Sensory Receptors (Quiz 3)

Question 1

An area (“cut” or “slice”) of the skin that is a combination of the receptive field of the sensory axons originating from a single spinal nerve

Answer 1

Dermatome

*Named according to the spinal nerve that supplies them

**Form into bands around the trunk but their limb organization is more complex, as a result of embryological development

***With loss of function of a single spinal nerve, sensation from the dermatome it supplies is not completely lost, due to overlap. There is, however, reduced sensitivity

Question 2

Upper Limb Dermatomes

Answer 2

• C5
• C6
• C7
• C8
• T1

Question 3

Dermatome of the Lateral Shoulder and Arm

Answer 3

C5

Question 4

Dermatome of the Thumb and Index Finger

(Radial Border of the Hand)

Answer 4

C6

Question 5

Dermatome of the Middle Finger

Answer 5

C7

Question 6

Dermatome of the Digiti Minimi

(Ulnar Border of the Hand)

Answer 6

C8

Question 7

Dermatome of the Medial Elbow

Answer 7

T1

Question 8

Thoracic Dermatomes

Answer 8

T2-T12

*Intercostal nerves form segmental strips on the thorax

Question 9

Dermatome band that goes across the Umbilicis

Answer 9

T10

Question 10

Subcostal nerve that supplies the Dermatome that goes across the upper edge of the pubic bone

Answer 10

T12

Question 11

Group of sensory receptors found in the dermis or epidermis

Answer 11

Cutaneous Receptors

Question 12

Superficial layers of hairless skin

Answer 12

Glabrous Skin

*found in area such as fingertips and lips

Question 13

Two Cutaneous Receptors found in the upper most part of the Dermis (especially in glabrous skin)

Sense fine (discriminative) touch

Answer 13

• Merkel Cells
• Meissner Corpuscles

Question 14

Cutaneous Receptors found in glabrous skin

Sensitive to skin stretch

Monitor slippage of objects along the surface of the skin, allowing for modulation of grip on an object

Answer 14

Ruffini Corpuscles

Question 15

Receptors found deeper in the skin and subcutaneous tissue

Detect “deep touch” (pressure)

Answer 15

Pacinian Corpuscles

Question 16

Unmyelinated terminal branches of a neuron

No connective tissue capsule

Answer 16

Naked (free) Nerve Endings

Ex. Nociceptors

Question 17

Neurons that have a connective tissue capsule surrounding accessory structures

Are often refered to as sense organs

Answer 17

Encapsulated Sensory Receptors

Ex. Pacinian Corpuscles

Question 18

Sensory Receptors the respond to Light

Answer 18

Photoreceptors

Question 19

Sensory receptors that respond to Chemical Stimulus

Answer 19

Chemoreceptors

Ex. Smell, Taste

Question 20

Sensory receptors that respond to Tempurature

Answer 20

Thermoreceptors

Question 21

Receptors that respond to mechanical stress

Depolarize when their membranes are physically stretched

Answer 21

Mechanoreceptors

Question 22

Damage to the Nervous System, due to disease or trauma, may cause

Answer 22

Neuropathic Pain

Aka Neurogenic Pain

Question 23

Stimulation of a nociceptor may cause

Answer 23

Nociceptive Pain

Question 24

The Two Major types of Nociceptors

Answer 24

• A-Delta
• C. AKA C-PMN (Polymodal)

Question 25

The ability to know where your body is in space, without the use of vision

Answer 25

Proprioception

Question 26

2 Examples of Proprioception

Answer 26

* Muscles Spindles * Golgi Tendon Organs

Question 27

Muscle spindles detect

Answer 27

* Rate of change in muscle length (stretch) * Static length of a muscle (tone)

Question 28

Distributed throughout the fleshy part of skeletal muscle Found in greatest abundance in muscle capable of delicate, fine, contractile ability

Answer 28

Muscle Spindles

Question 29

Muscle spindles are especially abundant in the small muscles of the? (2)

Answer 29

* Hand * Foot \* Muscle spindles are scarce in the tongue and ocular muscles

Question 30

The unipolar neuron coming from a muscle spindle is refered to as a

Answer 30

1a fibre

Question 31

Sensory receptors located within a muscle are called?

Answer 31

Muscle Spindles

Question 32

Muscle Spindles consist of the peripheral axons of 1a sensory neurons (unipolar) and what kind of muscle fibres?

Answer 32

Intrafusal muscle fibres

Question 33

Muscle Spindles are what kind of receptors?

Answer 33

Mechanoreceptors \*respond to stretch and signal changes in muscle length

Question 34

Muscle Spindles communicate information of where the body is in space (proprioception) and how fast body limbs are moving in space (velocity) to what?

Answer 34

CNS

Question 35

Sensitivity of detecting changes in muscle length is adjusted by

Answer 35

Gamma Motor Neurons