Sensory 4: Types of somatic sensations (Mechanoceptive & thermoceptive)

Question 1

First sensation affected by Diabetes & used for early diganostics for dorsal Column Degeneration

Answer 1

Vibration

Question 2

Static joint position definition and its receptors

Answer 2

Cortex is constantly aware of angle of joint

Receptors (slowly adapting/ tonic):
* Golgi tendon organ
* Muscle spindle receptors

Question 3

Kinetic Joint position, definition & receptors

Answer 3

Cortex is aware of rate of movement of joint

Receptors (rapidly adapting/Phasic):
* Pacillian corpuscle

Question 4

Define cortical sensations

Answer 4

Sensations that depend on the cortex for understanding

Question 5

Enumerate Cortical Sensations

Answer 5

1. Stereognosis
2. Graphathesia
3. Tactile Localization
4. Two point Discrimnation
5. Texture

Question 6

Receptors for Thermoreceptive sensation

Answer 6

Thermoreceptors (free nerve endings)

Question 7

Afferent fibers of Thermoceptive sensations

Answer 7

• Warm: C fibers
• Cold: A fibers

Question 8

Temperature range for warm receptors

Answer 8

30-45 degrees C

Question 9

Temeperature Range for Cold Receptors

Answer 9

10-40 degrees C (larger range than warm receptors)

Question 10

If temperature increases more than 45 degrees, what kind of receptors are activated

Answer 10

Warm Pain receptors

Question 11

If temperature decreases below 10 degrees, what kind of receptors are stimulated

Answer 11

Cold pain receptors, however at 0 degrees anesthesia occurs, where there are no receptors discharged

Question 12

Temperature range between 30-40 degrees is known as

Answer 12

Sensitive Area: where both types of receptors are discharged

Question 13

Thermoreceptors are numerous In

Answer 13

Lips & fingertips

Question 14

which type of Thermoreceptors is most common

Answer 14

Cold receptors, 4-10 more than warm receptors

Question 15

Explain when spatial summation of Thermoreceptors is allowed

Answer 15

They are widely spread, so wide area of skin must be exposed

Question 16

Adaptation of theremoreceptors occurs between

Answer 16

20-40 degrees C

Question 17

Which type of Receptor Adapts quicker

Answer 17

Warm receptors

Question 18

Components of Adaptation of thermoreceptors

Answer 18

1. Phasic Component: recptors adapt rapidly at first
2. Tonic Component: receptors continue to generate impulses at low frequency

Question 19

Explain Mechanism of thermoreceptors stimulation

Answer 19

Chemical Stimulation:
Change in metabolic rate causes change in Metabolites concentration, each 10 degrees increases causes double metabolites concentration

Question 20

Channels responsible for Theremoreceptors stimulation

Answer 20

TRP ion channel s (transient temperature receptor potential ion channels)