Slides

HISTOLOGY OF SENSORY SYSTEMS
GENERAL SENSORY RECEPTORS
unencapsulated receptors
encapsulated receptors
GENERAL SENSORY RECEPTORS
unencapsulated receptors: free nerve endings
mechanoreceptors
thermoreceptors
nociceptors
mixed-mode receptors
encapsulated receptors: tissue-associated nerve endings
Pacinian corpuscles
Meissner's corpuscles
Merkel cells
proprioceptors
RECEPTORS IN ORAL MUCOSA AND TISSUES
functions:
-pain: warnings
-speech production
-food manipulation
-bite force, modulate mastication
structures similar to general cutaneous
and proprioceptors
Unencapsulated receptors: free nerve endings
in skin, joints, viscera, oral cavity
Modality (type of stimulus):
-mechanoreceptors: stretch, displacement, pressure
-thermoreceptors: hot (> body temp), cold (< body temp)
-chemoreceptors: acids, bases, salts, organics
-nociceptors: strong stimuli, could damage tissue
(may be any modality)
-mixed-mode receptors
epidermis
free nerve ending
papillary layer
of dermis
Wheater, "Functional Histology" 7-26
SCHEMATIC OF ORAL
MUCOSA
nerve trunk
TenCate 12-4
FREE NERVE ENDINGS IN ORAL EPITHELIUM
Moss 6-12B
Schwann cell sheath
FREE NERVE
ENDINGS IN
PERIODONTAL
LIGAMENT
TenCate 9-31
FREE NERVE ENDINGS
IN PERIODONTAL
LIGAMENT
TenCate 9-32A
Encapsulated receptors: tissue-associated nerve endings
-Pacinian (lamellated) corpuscles
in deep dermis, hypodermis, viscera, joint capsules:
pressure
-Meissner's (tactile) corpuscles
in dermal papillae near epidermis: light touch, vibration
-Merkel cells (tactile disks)
in epidermis basal layer: fine touch
-proprioceptors
in joints, tendons, muscles: stretch, tension, joint angle
THICK SKIN slide 216
epidermis
dermis
Pacinian corpuscle
in hypodermis
MEISSNER'S CORPUSCLES IN TIPS OF DERMAL PAPILLAE
slide 216
M
M
MEISSNER’S CORPUSCLE IN ORAL MUCOSA
(lamina propria)
MAJOR MASTICATORY
MUSCLES
-proprioceptors give
feedback for bite
control
Scheid 14-27