Posted on by dp

4. Oculomotor nerve

  1. Is the third cranial nerve. (T/F?)
  2. Has two nuclei: oculomotor nucleus and the Edinger-Westphal nucleus. (T/F)
  3. Runs in the lateral wall of the cavernous sinus. (T/F?)
  4. Enters orbit through the inferior orbital fissure. (T/F?)
  5. Its upper division supplies the superior rectus and the superior oblique muscles. (T/F?)
  6. Its inferior branch innervates medial rectus, inferior rectus and inferior oblique muscles. (T/F?)

  1. T
  2. T
  3. T
  4. F
  5. F
  6. T

  1. The Edinger–Westphal nucleus or accessory oculomotor nucleus is the parasympathetic pre-ganglionic nucleus that innervates the iris sphincter muscle and the ciliary muscle.
  2. Picture:

    Henry Vandyke Carter [Public domain], via Wikimedia Commons
  3. It enters the orbit via the superior orbital fissure.
    Henry Vandyke Carter [Public domain], via Wikimedia Commons
  4. The upper division supplies the superior rectus muscle and levator palpebrae superioris (elevating muscle of upper eyelid). The superior oblique muscle is innervated by the trochlear nerve (the fourth cranial nerve).