SOMATIC SENSORY SYSTEM

1
SOMATIC SENSORY SYSTEM

• AQSA SJUHADA
• Department of Oral Biology
• Faculty of Dentistry Airlangga University

2
REFLEX
Receptor
Stimulation
Afferent system
Central Nervous System
Efferent system
Effector
Muscle
3
Senses indera/sensasi-sensoris
Somatik
Otonomik
Khusus /special
visus,olfactorius,auditorius,vestibular, taste
4

• SENSORY RECEPTOR
• - The part of a neuron or specialized cells that
  generates action potential in neuron.
• Often associated with nonneural cells that
  surround it, forming a sense organ
• Including mechanical (touch, pressure), thermal
  (degree of warmth), electromagnetic (light),
  chemical energy (odor, taste, concentration of O2
  and CO2)
• Require adequate stimulus to generate action
  potential

5

• SENSORY MODALITY
• Vision
• Hearing
• Smell
• Taste
• Rotational acceleration
• Linear acceleration
• Touch-pressure
• Warmth
• Cold

• Pain
• Joint position and movement
• Muscle length
• Muscle tension
• Arterial blood pressure
• Central venous pressure
• Inflation of lung
• Blood temperature in brain
• Arterial PO2
• pH of CSF
• Osmotic pressure of plasma
• Arteiovenous blood glucose difference

6

• Classification of sensory receptors
• Teleceptors (distance receivers)
• Exteroceptors
• Interoceptors
• Proprioceptors (body image)
• Cutaneous sense
• Touch-pressure
• Cold-warmth
• Pain

7

• Cutaneous sense organ
• Ruffini endings heavy touch, pressure
• Merkels disks touch, low freq. vibration
• Meissners corpuscles light touch
• Paccinian corpuscles touch, vibration
• Free nerve ending pain

8

• Two systems in sensory transmission
• The dorsal column-Lemniscal System- localization
  touch system- fine touch system- vibratory
  sensation- position- pressure
• The anterolateral system / sys. spinothalamicus
  lateralis- pain- thermal sensation- tickle and
  itch sensation- sexual sensation- crude touch

9
TONGUE

• Has 2 important innervations
• N. lingualis (branch of N. trigeminus), innervate
  the pressure, touch and pain.
• N. facialis, innervate the taste

10
PAIN

• Sheringtons philosophy
• unique built-in unpleasant affect
• the physical adjunct of an imperative protective
  reflex

11
PAIN

• Is one of the somatic sensory modalities
• Receptor FREE NERVE ENDING
• Sensory peripheral nerve- Ad type
  (myelinated) for fast pain- C type
  (unmyelinated) for slow pain
• Medulla spinalis conduction- anterolateral
  system atau tractus spinothalamicus lateralis
• Center of perception and interpretation- gyrus
  post-centralis / SSA I

12

• Fast pain
• Also known as sharp pain, pricking pain, acute
  pain, electric pain.
• Occurs within about 0.1 seconds after pain
  stimulus applied
• Slow pain
• Begins after 1 second or more seconds after pain
  stimulus applied and then increases slowly.
• Also known as burning pain, aching pain,
  throbbing pain, nauseous pain, chronic pain.
• In which category DENTAL PAIN belongs to?

13
PAIN - Impuls pathways
S . S . A . I Gyrus Postcentralis
Thalamus
Tr. Spino- thalamicus
Free nerve endings
A ? / C
Med. Spinalis
14
Pain mechanism on Free Nerve Ending
Neurolemma / axolemma
Some substances
Free nerve ending
trauma
15
STIMULATIONS can generate PAIN
Mechanics , Thermal Chemical ,
Electrical Ischemia / infark Muscle spasm
16
Free nerve ending
Sensory nerve
17
Some substance
Traumatic Lesion
Action Potential
18
Some substance
Axolemma Permeability ??
Free nerve ending
Very easy to generate action potential
19
Some substance
Bradikinin Prostaglandin Histamin Substan
P Serotonin Leukotrien Enzim proteolitik dll.
20
Cephalgi
Causal
Extra cranial
Intra cranial
Spasme otot leher, kepala. Sinusitis, obstruksi
nasi. Febris, influenza dll.
21
Thalamus
Tempat relay / sinap
Impuls sensoris, kecuali
Olfactorius Otonomik
22
Thalamus
synonym kamar bertirai
Impuls Nyeri sinap di
Nuclei ventrobasal
23
S.S.A. I Gyrus postcentralis
Dibantu oleh SSA.II SSAA
Thalamus
Resume
Med. spinalis
Receptor
24
HOME WORK Bagaimana konduksi impuls
NYERI daerah wajah, gigi-geligi lidah ? Kirim
ke sjuhada_at_toughguy.net atau klik situs
www.sjuhada.educations.net Paling lambat 1 minggu