Somatic Senses General Sensory System. Sensation Define Stimulus Type Sensory Organ Sensory Receptors Exteroceptors Interoceptors Proprioceptors Receptor.

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Presentation transcript:

Somatic Senses General Sensory System

Sensation Define Stimulus Type Sensory Organ Sensory Receptors Exteroceptors Interoceptors Proprioceptors Receptor Potential Transduction Pathway Response Adaptation

Somatosensory Receptors Nocireceptors Thermoreceptors Mechanoreceptors Tactile Baroreceptors Proprioceptors Chemoreceptors

Somatosensory Exteroceptors

Somatic Sensory Modalities Discriminative Touch Pressure, Vibration, Texture Rapidly Adapting Meissners Corpuscles Pacinian Corpuscles Slowly Adapting Merkel Disks Pain and Temperature Free nerve endings Fast Pain : A Fibers Slow Pain: C Fibers Ruffini corpuscle: heat Krause corpuscle: cold Proprioception Muscle Spindle Golgi Tendon Organ

Pseudounipolar Neuron

Ascending Sensory Tracts

Crossing Over

General Somatosensory Pathway

Ascending Sensory Spinal Cord Tract Information Touch and Pressure Discriminative Dorsal Columns: Fasciculus Group Crude Anterior Spinal Thalamic Pain and Temperature Lateral Spinal Thalamic Proprioception Length : Posterior Spinocerebellar Force: Anterior Spinocerebellar

Sensory Cortex

Sensory Homunculus

Association Areas

Touch and Pressure

Meissners Corpuscles

Pacinian Corpuscles

Merkel Disks

Posterior [Dorsal] Columns

Sensory Receptors: Pain

Sensory Receptors: Temperature

Proprioception

Histology of Proprioceptors Muscle Spindle Fibers Golgi Tendon Organ

Experiments Discrimination tests Location Density Threshold Adaptation

Testing Fields for Pressure

Depth and Threshold

Receptor Potentials

Receptor Testing Variations

Temperature

Somatosensory Responds to: Contact with foreign objects Warning Feedback Development Changes in temperature Warning Heat regulation Avoid Damage

Dermatomes Skin region monitored Sensory receptors Spinal Nerve pair maps the body CN V supplies face

Cranial Nerves with Somatosensory CN V Ophthalmic Br. Maxillary Br. Mandibular Br. CN X ANS parasympathetic for pain

Reflex Response

Pain and Temperature Reflex

Reflex Testing

Motor Response from Higher Centers

Descending Motor Tracts Corticospinal Lateral Anterior Corticobulbar Vestibulospinal Tectospinal Recticulospinal Rubrospinal

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