W1: Distribution of Trigeminal Nerve

Question 1

where in the cranial cavity is the trigeminal nerve located

Answer 1

In meckles cave near the apex of the petrous portion of the temporal bone.

Question 2

Describe generally the innervation type and the pathway of V1.

(Prabh no branches yet its in the flash cards.)

Answer 2

General somatic Afferent

Passes along the lateral wall of cavernous sinus, exiting the skull @ Superior orbital Sinus.

Question 3

What are the 3 major branches of V1 and describe their pathways in the orbit

(Everyone take one)

Answer 3

Lacrimal nerve: travels superior to the lateral rectus

Frontal Nerve Travels anteriorly between the periostium (bone) of the orbit and Palbrae levator Superioris

• Branches into the supra orbital and supratrochlear nerve

Nasociliary nerve Enters the orbit lateral to the optic nerve and gives rise to the colliery nerves and infra trochlear nerve

Question 4

Describe generally the innervation type and the pathway of V2.

(Prabh no branches yet its in the flash cards.)

Answer 4

General Somatic Afferent

Travels along the lateral wall of cavernous sinus and exits the skull at foramen rotundum then travels along pterygopalatine fossa

Question 5

What are the main branches of V2 and where in the skull or space do they branch. And describe their general pathway including minor branches.

(everyone take 1 branch)

Answer 5

Zygomatic nerve
- Passes through the inferior orbital space to enter the orbit and branches into two branches.
- Helps to provide parasympathetics from the pteryogopalantine ganglion to the lacrimal gland.

Infraorbital nerve
- known as the continuation of the maxillary nerve.
- Infraorbital fissure, orbit, infraorbital groove, infraorbital canal, infraorbital foramen.
- 2 branches occur in the canal, the middle and anterior superior alveolar nerves

Posterior superior alveolar nerve
- Enters the alveolar canals where it passes along the maxillary tuberosity.
- innervates the maxillary molars **except MB root of 16,26

greater and lesser palatine Nerves
- Associated with the ptergopalatine ganglion
- Greater passes through greater palatine foramen, (innervates the hard palate)
-lesser passes through the lesser palatine foramen (innervates the soft palate)

Question 6

what are the 3 nerves that innervate the palate and how do they distribute.

Answer 6

nasopalatine nerve (Incisive Foramen)
- supplies small portion behind the Anterior teeth

Lesser Palatine nerve (““foramen)
- supplies the hard palate

Greater palatine nerve (““forman)
- soft palate

Question 7

Describe generally the innervation type and the pathway of V3.

(Prabh no branches yet its in the flash cards.)

Answer 7

General Somatic Efferent
General Somatic Afferent

Passes through foramen ovale

Question 8

What are the main branches of V3 and where in the skull or space do they branch. And describe their general pathway including minor branches.

(everyone take 1 branch)

Answer 8

Auriculotemporal Nerve
- 1st branch after foramen ovale
- passes superiorly to supply sensation to the TMJ and skin of the ear.
- Middle menial artery splits its branches
- Runs inferior to the lateral pterygoid along the medial side of the mandible deep to the partotid and pierces the parotid gland before passing over the zygomatic arch.

Lingual Nerve
- Passes between the medial pterygoid and ramus of the mandible
- supplies the anterior 2/3 of tongue with sensory innervation and gingiva on lingual side of mandibular teeth

Inferior alveolar Nerver
- Largest branch of V3
- Runs between the spenomandibular ligament and the ramus of the mandible then entering the mandibular foramen.
- Splits into two nerves the incisive and the mental nerve.
- Incisive innervates all anterior mandibular teeth
- Nerve to mylohyiod branches just prior to the Mandibular foramen.

Buccal Nerve
-Passes between the 2 heads of the lateral pterygoid through the infra temporal fossa.
- provides sensory to the buccinator and skin of the cheeks and buccal mucosa.