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tsm case 23 > TSM1.5 - Sensory Receptors > Flashcards

TSM1.5 - Sensory Receptors Flashcards

1
Q

Where is the cell body of motor neurones located?

A

In the spinal cord

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2
Q

Where is the cell body of sensory neurones located?

A

In the dorsal root ganglion

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3
Q

The Roman Numeral system of classification applies to which nerves?

A

Sensory nerves

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4
Q

What are the three types of motor nerves?

A

General Somatic Efferents (GSE)
Special Visceral Efferents (SVE)
General Visceral Efferents (GVE)

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5
Q

What are the four types of sensory nerves?

A

General Somatic Afferents (GSA)
Special Visceral Afferents (SVE)
General Visceral Afferents (GVA)
Special Sensory Afferents (SSA)

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6
Q

What is the developmental origin of General Somatic Efferents?

A

The neural tube

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7
Q

What is the developmental origin of Special Visceral Efferents?

A

Mesenchyme (branchial arches)

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8
Q

What is the target of general somatic efferents?

A

Skeletal muscle

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9
Q

What is the target of special visceral efferents?

A

Skeletal muscle

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10
Q

What is the target of general visceral efferents?

A

Smooth muscle and/or cardiac muscle

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11
Q

What is the general function of type Ia fibres?

A

Muscle spindle primary endings

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12
Q

What is the general function of type Ib fibres?

A

Golgi tendon organs

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13
Q

What is the general function of type II fibres?

A

Touch, kinaesthesia, muscle spindle secondary endings

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14
Q

What is the general function of type III fibres?

A

Pain, crude touch, pressure, and temperature.

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15
Q

What is the general function of type IV fibres?

A

Pain, touch, pressure and temperature.

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16
Q

What is the general function of type A-α fibres?

A

alpha-motoneurons, muscle spindle, Golgi tendon organs, touch

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17
Q

What is the general function of type A-β fibres?

A

touch, kinesthesia, muscle spindle

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18
Q

What is the general function of type A-gamma fibres?

A

touch, pressure, gamma-motoneurons

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19
Q

What is the general function of type A-δ fibres?

A

pain, crude touch, pressure, temperature

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20
Q

What is the general function of type B fibres?

A

preganglionic autonomic

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21
Q

What is the general function of type C fibres?

A

pain, touch, pressure, temperature, postganglionic autonomic

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22
Q

Which fibre has the largest diameter: Ia, Ib, or Ic?

A

Ia

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23
Q

Which fibre has the fastest conduction speed: I, II, or IV?

A

IV

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24
Q

What type(s) of neurone does the roman numeral system classify?

A

Sensory Neurones

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25
Q

What type(s) of neurone does the letter system classify?

A

Sensory and Motor neurones.

26
Q

Which fibre has the fastest conduction speed: A-α, A-δ, or C?

A

C

27
Q

Which fibre has the largest diameter: A-α, A-δ, or C?

A

A-α

28
Q

What sensation is detected by hair follicle receptors?

A

Motion/direction

29
Q

What sensation is detected by the Meissner corpuscle?

A

Tap, flutter 5-40Hz

30
Q

What sensation is detected by the Pacinian corpuscle?

A

Vibration 50-300Hz

31
Q

What sensation is detected by Merkel cells?

A

Touch - pressure

32
Q

What sensation is detected by the Ruffini corpuscle?

A

Skin stretch (slippage)

33
Q

What sensation is detected by free nerve endings?

A

Nociception

34
Q

What fibre type is the hair follicle receptor?

A

II

35
Q

What fibre type is the Meissner corpuscle?

A

II

36
Q

What fibre type is the Pacinian corpuscle

A

II

37
Q

What fibre type is the Merkel cells?

A

II

38
Q

What fibre type is the Ruffini corpuscle?

A

II

39
Q

What fibre type is the free nerve endings?

A

III (Aδ), IV (C)

40
Q

How big is the receptive field of the hair follicle receptor?

A

N/A, wraps around a single hair.

41
Q

How big is the receptive field of the Meissner corpuscle?

A

Small

42
Q

How big is the receptive field of the Pacinian corpuscle?

A

Large

43
Q

How big is the receptive field of the Merkel cells?

A

Small

44
Q

How big is the receptive field of the Ruffini corpuscle?

A

Large

45
Q

How big is the receptive field of the free nerve endings?

A

Various sizes.

46
Q

Describe the proprioceptive ascending pathway.

A

Proprioceptive fibres congregate in the dorsal root ganglion and then travel ipsilaterally up the Dorsospinocerebellar tract and contralaterally up the anterior spinocerebellar tract and finish in the cerebellum of the ipsilateral side.

47
Q

What are the two tracts that proprioceptive fibres can travel through?

A

The dorsospinocerebellar tract on the ipsilateral side and the anterior spinocerebellar tract on the contralateral side.

48
Q

Describe the ascending sensory pathway for pain/temperature.

A

Pain/temp fibres congregate in the dorsal root ganglion and then synapse first at the substantia gelatinosa. Then they travel on the contralateral side via the laterospinothalamic tract, then via the lateral lemniscus (from the pons) until they synapse in the thalamus on the contralateral side (from where they started). The final fibre travels from the thalamus to the somatosensory cortex, again on the contralateral side.

49
Q

What are the two tracts that pain/temp fibres travel via?

A

First the laterospinothalamic tract, then the lateral lemniscus.

50
Q

Describe the ascending sensory pathway for fine touch.

A

Fibres for fine touch congregate in the dorsal root ganglion, then travel ipsilaterally up the dorsal column until they synapse in the nucleus gracilis. At which point, they cross and travel contralaterally via the medial lemniscus until they synapse in the thalamus. Lastly, the final fibre travels from the thalamus to the somatosensory cortex (again on the contralateral side to which they began).

51
Q

What are the tracts that fine touch fibres travel via?

A

The dorsal column and the medial lemniscus.

52
Q

What type of fibre travels via the dorsospinocerebellar tract?

A

Proprioceptive fibres.

53
Q

What type of fibre travels via the dorsal column?

A

Fine touch fibres.

54
Q

What type of fibre travels via the lateral lemniscus?

A

Pain/temp fibres.

55
Q

What type of fibre travels via the anterior spinocerebellar tract?

A

Proprioceptive fibres.

56
Q

What type of fibre travels via the laterospinocerebellar tract?

A

Pain/temp fibres.

57
Q

What type of fibre travels via the medial lemniscus?

A

Fine touch fibres.

58
Q

What type of fibre synapse in the substantia gelatinosa?

A

Pain/temp fibres.

59
Q

What type of fibre synapse in the nucleus gracilis?

A

Fine touch fibres.

60
Q

Which types of fibre synapse in the thalamus?

A

Fine touch and pain/temp fibres.

61
Q

In what region(s) is the lateral horn present?

A

Lumbar and THORACIC regions.

tsm case 23 (3 decks)

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