Extraocular Movement

Aka: Extraocular Movement, Oculomotor Nerve Structure, Conjugate Gaze, Pontine Paramedian Reticular Formation, Lateral Gaze Center, Paraabducens Nucleus, Medial Longitudinal Fasciculus

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II. Definitions

  1. Conjugate Gaze
    1. Movement of both eyes in the same direction at the same time

III. Anatomy: Innervation

  1. Cerebral Cortex
    1. Voluntary Conjugate Gaze (Brodmann's Area 8)
    2. Involuntary Conjugate Gaze (Areas 17-19)
  2. Cranial Nerves
    1. CN 3 (nucleus in Midbrain)
    2. CN 4 (nucleus in Midbrain)
    3. CN 6 (nucleus in pons)
  3. Nucleii and Pathways
    1. Lateral Gaze Center (Pontine Paramedian Reticular Formation, Paraabducens Nucleus)
      1. Responsible for horizontal gaze and saccade eye movements
      2. Facilitates Conjugate Gaze by synapsing with contralateral fibers for coordinated eye movements
    2. Medial Longitudinal Fasciculus (MLF)
      1. Transmits signals between CN 3 and CN 6 to coordinate eye movements (Conjugate Gaze)
      2. Dysfunctional in Internuclear Ophthalmoplegia (e.g. Multiple Sclerosis, esp. if bilateral)
      3. Example of normal Conjugate Gaze pathway via Medial Longitudinal Fasciculus
        1. Cortical signal from voluntary gaze center directs left eye to look left
        2. Left eye CN 6 (lateral rectus) fires for the left eye to look left
        3. CN 6 signals Synapse with the Lateral Gaze Center
        4. Signals are transmitted via Medial Longitudinal Fasciculus across midline to contralateral CN 3
        5. Medial rectus directs the right eye to also look left (adduct to look medially)

IV. Anatomy: Extraocular Muscles: Innervated by CN 3 with 2 exceptions

  1. Medial Range of Motion
    1. Medial Rectus (Cranial Nerve III)
  2. Lateral Range of Motion
    1. Lateral Rectus (Cranial Nerve VI)
  3. Upward Range of Motion
    1. Superior Rectus (Cranial Nerve III)
    2. Inferior Oblique (Cranial Nerve III)
  4. Downward Range of Motion
    1. Inferior Rectus (Cranial Nerve III)
    2. Superior Oblique (Cranial Nerve IV)

V. Anatomy: Images

  1. See Neurologic Anatomy of the Eye
  2. eye_eom.png
  3. eyeOculomotorGrayBB785.gif Lewis (1918) Gray's Anatomy 20th ed (in public domain at Yahoo or BartleBy)
  4. eyeOculomotorGrayBB889.gif Lewis (1918) Gray's Anatomy 20th ed (in public domain at Yahoo or BartleBy)

VI. Pathophysiology

  1. See Eye Deviation

VII. References

  1. Goldberg (2014) Clinical Neuroanatomy, Medmaster, p. 40-53
  2. Netter (1997) Atlas Human Anatomy, ICON Learning, p. 114, 126

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Related Studies (from Trip Database) Open in New Window

Ontology: Oculomotor nerve structure (C0028864)

Definition (FMA) Cranial nerve which connects the midbrain to the extra-ocular and intra-ocular muscles.
Definition (UWDA) Cranial nerve which connects the midbrain to the extra-ocular and intra-ocular muscles.
Definition (NCI_CDISC) The third cranial nerve.
Definition (MSH) The 3d cranial nerve. The oculomotor nerve sends motor fibers to the levator muscles of the eyelid and to the superior rectus, inferior rectus, and inferior oblique muscles of the eye. It also sends parasympathetic efferents (via the ciliary ganglion) to the muscles controlling pupillary constriction and accommodation. The motor fibers originate in the oculomotor nuclei of the midbrain.
Definition (CSP) third cranial nerve; sends motor fibers to the levator muscles of the eyelid and to the superior rectus, inferior rectus, and inferior oblique muscles of the eye; sends parasympathetic efferents (via the ciliary ganglion) to the muscles controlling pupillary constriction and accommodation; motor fibers originate in the oculomotor nuclei of the midbrain.
Concepts Body Part, Organ, or Organ Component (T023)
MSH D009802
SnomedCT 56193007
English Nerve, Oculomotor, Nerves, Oculomotor, Oculomotor Nerve, Oculomotor Nerves, Cranial Nerve III, Cranial Nerve, Third, Cranial Nerves, Third, Nerve, Third Cranial, Nerves, Third Cranial, Third Cranial Nerve, Third Cranial Nerves, cranial nerve III, Oculomotor nerve [III], Nervus oculomotorius [III], Oculomotor nerve tree, cranial nerve iii, oculomotor nerves, cranial iii nerve, Cranial Nerve IIIs, third cranial nerve, 3n, oculomotor nerve, Nervus oculomotorius, OCULOMOTOR NERVE, Nervus Oculomotorius, Nerve IIIs, Oculomotorius, Nervus, Nerve III, Third cranial nerve, Oculomotor nerve, Cranial nerve III, Oculomotor nerve structure (body structure), Oculomotor nerve structure, Oculomotor nerve, NOS
French Troisième paire crânienne, Nerf oculomoteur, Nerf crânien III, Nerf moteur oculaire commun, Troisième nerf crânien, Nerf oculo-moteur, Nerf crânien 3
Swedish Ögonrörelsenerv
Czech nervus oculomotorius, okohybný nerv, III. hlavový nerv
Finnish Silmän liikehermo
Russian GLAZODVIGATEL'NYI NERV, TRETII CHEREPNOI NERV, ГЛАЗОДВИГАТЕЛЬНЫЙ НЕРВ, ТРЕТИЙ ЧЕРЕПНОЙ НЕРВ
German DRITTER HIRNNERV, Hirnnerv III, III. Hirnnerv, Nervus oculomotorius
Italian Nervo cranico III, Terzo nervo cranico, Nervo oculomotore
Croatian OKULOMOTORNI ŽIVAC
Latvian Acs kustību nervs
Polish Nerw okoruchowy, Nerw III
Japanese 動眼神経, 眼球運動神経, 第3脳神経
Norwegian 3. hjernenerve, Nervus oculomotorius, Øyets bevegelsesnerve, Okulomotorisk nerve, Hjernenerve 3
Spanish III Par Craneal, Nervio Craneal III, III par craneal, estructura del nervio oculomotor (estructura corporal), estructura del nervio oculomotor, nervio craneal III, nervio motor ocular, nervio oculomotor, tercer par craneal, tercer par craneano, III Nervio Craneal, Nervio Oculomotor, Tercer Nervio Craneal
Portuguese III Par Craniano, III Nervo Craniano, Nervo Craniano III, Nervo Oculomotor, Terceiro Nervo Craniano
Dutch IIIe hersenzenuw, Nervus cranialis III, Nervus oculomotorius
Derived from the NIH UMLS (Unified Medical Language System)

Ontology: Medial longitudinal fasciculus (C0152373)

Concepts Body Part, Organ, or Organ Component (T023)
SnomedCT 28390009
English medial longitudinal fasciculus, medial longitudinal bundle, medial longitudinal fascicle, Fasciculus longitudinalis dorsalis (Riley), Fasciculus longitudinalis posterior (posticus), Tractus longitudinalis medialis, Fasciculus longitudinalis medialis, Fasciculus commissurae posterioris, Medial longitudinal fasciculus structure (body structure), Medial longitudinal fasciculus structure, Medial longitudinal fasciculus, NOS, Medial longitudinal fasciculus, MLF-Medial longitudinal fasciculus
Spanish estructura del fascículo longitudinal medio (estructura corporal), estructura del fascículo longitudinal medio, fascículo longitudinal medio
Derived from the NIH UMLS (Unified Medical Language System)

Ontology: Conjugate gaze (C0522329)

Concepts Organ or Tissue Function (T042)
SnomedCT 103255006
English Conjugate gaze, Conjugate gaze (finding)
Spanish mirada conjugada (hallazgo), mirada conjugada
Derived from the NIH UMLS (Unified Medical Language System)

Ontology: Paramedian nucleus of pons (C2332972)

Concepts Body Part, Organ, or Organ Component (T023)
English Paramedian nucleus of pons, Nucleus paramedianus pontis
Derived from the NIH UMLS (Unified Medical Language System)

Related Topics in Anatomy

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