19.7 Flashcards Preview

Week 19 > 19.7 > Flashcards

Flashcards in 19.7 Deck (17):
1

Two types of skin?

Hairy skin - on most of body.
Glabrous skin - on palms of hands and soles of feet.

2

In ___ skin, there are ___ types of mechanoreceptors.

Glabrous skin
4 types

3

The 4 types of mechanoreceptors are: ___ ___, ___ ___, ___ ___ and ___ ___.

Meissner corpuscles
Merkel complexes
Ruffini organs
Pacinian corpuscles

4

The two superficial mechanoreceptors of glabrous skin are ___ ___ and ___ ___.

Meissner corpuscles
Merkel complexes

5

The two deep mechanoreceptors of glabrous skin are ___ ___ and ___ ___.

Ruffini organs
Pacinian corpuscles

6

Mechanoreceptors at different levels in the skin sense different ___, and sense ___ distortion of skin.

Energies
Mechanical distortion

7

Mechanical distortion to receptor results in the opening of ___ channels, ___ influx and ___ of part of the axon.

Na+ channels, Na+ influx and depolarisation

8

Match the mechanoreceptor to function:
Meissner, Merkel, Pacinian, Ruffini, to:
Encodes rate of force.
Encodes grip force.
Encodes vibrations.
Encodes hand posture.

Meissner encodes rate of force.
Merkel encodes grip force.
Pacinian encodes vibrations.
Ruffini encodes hand posture.

9

Dermatomes refer to a region of skin supplied by a ___ ___

Spinal nerve.

10

There are ___ pairs of spinal nerves.

31

11

All spinal nerves except ___ are sensory AND motor nerves.
___ is ONLY MOTOR.

C1
C1 is motor ONLY.

12

Territories of skin of spinal nerves and peripheral nerves are ____

Different!
Peripheral nerves generally form plexuses -> not from one segment but from different segments.

13

Skin of the face is innervated by the ___ ___

Trigeminal nerve

14

The 3 branches of the trigeminal nerve are:

Ophthalmic nerve
Maxillary nerve
Mandibular nerve

15

Trigeminal and spinal nerves (to skin of face and body) are ___ ___ fibres.

Large myelinated (due to lots of mechanosensitive fibres).

16

The cell bodies of somatosensory afferents are in the ___ ___ ___ (or ___ ___ for sensory afferents of face).

Dorsal root ganglion.
Trigeminal ganglion.

17

There is only a ___ neuron from the periphery to the brain - this is a ___ neuron.

Single neuron!
Long