Lecture 3- trigeminal Travers Flashcards
the trigeminal nerve has 3 divisions:
ophthalmic which is… only
maxillary which is … only
mandibular which is…
sensory
sensory
sensory and motor
infraorbital is a branch of which of the 3 divisions of the trigeminal nerve?
maxillary
what type of receptors does the infraorbital nerve NOT have? RA1 SA1 RA2 SA2
RA2 (no pacinian corpuscles!)
lingual is a branch of the
mandibular branch of trigeminal
what kind of ending predominate the tongue?
unencapsulated coiled endings- krause end bulbs
what are Krause end bulbs and what are they similar to?
unencapsulated nerve endings in the tongue and they are similar to meissner corpuscle (RA1)
does the tongue have rapid or slow adapting mechanoreceptors?
BOTH despite having only one kind of ending
The tmj is primarily innervated by…. which is a branch of the… of the trigeminal nerve
auriculotemporal
mandibular
the tmj is innervated by…. , …. and…
auriculotemporal
masseter
posterior deep temporal
the tmj has mostly …. fibers
C
The PDL is innervated by… and…
superior alveolar of the maxillary
inferior alveolar of the mandibular
2 types of receptors in the PDL
simple and complex ruffini
innervation from the trigeminal ganglia to the PDL are mostly located at the …. of the tooth while innervation from the mesencephalic nucleus to the PDL are mostly located at the…. of the tooth
middle
apex
which nerve fibers are temperature sensitive
A delta and Cfibers
at what temperature does warm sensation turn to painful
43 degrees celsius
what part of the brainstem is associated with temperature
interpolaris of spinal trigeminal nucleus (in medulla)
gasserian ganglia and semilunar are other names for
trigeminal ganglion
Which is biggest and fastest?
A beta
A delta
C fiber
A beta
Which has the highest threshold?
A beta
A delta
C fiber
C- fiber
then A delta followed by A beta
RAII and SAII are what size and have what kind of borders?
large, obscure borders
RAI and SAI are what size and have what kind of borders?
small, sharp borders
Meissner corpuscles are examples of what class of mechanoreceptors?
RAI
Meissner corpuscles are superficial or deep?
their function is….
are they encapsulated?
superficial
spatial discrimination
yes
Pacinian corpuscles are an example of what class of mechanoreceptors?
RAII
Pacinian corpuscles are superficial or deep?
their function is…
are they encapsulated?
deep
vibration
yes
Merkel discs are an example of what class of mechanoreceptors?
SAI
Merkel discs are superficial or deep?
their function is….
are they encapsulated?
superficial
pressure
no
Ruffini endings are an example of what class of mechanoreceptors?
SAII
Ruffini endings are superficial or deep?
their function is….
are they encapsulated?
deep
skin stretch
no
3 mechanisms of mechanotransduction
- ENaC (epithelial Na channels)
- TRP channels (transient receptor potentials)
- Piezo1 and Piezo2: 36 transmembrane domains
Semmes-weinstein monofilaments are also called… and they measure…. and are calibrated in…
von frey hairs
touch discrimination
mg
the…. and… nerve can sometimes be damaged by 3rd molar extraction
lingual and mental nerve (branch of IAN)
is microneurography possible in the TMJ?
no
temperature transduction is mediated by…
transient receptor potentials
