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Neurohistology > Lecture 3- Sensory receptors > Flashcards

Lecture 3- Sensory receptors Flashcards

1
Q

5 types of receptors

A 
Somatic and visceral
Proprioceptors
Chemoreceptors
Audioreceptors
Photoreceptors
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2
Q

Classification criteria

A 
Origin of stimulus (interoreceptors vs exteroreceptors)
Stimulus detected
Structural complexity (encapsulated vs unencapsulated)
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3
Q

Unencapsulated receptors of skin

A

Merkel cells
Free nerve endings
Root hair plexus

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4
Q

Encapsulated receptors of skin

A

Meissner’s corpuscles
Pacinian corpuscles
Krause end bulbs
Ruffini corpuscles

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5
Q

Proprioceptors

A

Muscle spindles
Golgi tendon organs
Joint kinesthetic organ

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6
Q

Muscle spindles

A

Detect distention in surrounding extrafusal muscle fibers
Concentric layers of flattened cells with interstitial fluid and intrafusal muscle fibers
Encapsulated by modified perimysium

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7
Q

Golgi tendon organ

A

Encapsulated
Encloses sensory axons and collagen bundles
At myotendinous junction
Detects changes in tension in contracting muscles and inhibit motor nerve activity if tension becomes excessive

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8
Q

Joint kinesthetic receptors

A 
Monitor stretch in articular capsule of synovial joints
receptor subtypes
Pacinian corpuscles
Ruffini corpuscles
Free nerve endings
Tendon organs
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9
Q

Merkel cells

A

Sustained light touch and object texture

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10
Q

Free nerve endings

A

Temperature, pain, itching, tactile receptor

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11
Q

Root hair plexus

A

Detects hair movement

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12
Q

Meissner corpuscles

A

Light touch and low frequency touch

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13
Q

Pacinian corpuscles

A

Course touch, pressure and vibrations

Bowel and bladder too

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14
Q

Krause end bulbs

A

Low frequency vibrations

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15
Q

Ruffini corpuscles

A

Stretch or torque of skin

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16
Q

Proprioceptors

A 
In striated muscles and myotendinous junctions
Respond to position and movement
Muscle spindles
Golgi tendon organs
Joint kinesthetic receptors
17
Q

Muscle spindles

A

Stretch detectors in muscle fascicles
Encapsulated by modified perimysium with concentric layers of flattened cells, containing interstitial fluid and a few thin intrafusal fibers
Detect distension of surrounding extrafusal muscle fibers and relays info to spinal cord

18
Q

Gogli tendon organ

A

Encapsulated structures that enclose sensory axons penetrating among the collagen bundles at the myotendinous junction
Detect changes in tension produced by muscle contraction and act to inhibit motor nerve activity

19
Q

Joint kinesthetic receptors

A

Proprioceptors that monitor stretch in the articular capsules that enclose synovial joints
Contains 4 receptor types
- Lamellar corpuscles
- Ruffini corpuscles
- Free nerve endings
- Receptors resembling golgi tendon organs
Provide info on joint position and motion

20
Q

Ganglion definition

A

Collection of cell bodies of the CNS

Neurohistology (5 decks)

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