ocular nerve innervation

Question 1

cranial nerves that are related to the eye

Answer 1

optic nerve (II)
oculomotor (III)
trochlear (IV)
trigeminal (V)
abducent (VI)
facial (VII)

Question 2

what does the oculomotor innervate?

Answer 2

- is a motor nerve
superior division innervates 
- levator palpebrae superioris muscle
- superior rectus muscle 
inferior division innervate
- inferior rectus, inferior oblique, medial rectus
- the efferent parasympathetic fibres supplies 
> ciliary muscles (accommodation)
> sphincter pupillae muscle 

(All extraocular muscles (EOM) except superior oblique and lateral rectus)

Question 3

what does the trochlear nerve innervate?

Answer 3

• is a motor nerve
• innervate superior oblique(SO) only
• thinnest nerve & longest among orbital nerve

Question 4

what does the abducent nerve innervate?

Answer 4

• is a motor nerve
• innervates lateral rectus muscle
• originated from midbrain through the carvenous sinus to the superior orbital fissure to the common tendinous ring

Question 5

what does facial nerve innervate?

Answer 5

• is a motor nerve
• innervates areas of face and scalp
• do not innervate ocular muscles

Question 6

what does optic nerve innervate?

Answer 6

• is a sensory nerve

- sends afferent visual information from retina to brain

Question 7

trigeminal nerve

Answer 7

• is a sensory nerve
• the largest of all cranial nerve w the motor and sensory roots, and a ganglion associated
• three division of the nerve are:
  > ophthalmic
  > maxillary
  > mandibular

Question 8

autonomic nervous system

Answer 8

• Involve with innervation of involuntary structures
• The 2 components are:
  > Sympathetic nervous system
  > Parasympathetic nervous system
• Innervates smooth muscles:
  > Iris muscles
  > Ciliary muscles
  > Smooth muscles of the eyelids
  > Choroidal and conjunctival blood vessels
  > Lacrimal gland

Question 9

sympathetic nervous system

Answer 9

• In the eye, main functions of these nerves are:
  > Vaso-constriction
  > Pupil dilation (contraction of dilatator pupillae/dilator muscle)
  > Lid retraction (contraction of the smooth muscle cells of the tarsal/ Muller muscle)
  > Basal secretion of the lacrimal gland
• fight/flight

Question 10

Parasympathetic Nervous System

Answer 10

• In the eye, the function of this system is to innervate:
  > Ciliary muscle (accommodation)
  > Iris sphincter muscle (miosis)
  > Lacrimal gland
• This system helps to restore & conserve energy