Sensory receptors
What are the four types of encapsulated receptors?
Four major types of encapsulated mechanoreceptors are specialized to provide information to the central nervous system about touch, pressure, vibration, and cutaneous tension:
Meissner’s corpuscles, Pacinian corpuscles, Merkel’s disks, and Ruffini’s corpuscles
(Figure 9.3 and Table 9.1).
Are hair follicle receptors encapsulated?
The discriminative touch receptors are
encapsulated 1° afferent
terminals (Meissner, Pacinian and Ruffini corpuscles), hair follicle endings and Merkel complexes in skin. The proprioceptive receptors in muscle are also encapsulated and include the muscle spindle and Golgi tendon organ.
What are the receptor classifications?
| Sensory receptors with corresponding stimuli to which they respond. | Receptor Stimulus | Photoreceptors Visible light | Proprioceptors Sense of position | Thermoreceptors Temperature |
|---|
What are non encapsulated receptors?
Mechanoreceptors can be encapsulated or nonencapsulated. The nonencapsulated endings include: Peritricial nerve
endings around hair
follicles that detect touch through movement of hair. Merkel’s discs on non-hair bearing skin such as the hands that perceive touch.
Which are examples of encapsulated receptors?
- Meissner’s corpuscles – light touch.
- Pacinian corpuscles – deep pressure, vibration.
- Muscle spindle receptors – muscle stretch.
What are touch receptors called?
Mechanoreceptors
: These receptors perceive sensations such as pressure, vibrations, and texture. There are four known types of mechanoreceptors whose only function is to perceive indentions and vibrations of the skin: Merkel’s disks, Meissner’s corpuscles, Ruffini’s corpuscles, and Pacinian corpuscles.
Do hair follicles have nerves?
At the base of the hair follicle are
sensory nerve fibers
that wrap around each hair bulb. Bending the hair stimulates the nerve endings allowing a person to feel that the hair has been moved. One of the main functions of hair is to act as a sensitive touch receptor.
What skin receptors are activated while holding hands?
These receptors include
Meissner’s corpuscles, Pacinian corpuscles, Merkel’s disks
, and Ruffini corpuscles.
What type of receptors detect deep pressure and vibration?
Deep pressure and vibration is transduced by
lamellated (Pacinian) corpuscles
, which are receptors with encapsulated endings found deep in the dermis, or subcutaneous tissue. Light touch is transduced by the encapsulated endings known as tactile (Meissner’s) corpuscles.
What are receptors give examples?
A receptor is an organ or cell able to respond to heat, light or other external stimulus and transmit a signal to a sensory nerve. Example:
Photoreceptor (a receptor which detects light)
and phonoreceptor (a receptor which detects sound).
What are Chemoreceptors?
Chemoreceptors. A chemoreceptor, also known as chemosensor, is
a sensory receptor that transduces a chemical signal into an action potential
. The action potential is sent along nerve pathways to parts of the brain, which are the integrating centers for this type of feedback.
What is receptor and its types?
Receptors come in many types, but they can be divided into two categories:
intracellular receptors
, which are found inside of the cell (in the cytoplasm or nucleus), and cell surface receptors, which are found in the plasma membrane.
What does non encapsulated mean?
: not encapsulated
nonecapsulated bacteria
.
What is an encapsulated nerve?
Encapsulated nerve endings are
specialized structures
, consisting of non-neural components which enhance their physiological properties. The non-neural component is a cluster of connective tissue surrounding the axon.
What stimulates free nerve endings?
Free nerve endings are
sensitive to painful stimuli
, to hot and cold, and to light touch. They are slow to adjust to a stimulus and so are less sensitive to abrupt changes in stimulation. Figure 2. Four of the primary mechanoreceptors in human skin are shown.
