2. NUCLEUS
1. Nucleus Motorius Nervi Trigemini
2. Nucleus Mesencephalicus (Tractus
mesencephalicus N. Trigemini)
3. Nucleus Pontinus (Nucleus Principalis
Nervi Trigemini ) – For touch, temp, pain
4. Nucleus Spinalis N. Trigemini – For touch,
temp, pain
3. A Mixed Cranial Nerve (SM)
1. Motor Nucleus
Nucleus Motorius N. Trigemini
2. Sensory Nucleus
Nucleus Mesencephalicus
Nucleus Principalis N. Trigemini
Nucleus Spinalis N. Trigemini
Sensory nucleus of N. Trigemini form the
Ganglion Trigeminale in cavum trigeminale
4. Location of Nuclei
1. Brain: on dorsal part of pons, between
pons and pedunculus cerebellaris media
2. Subarachnoid space: Sinus
pontocerebellaris
3. Dura mater: In sinus cavernosus, in
cavum trigeminale
4. In spinal cord (nucleus spinalis nervi
trigemini)
5. Location of Nuclei
Nuclei of trigeminal nerve: in brainstem and upper part of spinal cord.
Mesencephalic nucleus of trigeminal nerve: in lateral region of
periaqueductal grey matter in the midbrain. Contains the first neurons
responsible for proprioception of:
the jaw and
intraocular muscles,
temporomandibular joints,
teeth and
upper and lower jaw.
Principal nucleus of trigeminal nerve: in dorsolateral pontine tegmentum.
Main task is the tactile sensation.
Spinal nucleus of trigeminal nerve: a long sensory nucleus stretching from
the pons down into the upper 3 segments of spinal cord's dorsal horn.
Primarily concern is the pain and temperature sensation.
8. Trigeminal Nuclei
1 motor radix and 1 sensory radix leave the
brain at transition of pons into medial cerebellar
peduncles
The motor root adjoins trigeminal ganglion from
beneath and takes part in the 3rd branch (N.
Mandibularis) of nervus trigeminus.
The motor root formed by processes of nervus
motorius nervi trigemini
In dorsal part of pons
Innervates somatic muscles of head & brain
11. Sensory Nuclei
1. Axons lie in the trunk of cerebrum, passing to the
opposite side and proceed to nerve cells of
thalamus which later relay to the lateral side of
cortex
2. Peripheral processes of neuron lies within trigeminal
nerve & end as receptors in skin & mucous
membrane of head
3. Sensory roots form the pseudounipolar cells of the
trigeminal ganglion
4. Ganglion trigeminale lies in the impressio
trigeminale, on the anterior surface of temporal bone
pyramid
12. Ganglion Trigeminale
1. Lies in Impressio Trigemini
2. At sinus of dura mater, covered by dura
mater in cavum trigeminale
14. Trigeminal Nuclei Innervation
1. Skin of the face
2. Mucosal tunic and sinuses of nose
3. Oral cavity
4. Anterior 2/3rd of the tongue
5. Teeth
6. Masseteric Muscle
7. Muscle of floor of the oral cavity
Mylohyoid muscle
Anterior belly of digastricus muslce
8. Tensor tympani
9. Soft palate