endocrine System, Neuromuscular Junction
8 Jun 2018
School
Department
Course
Professor
Overview of the Nervous System
Basic Functions of the Nervous System
• Collects information from internal and external environment
• Process the info; integrates with store info
• Sends "motor" commands to "effectors"
Basic Goals of the NS
• Maintain homeostasis
• Satisfy primary drives (thirst, hunger, sex etc)
Organisation of NS
Major
Parts
Subdivisions
Central nervous system
(CNS)
brain and spinal chord
Peripheral nervous
system (PNS)
connect the spinal cord and brain to
various parts of the body
• enteric (ENS)
• Somatic (SNS)
• Autonomic (ANS)
• Parasympathetic
• Sympathetic
Major
What it does
Divisions
Further Divisions
Further Divisions
CNS
Is responsible
for integrating,
processing and
coordinating
sensory data
and motor
commands
Brain - Complex
integrative functions:
vision, hearing,
consciousness,
memory
Spinal Column - Relays
info to the brain,
detects simple
involuntary activities
such as reflexes
PNS
Transmits
sensory info to
the CNS and
delivers motor
commands to
peripheral
organs
Receptors
• Visceral -
(interoceptors)
internal conditions
and status of organ
systems eg
cardiovascular
system, digestive
system, pain
• Somatic - position
and movement of
muscle and joints
and skin (monitor
outside work and
our position in it)
Divisions of
Efferent
• Somatic NS
(SNS)
(innervate)
skeletal
muscles. It has
voluntary and
involuntary
(reflex) aspects
• Autonomic
(visceral) NS
(ANS)
innervated
everything
Divisions of ANS
• Sympathetic
• Parasympathetic
Divisions provide opposing
control over organs in
order to maintain
homeostasis. Specific
controls vary from organ
to organ
Eg. Sympathetic speeds HR
while parasympathetic
slows it
Document Summary
Basic functions of the nervous system: collects information from internal and external environment, process the info; integrates with store info. Basic goals of the ns: maintain homeostasis. Central nervous system (cns) brain and spinal chord. Peripheral nervous system (pns) connect the spinal cord and brain to various parts of the body: enteric (ens) Is responsible for integrating, processing and coordinating sensory data and motor commands. Transmits sensory info to the cns and delivers motor commands to peripheral organs. Brain - complex integrative functions: vision, hearing, consciousness, memory. Spinal column - relays info to the brain, detects simple involuntary activities such as reflexes. Receptors: visceral - (interoceptors) internal conditions and status of organ systems eg cardiovascular system, digestive system, pain. Somatic - position and movement of muscle and joints and skin (monitor outside work and our position in it) It has voluntary and involuntary (reflex) aspects: autonomic (visceral) ns (ans) innervated everything.
