Neurophysiology Flashcards
(22 cards)
Where does the initial innervation of the tooth originate?
Sensory Trigeminal Ganglia
Development of dental innervation is tightly related to ____ and ____
The advancing tooth morphogenesis
Dental cell differentiation
During which stages of tooth development do the nerve fibers establish a nerve plexus beneath the apical foramina
Cap and Bell
Nerve fibers innervate the ____, the ____, and ____
Subodontoblastic layer
Coronal odontoblast layer
Predentin layer
What is the most common form of pain in the orofacial region
Odontologia
Which nerves evoke pain sensations?
Interdental nerves
What percentage of US adults do not seek routine dental care for fear of pain?
50%
Pulpal nerve fibers contain ____
Neuropeptides
- Calcitonin Gene-Related Peptide (CGRP)
- Substance P (SP)
- Neuropeptide Y
- Neurokinin A
- Vasoactive Intestinal polypeptide (VIP)
What causes neuropeptide release?
Tissue injury
Complement activation
Antigen-antibody reactions
Stimulation of the inferior alveolar nerve
Vasoactive peptides, Mechanical stimulation, and electrical stimulation produce vaso____
Vasodilation
Substance P and CGRP ____ and ____ and ____
Cause vasodilation
Contribute to hyperalgesia
Promote wound healing
How does the pulp react when insult causes activation of intradental nociceptors
Neurogenic vasodilation
Which nerve fibers function in motor and proprioception?
A-alpha
Which nerve fibers function in pressure and touch?
A-beta
Which nerve fibers function in motor to muscle spindles?
A-gamma
Which nerve fibers function in pain, temperature, touch?
A-delta
Which nerve fibers function in preganglionic autonomics?
B
Which nerve fibers function in pain only
C dorsal root
Which types of nerves innervate the pulp?
A-delta
C
A-delta fibers of the pulp are responsible for:
Having their nerve endings at the pulp-dentin border
Dentinal pain/sensitivity
Sharp, well localized pain
C fibers of the pulp are responsible for:
Heat sensitivity
Dull, poorly localized pain
Pain associated with tissue damage
What can alter the function of A-delta fibers?
Changes in microcirculation
- Decreased blood flow due to activation of sympathetic vasoconstrictor fibers depresses the dentinal responsiveness
