Flashcards in 19.7 Deck (17):
Two types of skin?
Hairy skin - on most of body.
Glabrous skin - on palms of hands and soles of feet.
In ___ skin, there are ___ types of mechanoreceptors.
The 4 types of mechanoreceptors are: ___ ___, ___ ___, ___ ___ and ___ ___.
The two superficial mechanoreceptors of glabrous skin are ___ ___ and ___ ___.
The two deep mechanoreceptors of glabrous skin are ___ ___ and ___ ___.
Mechanoreceptors at different levels in the skin sense different ___, and sense ___ distortion of skin.
Mechanical distortion to receptor results in the opening of ___ channels, ___ influx and ___ of part of the axon.
Na+ channels, Na+ influx and depolarisation
Match the mechanoreceptor to function:
Meissner, Merkel, Pacinian, Ruffini, to:
Encodes rate of force.
Encodes grip force.
Encodes hand posture.
Meissner encodes rate of force.
Merkel encodes grip force.
Pacinian encodes vibrations.
Ruffini encodes hand posture.
Dermatomes refer to a region of skin supplied by a ___ ___
There are ___ pairs of spinal nerves.
All spinal nerves except ___ are sensory AND motor nerves.
___ is ONLY MOTOR.
C1 is motor ONLY.
Territories of skin of spinal nerves and peripheral nerves are ____
Peripheral nerves generally form plexuses -> not from one segment but from different segments.
Skin of the face is innervated by the ___ ___
The 3 branches of the trigeminal nerve are:
Trigeminal and spinal nerves (to skin of face and body) are ___ ___ fibres.
Large myelinated (due to lots of mechanosensitive fibres).
The cell bodies of somatosensory afferents are in the ___ ___ ___ (or ___ ___ for sensory afferents of face).
Dorsal root ganglion.