A & P 2 - Class 1 - Intro to the Nervous System Flashcards
What are the three Whole Body Communicating Networks?
Fibrous (fascial) net, neural net, and fluid net.
Define the fibrous (fascial) network.
Communicates mechanical information (pushes and pulls). Essentially a tissue - fascia- that interpenetrates continuously through ALL body structures.
Define the neural network.
Communicates “coded” electrical information.
Define the fluid network.
Communicates chemical information (through blood, lymph, ECF, etc.)
What are the two Control Systems?
Nervous & endocrine.
Define the nervous control system.
Controls other systems through nerve impulses.
Define the endocrine control system.
Controls other systems through hormones released in the blood.
What are the two nervous system subdivisions?
Central Nervous System (CNS) and Peripheral Nervous System (PNS),
The Central Nervous Systems deals with what two parts of the body?
Brain and spinal cord.
The Peripheral Nervous System deals with what part of the body?
All nervous tissue outside the CNS (includes nerves and sensory receptors)
What are the two subdivisions of the Peripheral Nervous System?
Somatic Division of PNS or Somatic Nervous System (SNS) and Autonomic Division of PNS or Autonomic Nervous System (ANS).
Define Somatic Nervous System.
Motor to skeletal muscles (voluntary).
Define Autonomic Nervous System.
Motor to (and sensory from) smooth and cardiac muscle and glands (involuntary and subconscious).
What are the two subdivisions of the Autonomic Nervous System.
Sympathetic and parasympathetic.
Define sympathetic in relation to the ANS.
Fight or flight reaction (or freeze). More powerful of the two subdivisions. Dually innervated with the parasympathetic.
Define parasympathetic in relation to the ANS.
Rest and digest action. Dually innervated with the sympathetic.
What are the two Peripheral Nervous System regional divisions?
Cranial nerves and spinal nerves.
Define cranial nerves in relation to the PNS.
Cranial nerves are based on where nerves arise (these come out from the brain). There are 12 pairs of cranial nerves.
Define spinal nerves in relation to the PNS.
Spinal nerves are based on where nerves arise (these come out from the spine). They are above and below each vertebrae.
What is the major function of the nervous system?
Regulates body activities through nerve impulses.
What are the three major functions of the nervous system?
Sensation (or sensory function), integration, and motor response (or motor function).
Define sensation in relation to the nervous system.
Detection of changes in the body’s internal and external environment.
Define integration in relation to the nervous system.
Processes and interprets sensations.
Define motor response in relation to the nervous system.
Causes muscular contraction or glandular secretion.
