Download SPE 717 - Chapter 10 Somatosensory System | PHYS - Neuroanatomy & Physiology and more Quizzes Physiology in PDF only on Docsity!
What is somatosensation?
bodily experienced external and internal sensations includes sensations of 1) pain, 2) temperature, 3) touch, and 4) proprioception TERM 2
Where do the receptors of somatosensation
begin and how do they transmit info?
DEFINITION 2 Receptors begin in the 1) skin, 2) muscles, 3) joints, and 4) blood vessels that convert sensation to neural signals and transmit them to the spinal cord and into the sensory cortex in the parietal lobe. TERM 3
What is proprioception?
DEFINITION 3 Internal awareness of position, posture, and movement *important for speech and language because we need to be aware of our speech articulators and for writing because we need to be aware of limb movement. TERM 4
What is stereognosis?
DEFINITION 4 the analysis and identification of objects through touch/tactile manipulation TERM 5
Graphesthesia
DEFINITION 5 the recognition of figures and numbers written on the body
What is fine discriminative touch? What types
of discrimination does it include?
Awareness of touch discrimination between two or more multiple points of touch stereognosis graphesthesia TERM 7
What are some types of somatic sensation?
DEFINITION 7 Mechanoreception Thermoreception Nociception TERM 8
Mechanoreception
DEFINITION 8 touch pressure vibration (tactile) kinesthesia and proprioception Divided into fine discriminative touch (localizable) and diffuse (unlocalizable) TERM 9
Kinesthesia
DEFINITION 9 Internal awareness of the range and direction of limb movements TERM 10
Thermoreception
DEFINITION 10 Sensations of cold and heat
What types of sensations are detected by free
nerve endings?
sensations of pain and temperature TERM 17
Where are free nerve endings most
commonly distributed?
DEFINITION 17 Body Skin Cutaneous Tissue Visceral Organs TERM 18
Free Nerve
Endings
DEFINITION 18 Respond by sending signals at a slow rate for a long periode.g. think of feeling of heat after having touched the stove. TERM 19
Where are expanded tip endings most
commonly distributed?
DEFINITION 19 The dermis and joints TERM 20
What sensations are mediated by expanded
tip endings?
DEFINITION 20 touch temperature pressure
Expanded Tip
Endings
Transmit slowly and are moderately adaptive TERM 22
Division of Somatosensory System
DEFINITION 22 Dorsal column medial leminiscal system Anterolateral system TERM 23
The Dorsal Column Medial Leminiscal System
(DCMLS) is also known as
DEFINITION 23 Epicritic System TERM 24
What sensations does the DCMLS mediate?
DEFINITION 24 postural position - both conscious and unconscious fine discriminative touch vibration kinesthesia proprioception TERM 25
What are the neural pathways of the DCMLS?
DEFINITION 25 Two Fasciculi fasciulus gracilis fasiculus cuneatus These two follow the same neural pathways.
What are clinical correlates of damage to the
DCMLS?
sensory loss cognitive deficits tactile agnosia astereognosis TERM 32
Astereognosis
DEFINITION 32 interchangeable with tactile agnosia the most extreme form: patient ignores existence of one side of the body and/or corresponding visual fields TERM 33
What is the anterolateral system also known
as?
DEFINITION 33 Protopathic system TERM 34
What is the anterolateral system divided into?
DEFINITION 34 lateral spinothalamic tract anterior spinothalamic tract TERM 35
Lateral spinothalamic tract
DEFINITION 35 carries sensation of pain and temperature begins with receptors of the skin
Results of damage to the lateral
spinothalamic tract
alteration in the perception of pain and temperature phantom limb TERM 37
What are types of altered responses to pain?
DEFINITION 37 Analgesia Hypalgesia Hyperalgesia TERM 38
Analgesia
DEFINITION 38 No sensation of pain TERM 39
Hypalgesia
DEFINITION 39 Decreased sensation of pain or higher pain treshold TERM 40
Hyperalgesia
DEFINITION 40 increased pain sensation
What is known as the trigeminal system?
Maxillary branch opthalamic branch mandibular branch TERM 47
What is the principal sensory nerve for the
face and head?
DEFINITION 47 Trigeminal nerve - cranial nerve V TERM 48
What areas does the trigeminal
system/cranial nerve V mediate sensations
from?
DEFINITION 48 mediate sensations from skin of the face, forehead, anterior half of scalp, most of your orbital cavities TERM 49
What are clinical correlates of the Trigeminal
system?
DEFINITION 49 Trigeminal neuralgia TERM 50
Trigeminal neuralgia
DEFINITION 50 excruciating pain in the ipsilateral half of the face- could be a sign of MS
What is the backup for conscious
proprioception?
Tracts of unconscious proprioception*clinical correlates of these tracts are hard to determine TERM 52
What tracts manage unconscious
proprioception and from where?
DEFINITION 52 ventral spinocerebellar tract dorsal spinoverebellar tract cuneocerebellar from muscles and joints TERM 53
Where is conscious proprioception mediated?
DEFINITION 53 DCMLS
