Flashcards in Ascending Sensory Pathways 2 Deck (78)
How many branches of the trigeminal (V) nerve are there?
What is branch V1 of the trigeminal nerve called?
What is branch V2 of the trigeminal nerve called?
What is branch V3 of the trigeminal nerve called?
Where does the opthalmic branch (V1) of the trigeminal nerve exit the skull?
Superior occipital fissure.
Where does the maxillary branch (V2) of the trigeminal nerve exit the skull?
Where does the mandibular branch (V3) of the trigeminal nerve exit the skull?
Which branch of the trigeminal nerve supplies the upper teeth, and through what nerve?
Maxillary (V2) branch.
-superior alveolar nerve
Which branch of the trigeminal nerve supplies the lower teeth, and through what nerve?
Mandibular (V3) branch.
-inferior alveolar nerve
Which regions of the face does the opthalmic branch (V1) of the trigeminal nerve supply?
Which regions of the face does the maxillary branch (V2) of the trigeminal nerve supply?
Upper lip and teeth
(+ PS to lacrimal and nasal glands)
Which regions of the face does the mandibular branch (V3) of the trigeminal nerve supply?
Lower lip and teeth
Anterior 2/3 of tongue
(+ motor to muscle of mastication, and PS to parotid + submandibular glands)
What does the herpes zoster virus do after someone has recovered from chicken pox?
Resides in sensory roots of specific spinal nerves (e.g. trigeminal). Reactivation >> shingles.
How are the blisters distributed in shingles?
Over the dermatome of the affected spinal nerve(s).
What are the 2 group of somaesthetic modalities?
-Modalities that are essential to survive
-Modalities that increase detail
What are modalities that are essential to survive?
Pain, temperature, some touch, pressure.
What are modalities that increase detail?
-Discriminative touch (2-point, vibration)
What carries information from receptor to the sensory cortex in the body and face?
A 3 neuron chain (1*, 2*, 3*).
Where do 1* neurons carry information, and where are there cells bodies located?
From PNS to the CNS.
-cell bodies in peripheral ganglia
Where do 2* neurons carry information?
Axons cross the midline and extend to the thalamus.
Where do 3* neurons carry information?
From the thalamus to the post-central gyrus.
Where are cranial nerve nuclei located?
Within the brainstem.
Where sensory cranial nerve nuclei receive information from?
Fibres entering the brainstem in cranial nerves.
What do motor cranial nerve nuclei give rise to?
Motor fibres that leave the brainstem in cranial nerves.
What is the equivalent of the sensory cranial nerve nuclei in the body?
Dorsal grey horn.
-receives 1* sensory neurons, and contains cell bodies and synapses
What is the equivalent of the motor cranial nerve nuclei in the body?
Ventral grey horn.
-contains motor fibres
Which cranial nerves is general sensation from the head carried in? (4)
Which pathway does information from cranial nerves V, VII, IX, X travel in
(general sensation from head)?
TRIGEMINAL SENSORY PATHWAY.
-trigeminal nucleus >> thalamus >> post-central gyrus
Which cranial nerve is the major carrier of sensory information from the face, nose, scalp and dura?
Trigeminal nerve (V).