Exam 2 - Lecture 19 (Sensory Receptors) Flashcards
What are sensory receptors?
Receptors that detect changes in thermal, mechanical, or chemical stimuli applied to the surface or interior of the body.
Where are 3 places where we can find somatic sensory receptors?
- Skin
- Muscles
- Tendon
Where in the CNS are sensory receptors located?
Dorsal horn/dorsal root ganglion
What is the classification of dorsal root ganglion neurons?
Unipolar
How does the CNS know the specific stimulus?
Sensory receptors
Sensory modalities are _____ to certain sensory receptors.
specific
On what part of the neuron are somatic sensory receptors found?
Terminal end of the primary sensory neurons
DRG neurons are _____ neurons
primary sensory
What are the 7 types of somatic sensory receptors?
- Free nerve ending
- Hair follicle terminal
- Merkel’s corpuscle
- Meissner’s corpuscle
- Pacinian corpuscle
- Golgi-tendon organ
- Muscle spindle
What is the modality for FNE?
pain, temperature
What is the modality for hair follicle terminals?
touch
What is the modality for Merkel’s corpuscle?
touch, pressure
What is the modality for Meissner’s corpuscle?
touch, vibration (<100 Hz)
What is the modality of Pacinian corpuscle?
Vibration (>100 Hz)
What is the modality of Golgi-tendon organ?
Muscle tension, proproception
What is the modality of muscle spindle?
Proprioception
What is the morphology of FNE?
free nerve ending (“naked”)
What is the morphology of hair follicle terminal?
free nerve ending (“naked”)
What is the morphology of Merkel’s corpuscle?
Merkel cell + axon terminal
What is the morphology of Meissner’s corpuscle?
Encapsulated by cells
What is the morphology of Pacinian corpuscle?
LARGE, encapsulated by many layers of cells
What is the morphology of muscle spindle?
Intrafusal muscle fibers, sensory fibers, c.t. capsules
What is the morphology of Golgi-tendon organ?
Collagen fibers, sensory axons, c.t. capsule
Where are FNEs located?
epidermis
