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Cranial Nerve 4Aka: Cranial Nerve IV, Trochlear Nerve, CN 4

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  1. Physiology
    1. Innervates extraocular muscle: superior oblique muscle
    2. Superior oblique muscle passes via pulley (trochlea)
  2. Course
    1. Trochlear nucleus at floor of cerebral aqueduct
    2. Tracks around superior cerebellar, cerebral peduncles
    3. Enters tentorium cerebelli at posterior clinoid process
    4. Proceeds through lateral wall of Cavernous Sinus
    5. Enters orbit via superior orbital fissure
  3. Exam
    1. Normal:
      1. Eye movement inferior laterally
    2. Paralysis:
      1. Head Tilt toward the contralateral shoulder
      2. Affected eye slightly elevated in primary position
      3. Can only depress affected eye slightly

Trochlear nerve structure (C0041159)

Definition (MSH)The 4th cranial nerve. The trochlear nerve carries the motor innervation of the superior oblique muscles of the eye.
ConceptsBody Part, Organ, or Organ Component (T023)
MSHD014321
Englishcranial nerve IV, Fourth Cranial Nerve, Fourth Cranial Nerves, pathetic nerve, Superior oblique nerve, Trochlear Nerve, Trochlear nerve structure, Trochlear nerve tree, Trochlear Nerves
Spanishcuarto nervio craneal, cuarto par craneal, cuarto par craneano, estructura del nervio patetico, IV par craneal, nervio craneal IV, nervio oblicuo superior, nervio patetico, nervio troclear
Parent ConceptsCranial Nerves (C0010268), Oculomotor system structure (C1298729), Peripheral Nervous System (C0206417)
SourcesAOD, MSH, MTH, NCI, SCTSPA, SNOMEDCT, UWDA
Derived from the NIH UMLS (Unified Medical Language System)



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