Last - Touch receptors and 2 point touch threshold test

Question 1

Location: They are widespread, superficial, and found in hairy and hairless skin.
Functions: Light touch, temperature, and pain.

Answer 1

Free nerve endings

Question 2

Location: A dendrite wrapped around a hair follicle.
Functions: Light touch when the hair is displaced.

Answer 2

Hair follicle receptors

Question 3

Location: Found in the dermal papillae of hairless skin.
Functions: Light touch and low-frequency vibration.

Answer 3

Meissner’s corpuscles

Question 4

Location: Found in the stratum basale of hairy and hairless skin.
Functions: Pressure touch

Answer 4

Merkel’s nerve complex

Question 5

Location: In the dermis, joint capsules, some viscera, genitals, and breasts.
Functions: High frequency vibration, pressure, stretch, and tickling.

Answer 5

Lamellated or Pacinian corpuscles

Question 6

Location: In the dermis and joint capsules.
Functions: Pressure touch

Answer 6

Ruffini’s cylinders

Question 7

What test is used to determine sensitivity?

Answer 7

Two-point touch threshold test

Question 8

How is the two-point threshold test conducted?

Answer 8

1. Obtain a caliper and set the jaws 3 cm apart.
2. Ask your partner to close their eyes and lightly touch your partner with the caliper.
3. If your partner can feel two separate points of contact, reduce the distance between the jaws of the caliper incrementally 2 mm, until your partner feels only one point of contact.

Question 9

Rank the following regions according from the least to most sensitive: fingertips, elbow, forearm, palm of hand.

Answer 9

Elbow -> forearm -> palm of hand -> finger tips