Cranial Nerves (Updated)

• Name CN I

  Olfactory Nerve
• Component of CN I

  Sensory
• Function of CN I

  Smell
• Opening of CN I

  Opening in cribriform plate of ethmoid bone
• Name of CN II

  Optic Nerve
• Component of CN II

  Sensory
• Function of CN II

  Visual
• Opening of CN II

  Optic canal
• Name of CN III

  Oculomotor Nerve
• Component of CN III

  Motor
• Function of CN III

  Lifts upper eyelid; turns eyeball upward, downward, and medially; constricts pupil; accommodates eye
• Opening of CN III

  Superior Orbital Fissure
• Parts included in CN III

  • Levator palpebrae superioris
  • Superior rectus
  • Inferior rectus
  • Inferior Oblique
  • Medial rectus
• Name of CN IV

  Trochlear Nerve
• Component of CN IV

  Motor
• Function of CN IV

  Assists in turning eyeball downward and laterally
• Opening of CN IV

  Superior orbital fissure
• Name of CN V

  Trigeminal Nerve
• Component of CN V

  Sensory and motor
• Divisions of CN V

  1. Opthalmic
  2. Maxillary
  3. Mandibular
• Component of CN V1

  Sensory
• Component of CN V2

  Sensory
• Component of V3

  Motor and Sensory
• Function of CN V1

  Cornea, skin of forehead, scalp, eyelids, and nose; also mucous membrane of paranasal sinuses and nasal cavity
• Function of CN V2

  Skin of face over the maxilla and the upper lip, teeth of the upper jaw, mucous membrane of the nose, maxillary air sinus, and palate
• Function of CN V3

  • Motor: Muscles of mastication, mylohyoid, anterior belly of digastric, tensor veli palatini, and tensor tympani
  • Sensory: Skin of cheek, skin over mandible, lower lip, and side of head; teeth of lower jaw and temporomandibular joint; mucous membrane of mouth and anterior two thirds of the tongue
• Opening of CN V1

  superior orbital fissure
• Opening of CN V2

  foramen rotundum
• Opening of CN V3

  foramen ovale
• Name of CN VI

  Abducens Nerve
• Component of Abducens


  Motor
• Function of CN VI

  Lateral rectus muscle: turns eyeball laterally
• Opening of CN VI

  Superior orbital fissure
• Name of CN VII

  Facial Nerve
• Component of CN VII

  Motor and Sensory; Secretomotor Parasympathetic
• Function of CN VII

  • Motor: Muscles of the face, cheek, and scalp; stapedius. muscle of the middle ear; stylohyoid; and posterior belly of digastric
  • Sensory: Taste from anterior two thirds of Uie tongue, floor o f mouth, and palate
  • Secretomotor parasympathetic: Submandibular and sublingual salivary glands, lacrimal gland, and glands of the nose and palate
• Opening of CN VII

  • Motor: Internal Acoustic Meatus, Facial Canal, Stylomastoid Foramen
  • Secretomotor parasympathetic: Petrotympanic fissure; hiatus of facial canal, foramen lacerum, pterygoid canal
• Name of CN VIII

  Vestibulocochlear Nerve
• Divisions of CN VIII

  1. Vestibular fibers
  2. Cochlear fibers
• Component of CN VIII


  Sensory