Chapter 3: SENSORY PHYSIOLOGY Flashcards
IDENTIFY
Large and medium-sized myelinated fibers
Type A NERVE FIBERS
IDENTIFY
Unmyelinated nerve fibers
Type C NERVE FIBERS
What is the Alternative Classification
A-α
General Classification
Ia (Annulospiral endings)
Ib: Golgi Tendon Organs
Alternative Classification
MWhat is the Motor Function?
A-α
General Classification
Skeletal muscle (GTOs)
Motor Function
What is the Alternative Classification?
A-β and A-γ
General Classification
II (Flower-spray endings)
Alternative Classification
What is the Motor Function?
A-β and A-γ
General Classification
Muscle Spindle
Motor Function
What is the Alternative Classification
A-δ
General Classification
III: Temperature, crude touch, and prickling pain sensations
Alternative Classification
Alternative Classification
C
General Classification
IV: fibers carrying pain, itch temperature, and crude touch
Alternative Classification
What is the Motor Function?
C
Sympathetic fibers
Motor Function
Sensory Receptors
Detect mechanical compression or stretching
Mechanoreceptors
Sensory Receptors
Detect changes in temperature
Thermoreceptors
Sensory Receptors
Detect physical-chemical damage
Nociceptors
Sensory Receptors
Detect light on the retina of the eye
Electromagnetic receptors
Other Sensations
Relates to physical state of the body
Proprioceptive sensation
Other Sensations
Viscera of the body
Visceral sensation
Other Sensations
Deep tissues
Deep sensation
Tactile Receptors
Touch, pressure, tickle, and itch, pain
Free Nerve Endings
Tactile Receptors
Present in the non-hairy parts of the skin
Localized touch, texture, and low frequency vibration, surface movement
Meissner’s Corpuscles
Tactile Receptors
Slow adaptation
Continuous touch, localized touch, texture
Merkel’s Discs
Tactile Receptors
Deeper internal tissues and joints
Heavy prolonged touch, pressure, and degree of joint rotation, heat
Ruffini’s Endings
Tactile Receptors
Beneath the skin and deep in the fascial tissues
High-frequency vibration and pressure
Pacinian Corpuscles
Sensory Pathways
Carries signals upward to the medulla of the brain mainly in the dorsal columns of the cord.
Then, after the signals synapse and cross to the opposite side in the medulla, they continue upward through the brain stem to the thalamus by way of the medial lemniscus
DORSAL COLUMN- MEDIAL LEMNISCUS PATHWAY
composed of large, myelinated nerve fibers that transmit signals to the brain at velocities of 30 to 110 m/sec
DORSAL COLUMN- MEDIAL LEMNISCAL SYSTEM
Synapse in the dorsal horns of the spinal gray matter, then cross to the opposite side of the cord and ascend through the anterior and lateral white columns of the cord. They terminate at all levels of the lower brain stem and in the thalamus
ANTEROLATERAL SYSYTEM
Composed of smaller myelinated fibers that transmit signals at velocities ranging from a few meters per second up to 40 m/sec
ANTEROLATERAL SYSYTEM
Transmit a broad spectrum of sensory modalities, such as pain, warmth, cold, and crude tactile sensations
ANTEROLATERAL SYSYTEM
Primary sensory cortex/ somesthetic area
Located: postcentral gyrus
BRODMANN AREA 3,1,2
The primary sensory projection cortex for sensory information received from the skin, mucosa, and other tissues of the body and face
Brodmann Area 3,1,2
From the thalamic radiations, this area receives fibers that convey touch and proprioceptive (muscle, joint, and tendon) sensations from the opposite side of the body
Brodmann Area 3,1,2
