Questions and Answers
What are Corpuscles of touch (Meissner corpuscles)?
Tactile receptors that are sensitive to touch.
What sensations do corpuscles of touch (tactile corpuscles) provide?
Where are Lamellated (Pacinian) corpuscles commonly found?
In deeper subcutaneous tissues, tendons, and ligaments.
What do Lamellated (lamellar) corpuscles detect?
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What is the major function of Golgi tendon organs?
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What do muscle spindles help with?
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What is the purpose of a root hair plexus?
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Where are Merkel cells found?
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What type of sensations do tactile discs (TYPE 1) respond to?
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What do Ruffini corpuscles respond to?
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Where are bulbous corpuscles (type 2) located?
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Study Notes
Sensory Receptors Overview
- Corpuscles of Touch (Meissner Corpuscles): Sensitive tactile receptors responsible for detecting light touch.
- Tactile Corpuscles: Provide sensations of touch, pressure, and vibration.
- Lamellated (Pacinian) Corpuscles: Located in deeper tissues; detect heavy pressure and vibrations.
Mechanoreceptors Specifics
- Lamellated (Lamellar) Corpuscles: Mechanoreceptors in glabrous skin; sensitive to sudden changes in pressure and vibrations. Also found in the pancreas, indicating their role in detecting vibrations and low-frequency sounds.
- Golgi Tendon Organs: Located at the junction of muscle fibers and tendons; sense muscle tension during contraction and send signals about exerted force to the brain.
- Muscle Spindles: Inform the brain of muscle contractions and play a crucial role in proprioception, helping determine the position and movement of body parts.
Skin Mechanoreceptors
- Root Hair Plexus: A network of nerve endings around hair follicles; it is highly sensitive and detects movements of hair.
- Merkel Cells (Type 2): Found in the basal epidermis; responsible for detecting mechanical pressure, position, and deep static touch characteristics such as shapes and edges.
Touch Sensitivity
- Tactile Discs (Type 1): Nerve endings sensitive to light touch; most effective at detecting vibrations between 10 to 50 hertz. Primarily located in thick hairless skin, particularly on finger pads.
- Ruffini Corpuscles: Located in deeper skin layers, they respond to sustained pressure with little adaptation. Also register joint mechanical deformation and angle changes up to 2.75 degrees.
- Bulbous Corpuscles (Type 2): Slowly adapting mechanoreceptors found in cutaneous tissue between dermal papillae and hypodermis, responding to deep tissue pressure.
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Description
Test your knowledge with these A&P 232 flashcards focused on different types of tactile receptors. Each card provides definitions for key terms related to touch, pressure, and vibration. Understand the roles of Meissner and Pacinian corpuscles in sensory perception.
