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Which type of somatic senses are stimulated by mechanical displacement of body tissue?
Which type of somatic senses detect heat and cold?
Which type of somatic sensations relate to the physical state of the body, including position sensations and muscle sensations?
Which type of somatic senses is activated by factors that damage the tissues?
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Which type of tactile receptor is known for its great sensitivity to touch?
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Which type of tactile receptor detects continuous states of deformation, such as heavy prolonged touch and pressure?
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Which sensory pathway carries signals for fine touch sensations, position sensations from joints, and vibratory sensations?
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What type of nerve fibers transmit signals via A-beta nerve fibers with a velocity of 30 to 70 m/sec?
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Where do the anterolateral sensory pathway's anterior and lateral divisions carry sensations from?
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Which area of the somatosensory cortex receives diffuse, nonspecific input signals that facilitate specific regions of the cortex?
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What is the function of Merkel's discs in hairy skin?
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Which type of receptors have expanded tips that detect touch sensation and initial contact with the body?
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What type of sensory signals does the anterolateral system carry?
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Through which nerve fibers do free nerve endings transmit signals?
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Where does the anterolateral system terminate?
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What is the range of velocities for transmission in the slow-chronic pain pathway?
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Which type of headache may result from abnormal vascular phenomena?
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What causes referred pain to the surface of the head from deep head structures?
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What are the three types of sensory receptors for discriminating thermal gradations?
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What is the degree of spatial localization of signals in the slow-chronic pain pathway?
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Which type of headache results from muscle spasm?
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What causes intense intracranial headache when fluid is removed from the spinal canal?
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What are the two major types of pain described?
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Which sensory pathway carries signals for pain, thermal sensations, crude touch and pressure sensations, tickle and itch sensations, and sexual sensations?
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Which type of nerve fibers transmit signals via A-beta nerve fibers with a velocity of 30 to 70 m/sec?
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What is the function of Merkel's discs in hairy skin?
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Which type of headache may result from abnormal vascular phenomena?
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What are the three types of sensory receptors for discriminating thermal gradations?
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Which type of sensory signals does the anterolateral system carry?
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Through which nerve fibers do free nerve endings transmit signals?
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Where does the anterolateral system terminate?
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What causes referred pain to the surface of the head from deep head structures?
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What is the degree of spatial localization of signals in the slow-chronic pain pathway?
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Which type of somatic senses are stimulated by mechanical displacement of body tissue?
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What is the function of Merkel's discs in hairy skin?
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What type of headache may result from abnormal vascular phenomena?
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What causes referred pain to the surface of the head from deep head structures?
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What causes intense intracranial headache when fluid is removed from the spinal canal?
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What type of somatic senses relate to the physical state of the body, including position sensations and muscle sensations?
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What are the three physiologic types of somatic senses?
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What are Meisner's corpuscles known for?
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Which type of tactile receptor detects continuous states of deformation, such as heavy prolonged touch and pressure?
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What is the degree of spatial localization of signals in the slow-chronic pain pathway?
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What are the velocities of transmission in the slow-chronic pain pathway?
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Which type of headache results from pain stimuli arising inside the cranium?
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What causes referred pain to the surface of the head from deep head structures?
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What is the range of velocities for transmission in the fast sharp pain pathway?
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Which type of sensory receptors excite pain receptors by mechanical, thermal, and chemical stimuli?
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Which type of headache causes excessive contraction of the eye ciliary muscles due to difficulty in focusing one's eyes clearly?
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What is the degree of spatial localization of signals in the fast sharp pain pathway?
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What type of pain is elicited mostly by chemical types of pain stimuli or persisting mechanical or thermal stimuli?
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"Thermal gradations are discriminated by at least three types of sensory receptors. Which one of these is NOT a thermal receptor?
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Study Notes
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The non-hairy parts of the skin, including fingertips and lips, have receptors that detect tactile sensations under the categories of touch, pressure, and vibration.
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Meissner's corpuscles are tactile receptors with expanded tips that detect touch sensation and initial contact with the body, while Merkel's discs in hairy skin detect slight movement of hairs and initial contact.
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Ruffini's endings are multibranched, encapsulated nerve endings that detect continuous states of deformation, such as heavy prolonged touch and pressure.
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Pacinian corpuscles are located beneath the skin and deep in the fascial tissues and detect vibration sensations.
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Almost all specialized sensory receptors transmit signals via A-beta nerve fibers, which have a velocity of 30 to 70 m/sec. Free nerve endings transmit signals via Delta-A myelinated fibers, which have a velocity of 5-30 m/sec.
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The dorsal column–medial lemniscal system and the anterolateral system are two sensory pathways that transmit somatic signals to the central nervous system. The dorsal column–medial lemniscal system carries signals for fine touch sensations, position sensations from joints, and vibratory sensations, while the anterolateral system carries signals for pain, thermal sensations, crude touch and pressure sensations, tickle and itch sensations, and sexual sensations.
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The dorsal column–medial lemniscal system enters the spinal cord through the dorsal roots and continues to the thalamus, while the anterolateral system enters the spinal cord from the dorsal roots, synapses in the dorsal horns, and terminates at all levels of the lower brain stem and in the thalamus.
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The somatosensory cortex has 50 distinct areas, called Brodmann's areas, based on histological structural differences. It consists of six layers of neurons, each with a different function, including receiving incoming sensory signals and sending signals to related parts of the brain or deeper parts of the nervous system.
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Layers I and II of the somatosensory cortex receive diffuse, nonspecific input signals that facilitate specific regions of the cortex.
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The dorsal column–medial lemniscal system projects through the thalamus to the somatosensory cortex, which interprets and processes the sensory information. The anterolateral pathway transmits less critical sensory signals, including pain, heat, cold, and crude touch and pressure sensations.
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The anterolateral sensory pathway has anterior and lateral divisions. The anterior division carries pain and temperature sensations from the body, while the lateral division carries tactile information from the limbs.
-
The non-hairy parts of the skin, including fingertips and lips, have receptors that detect tactile sensations under the categories of touch, pressure, and vibration.
-
Meissner's corpuscles are tactile receptors with expanded tips that detect touch sensation and initial contact with the body, while Merkel's discs in hairy skin detect slight movement of hairs and initial contact.
-
Ruffini's endings are multibranched, encapsulated nerve endings that detect continuous states of deformation, such as heavy prolonged touch and pressure.
-
Pacinian corpuscles are located beneath the skin and deep in the fascial tissues and detect vibration sensations.
-
Almost all specialized sensory receptors transmit signals via A-beta nerve fibers, which have a velocity of 30 to 70 m/sec. Free nerve endings transmit signals via Delta-A myelinated fibers, which have a velocity of 5-30 m/sec.
-
The dorsal column–medial lemniscal system and the anterolateral system are two sensory pathways that transmit somatic signals to the central nervous system. The dorsal column–medial lemniscal system carries signals for fine touch sensations, position sensations from joints, and vibratory sensations, while the anterolateral system carries signals for pain, thermal sensations, crude touch and pressure sensations, tickle and itch sensations, and sexual sensations.
-
The dorsal column–medial lemniscal system enters the spinal cord through the dorsal roots and continues to the thalamus, while the anterolateral system enters the spinal cord from the dorsal roots, synapses in the dorsal horns, and terminates at all levels of the lower brain stem and in the thalamus.
-
The somatosensory cortex has 50 distinct areas, called Brodmann's areas, based on histological structural differences. It consists of six layers of neurons, each with a different function, including receiving incoming sensory signals and sending signals to related parts of the brain or deeper parts of the nervous system.
-
Layers I and II of the somatosensory cortex receive diffuse, nonspecific input signals that facilitate specific regions of the cortex.
-
The dorsal column–medial lemniscal system projects through the thalamus to the somatosensory cortex, which interprets and processes the sensory information. The anterolateral pathway transmits less critical sensory signals, including pain, heat, cold, and crude touch and pressure sensations.
-
The anterolateral sensory pathway has anterior and lateral divisions. The anterior division carries pain and temperature sensations from the body, while the lateral division carries tactile information from the limbs.
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Description
Test your knowledge of somatic senses, including touch, pressure, temperature, and pain. Learn about the 3 physiologic types of somatic senses and the nervous mechanisms involved in collecting sensory information from the body.
