MIDTERM- NERVOUS SYSTEM

• FUNCTION OF NERVOUS SYTEM


  SENSORY

  INTEGRATIVE

  MOTOR
• Division of nervous system

  Central Nervous System

  Peripheral Nervous System
• CNS can be found in:


  brain and spinal cord
• pns can be found in:


  Cranial Nerves, Spinal Nerves, Ganglia, Enteric plexuses in small intestine, sensory receptors in skin
• CRANIAL NERVES

  CN 1: OLFACTORY NERVE

  CN 2: OPTIC NERVE

  CN 3: OCCULOMOTOR NERVE

  CN 4: TROCHLEAR

  CN 5: TRIGEMINAL NERVE

  CN 6: ABDUCENS NERVE

  CN 7: FACIAL NERVE

  CN 8: VESTIBULOCOCHLEAR

  CN 9: GLOSSOPHARYNGEAL

  CN 10: VAGUS NERVE

  CN 11: ACCESSORY NERVE

  CN 12: HYPOGLOSSAL NERVE
• PLEXUS


  CERVICAL PLEXUS

  BRACHIAL PLEXUS

  LUMBAR PLEXUS

  SACRAL PLEXUS

  COCYGEAL PLEXUS

  ENTERIC PLEXUS
• ENTERIC PLEXUS


  AUERBACH'S PLEXUS/ MYENTERIC (MOTOR)

  MEISNNER'S PLEXUS/ SUMUCOSAL (GLANDULAR)
• TRACTS

  ASCENDING TRACTS

  DESCENDING TRACTS
• TRACTS


  NEURAL PATHWAYS WITHIN THE SPINAL CORD
• major parts of the brain

  cerebrum

  cerebellum

  brainstem
• embryonic brain/ THREE LITTLE BRAIN


  PROSENCEPHALON

  MESENCEPHALON

  RHOMBECEPHALON
• what is the strongest muscle in the body?

  masseter
• division of white matter


  anterior column

  lateral column

  posterior column
• division of gray matter


  anterior horn cell

  lateral horn cell

  posterior horn cell
• electrical signals in neuron


  graded potential

  action potential
• gray matter


  consists of neuron cell bodies , dendrites, unmyelinated axons. it is involved in processing and integrating information in the brain and spinal cord
• white matter


  consists of myelinated fibers that connect brain regions for communication
• action potential


  a sequence of rapidly occurring events that decreases and reverse the membrane potential and then eventually restore it to the resting state
• graded potential


  arise mainly at the dendrites

  short distance

  varies depending on amplitude

  ligand-graded ion
• ion channel


  leak channels

  ligand gated channel

  voltage gated channels

  mechanically gated channels
• phase

  depolarizing phase

  repolarizing phase

  hyper polarizing phase

  refractory period
• meninges


  covering of the brain
• three layers of meninges


  dura mater

  arachnoid mater

  pia mater
• subarachnoid


  potential space between arachnoid mater and pia mater
• cranial nerves whose primary function is olfaction


  olfactory nerve