Flashcards in Trigeminal Nerve 1 Deck (44)
what are the divisions of the trigeminal nerve?
- Ophthalmic Nerve (V1)
- Maxillary Nerve (V2)
- Mandibular Nerve (V3)
what is the exit point in the skull of the ophthalmic nerve?
superior orbital fissure
what is the exit point in the skull of the maxillary nerve?
what is the exit point in the skull of the mandibular division?
how many bones is the hard palate composed of?
what bones make up the hard palate?
- palatine process of maxilla
- horizontal plate of palatine bone
name the foramen found on the hard palate:
- Incisive foramen (anterior)
- Greater palatine foramen
- Lesser palatine foramen
what part of the mandible forms part of the TMJ?
the condylar process
what type of nerves control the muscles of mastication? where are these located?
- special visceral efferent nerves
- from the motor nucleus in the pons
what are the three types of general somatic afferent nerves called(sensory) ? where are these found?
- Mesencephalic (midbrain)
- Chief sensory (pons)
- Spinal nucleus (medulla oblongata)
what does the sensory mesencephalic nucleus control?
what does the chief sensory nucleus control?
what does the (sensory) spinal nucleus control?
- pain & temperature for structures supplied by CNV
- general consciousness sensation for the viscera controlled by CN IX & X
what is the function of the trigeminal nerve?
- the three divisions of the trigeminal nerve supply general somatic sensation to most of the face, head, and associated orbital, nasal and oral cavities
- the mandibular division also contains the motor root for the muscles of mastication
where is the trigeminal ganglion located?
Meckel’s cave on the apex of the petrous temporal bone
what is Meckel’s cave?
a cave of dura mater
what is meant if all three CNV divisions are affected?
the lesion must be in the pons or at the cranial base
If the CNV divisions are affected as well as other nerves too such as CN III & CN IV, what does this suggest in terms of the affected site?
the CNV affected site is likely to be in the cavernous sinus
what course does the ophthalmic division of CNV take?
- passes anteriorly in the lateral wall of the cavernous sinus
- reaches the superior orbital fissure
what are the main branches of the Ophthalmic Division?
what does the frontal nerve (from the ophthalmic division) divide into? where does this correspond to on the face?
- supraorbital nerve
- supratrochlear nerve
supplies sensation to the skin of vertex and upper eyelid/forehead
what does the lacrimal nerve (of the ophthalmic division) innervate?
provides sensory innervation to:
- lacrimal gland
- skin of lateral upper eyelid and forehead
what does the nasociliary nerve (of the ophthalmic division) divide into?
- long ciliary nerves
- anterior & posterior ethmoidal nerves
- infratrochlear nerve
where does the external nasal nerve derive from?
its a continuation of the anterior ethmoidal nerve
where does the external nasal nerve innervate?
provides sensory innervation to the skin at the tip of the nose
where does the infratrochlear nerve innervate?
provides sensory innervation to the skin at the medial angle of the aye and adjacent root of the nose
what nerve supplies sensation to the cornea of the eye?
what is shingles at the tip of the nose suggestive of?
warning sign that singles will also develop on the cornea
what is the course of the maxillary division of CNV?
CN V2 passes anteriorly in the lateral wall of the cavernous sinus & reaches
- the pterygopalatine fossa via the foramen rotundum