CN V & VII

Question 1

CN V motor to:

Answer 1

Somatic motor

• musles of mastication
• mylohyoid, anterior digastric, tensor tympani, tensor veli palatini

Visceral motor (parasympathetic postganglionic fibres)

• intrinsic muscles of eye
• lacrimal gland
• salivary glands

Question 2

Trigeminal nerve in situ

Answer 2

• trigeminal ganglion lies in trigeminal cave b/w periosteum and meningeal dura
• ganglion is somatic sensory only

Question 3

Sensory innervation of the face

Answer 3

V1

• supratrochlear
• supratrochlear
• infratrochlear

V2

• infraorbital
• zygomaticotemporal
• zygomaticofacial

V3

• auricotemporal
• buccal
• mental

Question 4

Branches of Ophthalmic nerve

Answer 4

• Nasociliary
  
  • anterior & posterior ethmoidal: sensation from anterior part of nasal cavity & paranasal sinuses (except maxillary)
  • infratrochlear: nasal skin sensation
  • external nasal: nasal skin sensation
  • Long ciliary (symp+S): sensation from cornea, sympathetics to dilator pupillae muscle
  • Short ciliary (para+S): sensation from eye, parasympathetics to constrictor pupillae & ciliary muscles
• Frontal
  
  • supraorbital
  • supratrochlear
  • both serve sensation from anterior scalp, forehead, upper eyelid & its conjunctive
• Lacrimal
  
  • senseation from upper lids & its conjunctive, parasympathetics to lacrimal gland