Touch Smell Taste
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system that provides information about the body senses, including touch, movement, pain, and temperature.
Somatosensory System:
sensory system that provides information about the position and movement of the head.
Vestibular System:
Movement receptors
• otolith organ • semicircular canal • saccule • linear acceleration • otolith
structure in the inner ear vestibular system that provides information about the angle of the head relative to the ground and about linear acceleration.
Otolith Organ:
one of three looping chambers found in inner ear that provide information regarding the rotation of the head.
Semicircular Canal
one of structures of otolith organs.
Saccule
: one of the structures of the otolith organs.
Utricle
: force perceived when our rate of movement changes.
Linear Acceleration
: stone made of calcium carbonate that is attached to the hair cells in the otolith organs
Otolith
Central pathways
• Ventral posterior (VP) Nucleus • primary somatosensory cortex • Glabrous Skin • epidermis • dermis • subcutaneous Tissue
nucleus of the thalamus that receives information regarding pain, touch, and the position and movement of the head. .
Ventral Posterior (VP) Nucleus:
cortex located in the postcentral gyrus of the parietal lobe that is responsible for the initial cortical processing of somatosensory input.
Primary Somatosensory Cortex:
: hairless skin.
Glabrous Skin
: outermost layer of the skin.
Epidermis
: layer of skin lying below the outermost epidermis.
Dermis
layer of tissue lying below the dermis
Subcutaneous Tissue:
Touch Receptors
• mechanoreceptors • encapsulated receptor • Meissner’s corpuscle • Pacinian corpuscle • Merkel’s disk • Ruffini’s ending
: skin receptor that senses touch, pressure, or vibration.
Mechanoreceptor
mechanoreceptor in which the axon fibers are surrounded by a fluid-filled capsule formed of connective tissue
Encapsulated Receptor:
: encapsulated, fast- adapting mechanoreceptor with small receptive field that responds primarily to pressure.
Meissner’s Corpuscle
encapsulated, rapidly adapting mechanoreceptor with large receptive field that provides information about pressure and vibration.
Pacinian Corpuscle:
nonencapsulated, slow- adapting mechanoreceptor with small receptive field that provides information primarily about pressure.
Merkel’s Disk:
non encapsulated, slow- adapting mechanoreceptor with large receptive field that provides information regarding stretch.
Ruffini’s Ending:
myelinated fiber that carries information about cold and sharp pain to the central nervous system.
Aδ (alpha-delta) Fiber