Ascending Sensory Pathways 2 Flashcards
What are the three divisions of the trigeminal nerve?
Ophthalmic - V1
Maxillary - V2
Mandibular - V3
Which cranial nerve exits via the foramen rotundum
Maxillary branch of trigeminal
Which cranial nerve exits via the superior orbital fissure?
Ophthalmic branch of trigeminal
Which cranial nerve exits via the foramen oval?
Mandibular branch of trigeminal
Where does Herpes Simplex reside in a latent state?
The trigeminal ganglion
Where are the cranial nerve nuclei located?
The brainstem
Which cranial nerves carry general sensation of the head?
V - Trigeminal
VII - Facial
IX - Glossopharyngeal
X - Vagus
What does the information from CN V/VII/IX and X travel in?
Trigeminal Sensory Pathway via the trigeminal nucleus to the thalamus
Where do the motor nuclei of trigeminal nerves lie?
Medial to sensory nuclei
What are the three segments of the trigeminal nuclei?
Mesencephalic nucleus
Pontine/Chief Sensory nucleus
Spinal nucleus
Which parts of the spinal nucleus receives pain and temperature input?
Caudal region
Which parts of the spinal nucleus receives simple touch and pressure
Rostral region
Where are the primary neutron cell bodies located in the trigeminal pathway?
The trigeminal ganglion
What is the key feature of fibres carrying pain, temp, touch and pressure, in the trigeminal pathway?
They descend before they synapse with secondary neurons
What are the features of the fibres carrying pain, temp, touch and pressure in the trigeminal pathway?
Thin and slow conducting
The descending fibres of the trigeminal pathway in what region of the brainstem?
Descend in the spinal react of the trigeminal nucleus
Superficial on the outer edge of the medulla
Where do primary fibres carrying pain, temp, touch and pressure synapse?
primary to secondary: in the spinal nucleus
Secondary to tertiary: in the thalamus
Where does the trigeminothalamic tract ascend?
Adjacent to cerebroaqueduct
Which pathway, touch and pressure or pain and temperature, descend furthest before synapsing?
Pain and Temperature Pathway
Where do the fibres of the touch and pressure pathway synapse to second neurons?
The more rostral region of the spinal nucleus
Which nucleus do fibres carrying discriminative touch information travel to?
The pontine / chief sensory nucleus
Which nucleus do fibres carrying proprioception information travel to?
Mesencephalic nucleus
What is special about the mesencephalic nucleus?
This pathway is an exception to the generalisation that first order cell bodies are in the peripheral ganglia.
What are the characteristics of discriminatory touch fibres?
Fat
Fast conduction
