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Cranial Nerve 2Aka: Cranial Nerve II, Optic Nerve, CN 2

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  1. Physiology
    1. Vision mediated via retinal innervation
  2. Course
    1. Retinal fibers coalesce into the optic nerve
    2. Optic Nerves become Optic Tracts at the optic chiasm
      1. Left Optic Tract (Comprises Right Visual field)
        1. Left Lateral and Right Medial Optic Nerves
      2. Right Optic Tract (Comprises Left Visual field)
        1. Right Lateral and Left Medial Optic Nerves
  3. Exam
    1. Visual Acuity
    2. Funduscopic Exam
    3. Visual Field Testing
      1. Screening: Confrontation
      2. Assessment: Perimetry

Optic Nerve (C0029130)

Definition (MSH)The 2nd cranial nerve. The optic nerve conveys visual information from the retina to the brain. The nerve carries the axons of the retinal ganglion cells which sort at the optic chiasm and continue via the optic tracts to the brain. The largest projection is to the lateral geniculate nuclei; other important targets include the superior colliculi and the suprachiasmatic nuclei. Though known as the second cranial nerve, it is considered part of the central nervous system.
Definition (CSP)second cranial nerve; conveys visual information from the retina to the brain; carries the axons of the retinal ganglion cells which sort at the optic chiasm and continue via the optic tracts to the brain; the largest projection is to the lateral geniculate nuclei; other important targets include the superior colliculi and the suprachiasmatic nuclei; though known as the second cranial nerve, it is considered part of the central nervous system.
Definition (NCI)The nerve that carries messages from the retina to the brain.
ConceptsBody Part, Organ, or Organ Component (T023)
MSHD009900
EnglishCranial nerve II, Cranial Nerve IIs, ON - Optic nerve, Optic Nerve, Optic nerve structure, Optic Nerves, Second Cranial Nerve, Second Cranial Nerves
Spanishestructura del nervio optico, II par craneal, nervio craneal II, nervio optico, segundo par craneal, segundo par craneano
Parent ConceptsVisual Pathways (C0042829), Cranial Nerves (C0010268), Visual pathway structure (C0459803), Trunk of cranial nerve (C0501420)
SourcesAOD, CSP, LCH, MSH, MTH, NCI, SCTSPA, SNOMEDCT, UWDA
Derived from the NIH UMLS (Unified Medical Language System)



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