PCOL sympathetic!!

• Preganglionic fibers are myelinated, while post-ganglionic fibers are unmyelinated
• Sensory neurons carry information from receptors to CNS
• The sympathetic nervous system is responsible for the body's fight or flight response.
• The SNS has preganglionic neurons that synapse with post ganglionic neurons
• Brain receives and processes sensory information, initiates responses, stores, and memories, generate thoughts and emotions.
• Parts of the brain

  1. Cerebrum
  2. Cerebellum
  3. Spinal Cord
• Cerebrum has two parts:

  1. Telencephalon
  2. diencephalon
• Cerebrum is responsible for initiation and coordination of movement, temperature, touch, vision, hearing, judgement, emotions, and learning.
• Cerebellum receives information from the sensory systems and spinal cord. Also reulates motor movements.
• Spinal cord conducts signal to and from the brain. Also controls reflex activities.
• Damage to spinal cord results to paralysis.
• Spinal cord has two parts:

  1. White Matter
  2. Grey Matter
• White matter has lipid components responsible for its light color
• White matter consists mainly of myelinated axons
• White matter is responsible for the afferent and efferent pathways.
• Afferent pathway is relaying information to the brain.
• Efferent pathway relays informaton from the brain to the body
• Greymatter consists capillaries which makes the tissue dark. It also consists soma (nerve cell bodies) and branching dendrites
• Grey matter's role is to respond to information from the PNS, and control the senses of the body.
• The spinal cord has three main regions; cervical region, thoracic region, lumbar region
• Grey matter is butterfly-shaped.
• Peripheral Nervous System consists of:

  1. Spinal Nerves
  2. Cranial Nerves
  3. Ganglia or periphery nerves
• role of PNS is to transmit and receive information from the CNS.
• Neurons carry signals away from the brain, then to the spinal cord, then to peripheral tissuues.
• Efferent motor portion's pathway is from CNS to muscle glands.
• Autonomic nervous system controls the involuntary movements.
• Autonomic nervous system is largely independent and is no under direct conscious control.
• Parasympathetic division restores normal function when stressful situation ends.
• Sympathetic division prepares body for fight or flight response.
• Autonomic nervous system is primarily concerned with visceral functions such as: blood flow distribution, cardiac output, sexual arousal, and digestion.
• Sympathetic Nervous system is for fight or flight response of the body.
• Parasympathetic nervous system, however, is responsible for Rest and Digestion of the body.
• The GIT has its own nervous system known as the Enteric Nervous System.
• 3 characteristics of Autonomic NS:

  1. Ganglia
  2. 2 neuron System
  3. Synapse
• 2 neurotransmitters involved in the Autonomic Nervous system are Norephinephrine and Acetylcholine
• Two ganglionic fibers of autonomic NS are: pre and post
• 3 receptors involved in the Autonomic Nervous System are:

  1. Nicotnic
  2. Cholinergic/Muscarinic
  3. Adrenergic
• Somatic Nervous System controls the voluntary movements of skeletal muscles.
• Somatic nervous system is concerned with consciously controlled functions like movement.
• Sympathetic Nervous System is also known as Adrenergic Nervous System