Anatomy - CN V - Trigeminal Flashcards
What are the 3 branches of CN V?
- Ophthalmic
- Maxillary
- Mandibular
What are the 3 branches of V1?
- Frontal
- Lacrimal
- Nasociliary
What are the 2 branches of the Frontal n.?
- Supratrochlear
2. Supraorbital
What are the branches of the Nasociliary n.?
- Short ciliary nerves
- Long
- Post. Ethmoid n.
- Ant. Ethmoid n.
- Infratrochlear n.
The nasociliary n. enters the orbit more ___ (than the frontal and lacrimal nerves) within the ___ of the supraocular muscles
Inferiorly
Tendinous Ring
The frontal and lacrimal nerves enter the orbit through the __
Superior tip of the superior orbital fissure
Where does the supratrochlear n. exit the orbit?
What does it supply?
Near the medial corner
Sensory to: scalp of forehead frontal sinus conjunctiva upper eyelid
Where does the supraorbital n. exit the orbit?
What does it supply?
Through the supraorbital foramen
Sensory to:
scalp of the head and forehead
upper eyelid
Where does the lacrimal n. exit the orbit?
What does it supply?
Lateral corner
Lacrimal gland
Sensory to:
Conjunctiva
Upper eyelid
The lacrimal n. is connected to the ___ nerve of V2
Zygomaticotemporal
Which is the most inferior of the V1 branches?
Nasociliary n.
Short ciliary nerves carry ___
Sensory info from the eye through ciliary ganglion and, via communicating branches, into the nasociliary
Long ciliary nerves carry ___
Sensory info from the eye
BUT bypass the ciliary ganglion
Posterior ethmoid n. carries ___
Sensory info to:
Sphenoid sinus
Posterior ethmoid air cells
Anterior ethmoid n. carries ___
Sensory info to:
Middle and anterior ethmoid air cells
Anterior portion of nasal septum
Lateral portion of nose
Infratrochlear n. carries ___
Sensory info to: Soft tissue at the corner of the orbit Conjunctiva Upper eyelid Bridge of nose
Within the ____ fossa, the maxillary n. gives rise to branches, communicates with ___ and then divides into ___ and ___ nerves.
Pterygopalatine
Pterygopalatine Ganglion
Zygomatic and Infraorbital
These nerves arise within the pterygopalatine fossa and connect V2 to the pterygopalatine ganglion:
Ganglionic branches
This nerve branches off distal to the pterygopalatine ganglion, courses inferiorly over the tuberosity of the maxilla to enter the Alveolar Canal.
What is it and what does it supply?
Posterior Superior Alveolar n.
Sensory to:
Upper premolars and molars
Branches of the Zygomatic n.
Which is a branch off of ___
- Communicating branch
- Zygomaticofacial n.
3 zygomaticotemporal n.
V2
Branches of the infraorbital n.
Which is a branch of __
- Anterior Superior Alveolar n.
- Inferior Palpebral n.
- Lateral Nasal n.
- Superior Labial n.
V2
This nerve provides sensory info to upper incisors and canines
Anterior Superior Alveolar n.
This nerve courses superiorly from the infraorbital foramen and provides sensory info to the lower eyelid and conjunctiva
Inferior palpebral n.
This nerve provides sensory info to the nasal septum and the floor of the nasal cavity
Lateral nasal n.
This nerve provides sensory info to:
- the skin between the nose and upper lip
- the upper lip
- a portion of the oral mucosa
Superior labial n.
Rank the 3 branches of CN V in order from largest to smallest
Mandibular (3)
Maxillary (2)
Ophthalmic (1)
The mandibular n. is divided into 2 divisions:
Anterior
Posterior
The ___ division of V3 is the motor root of the trigeminal, with the exception of ___
Anterior
Buccal
Nerves in the anterior division of V3:
- N. to Medial Pterygoid
- N. to Lateral Pterygoid
- Masseteric n.
- Deep Temporal n.
- Buccal n.
This branch of V3 supports the Otic ganglion, but has no synaptic connections there
Nerve to Medial Pterygoid
The N. to Medial Pterygoid gives of muscular branches to ___ and ___
Tensor Tympani
Tensor Veli Palatini
What does the Masseteric n. innervate?
Masseter
What innervates the temporalis muscle?
Deep Temporal n.
The buccal n. provides ___ to ___
Sensory info to cheek
The posterior division of V3 is the origin of what 3 nerves?
- Auriculotemporal n.
- Lingual n.
- Inferior Alveolar n.
The auriculotemporal n. provides __
Sensory info: Temporal region TMJ Auditory canal Outer surface of the tympanum
Autonomics:
Parotid gland
At the ___ the lingual n. bifurcates to form the ___
Hyoglossus
N. to sublingual gland
Sublingual n.
The Lingual n. is connected to the ___ by communicating branches
Submandibular Ganglion
The sublingual n. gives sensory info to __
Anterior 2/3rds of the tongue
N. to mylohyoid is a branch off of ___
It innervates___
Inferior Alveolar n.
Mylohyoid
Anterior belly of Digastric
Within the mandibular canal, the inferior Alveolar n. sends sensory branches to the ___ then bifurcates anteriorly into the __
Lower molars and premolars
Incisive n. and Mental n.
This nerve gives sensory info to the lower incisors, canine, and the first premolar and gingiva
Incisive n.
This nerve gives sensory info to the chin and lower lip
Mental n.
