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Cranial Nerve 3

Aka: Cranial Nerve 3, Cranial Nerve III, Oculomotor Nerve, CN 3
  1. Physiology
    1. Innervates five extrinsic eye muscles
      1. Levator palpebrae superioris
      2. Medial rectus
      3. Superior rectus
      4. Inferior rectus
      5. Inferior oblique
  2. Course
    1. Nucleus sits in floor of cerebral aqueduct
      1. Subdivided into focus for each eye muscle
    2. Nerve courses between
      1. Superior Cerebellar Artery and
      2. Posterior Cerebral Artery
    3. Forward and lateral to Posterior Clinoid process
    4. Cavernous Sinus lateral wall
    5. Enters orbit via superior orbital fissure
  3. Exam
    1. Unilateral Pupil Paralysis:
      1. Increased Intracranial Pressure
      2. Subarachnoid Hemorrhage
    2. Oculomotor Nerve palsy with pupil sparing
      1. Seen as complication with Diabetes Mellitus

Oculomotor nerve structure (C0028864)

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 (UWDA) Cranial nerve which connects the midbrain to the extra-ocular and intra-ocular muscles.
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
English cranial nerve III, Cranial Nerve IIIs, Oculomotor Nerve, Oculomotor nerve structure, Oculomotor nerve tree, Oculomotor Nerves, Third Cranial Nerve, Third Cranial Nerves
Spanish estructura del nervio oculomotor, III par craneal, nervio craneal III, nervio motor ocular, nervio oculomotor, tercer par craneal, tercer par craneano
Parent Concepts Visual system structure (C0587900), Cranial Nerves (C0010268), Oculomotor system structure (C1298729), Peripheral Nervous System (C0206417)
Sources AOD , CSP, MSH, MTH, NCI, SCTSPA, SNOMEDCT, UWDA
Derived from the NIH UMLS (Unified Medical Language System)


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