Lymphatic System and Immunity

• What do sensory (afferent) nerves do?

  Carry impulses towards the CNS
• What do motor (efferent) nerves do?

  Carry impulses away from the CNS
• What are the two subsets of nerves in the Peripheral Nervous System?

  • Cranial Nerves
  • Spinal Nerves
• How many pairs of cranial nerves are there?

  12 pairs
• How many pairs of spinal nerves are there?

  31 pairs
• What is the integration center for cranial nerves?

  The brain
• What is the integration center for spinal nerves?

  The spine
• What are the two divisions of the Peripheral Nervous System?

  1. Sensory or Afferent Division
  2. Motor or Efferent Division

  
• What does the sensory division of the PNS do?

  Transmits impulses towards the CNS
• What does the motor division of the PNS do?

  Transmits impulses from the CNS to effectors
• What are the two main systems under the Motor Division?

  1. Somatic Nervous System
  2. Autonomic Nervous System

  
• What does the somatic nervous system control?

  Conscious control of skeletal muscles
• What does the autonomic nervous system control?

  Automatic control of smooth and cardiac muscles
• What are the two branches of the Autonomic Nervous System?

  1. Sympathetic Nervous System
  2. Parasympathetic Nervous System

  
• What do sensory cranial nerves do?

  Go from receptors towards the brain
• What do sensory spinal nerves do?

  Go from receptors to the spinal cord
• What do autonomic cranial nerves do?

  Go from the brain to muscles or glands
• What do autonomic spinal nerves do?

  Go from the spinal cord to muscles or glands
• What do somatic cranial nerves do?

  Go from the brain to skeletal muscles
• What do somatic spinal nerves do?

  Go from the spinal cord to skeletal muscles
• What are the cranial nerves numbered I to XII?

  1. Olfactory

  II. Optic

  III. Oculomotor

  IV. Trochlear

  1. Trigeminal

  VI. Abducens

  VII. Facial

  VIII. Vestibulocochlear

  IX. Glossopharyngeal

  1. Vagus

  XI. Accessory

  XII. Hypoglossal
• What type of nerves are most cranial nerves?

  Mixed nerves with sensory and motor functions
• What do somatic fibers connect to?

  Skin and skeletal muscles
• What do autonomic fibers connect to?

  Smooth and cardiac muscles and glands
• What is the function of the Olfactory nerve?

  Sensory for smell
• What is the function of the Optic nerve?

  Sensory for vision
• What is the function of the Oculomotor nerve?

  Motor to eye muscles
• What is the function of the Trochlear nerve?

  Motor to superior oblique muscle
• What is the function of the Trigeminal nerve?

  Sensory to face, motor for chewing
• What is the function of the Abducens nerve?

  Motor to lateral rectus muscle
• What is the function of the Facial nerve?

  Sensory for taste, motor to face muscles
• What is the function of the Vestibulocochlear nerve?


  Sensory for balance and hearing
• What is the function of the Glossopharyngeal nerve?

  Sensory from tongue, motor for pharynx
• What is the function of the Vagus nerve?

  Sensory and motor for pharynx and viscera
• What is the function of the Accessory nerve?

  Motor to neck and upper back
• What is the function of the Hypoglossal nerve?

  Motor to the tongue
• What is the structure of the sympathetic nervous system?

  • Originates from thoracolumbar spinal cord (T1-L2)
  • Short preganglionic and long postganglionic fibers

  
• What is the structure of the parasympathetic nervous system?

  • Originates from brainstem and sacral spinal cord (S2-S4)
  • Long preganglionic and short postganglionic fibers

  
• What is the function of the sympathetic division?

  Prepares the body for fight or flight
• What is the function of the parasympathetic division?

  Restores the body to resting state