Special Sense Flashcards Preview

Adv Physio > Special Sense > Flashcards

Flashcards in Special Sense Deck (29)
Loading flashcards...

Tactile sensation

Touch, pressure,vibration(change in frequency) it is not a result of a single receptor


Touch sensation

Detected by tactile receptors which are found on the skin, close to the skin or deep


Pressure sensation

Result from deformation of deeper tissues, located in the skin or deep layers


Vibration sensation

Result from rapidly repetitive sensory organs, change in frequency of stimulation


Free nerve ending

Or sensory nerve ending, this is widely distributed on the skin, can detect touch and pressure, responds to different frequency


Meissener's corpuscle

Located at the point where the dermis meets the epidermis, it is an elongated encapsulated nerve ending fiber usually myelinated sensory nerve fiber present in fingertips and surrounded by connective tissue


Dermeral papillae

The invagination of where the meissners corpuscle meets the epidermis


Meissners corpuscle is what kind of receptor

Mechano receptor and exterioreceptor, and it can detect vibration


Merkel's disks

Found in the skin, tactile receptor, works with meissners corpuscle, the signal transmitted are adaptive therefore responsible for steady state signal that allow for determination of continuous touch of object against the skin..it is responsive to touch


Iggo dome receptor

It is Markels disk and neuron fiber


Hair end organ

Tactile receptor, sensory fiber wraps around the base of the hair follicle, movement of hair follicles activates the neuron, this a mechano and exterioreceptor


Ruffins end organ

Deep touch receptor in deep tissues, can be found in the visceral, and encapsulate, found in the joint corpuscle, important for proprial reception


Pacinian corpuscle

Pressure receptor, deep receptor, visceral eg pancreas, found in the dermis, the structure is layers of connective tissue, the sensory fiber are unmylinated. Pressure on this receptor causes the nerve fiber to fire giving a sensory pressure


Somatic sense

The nervous mechanism that collects sensory information from all over the body, that are not special sense, which touch, pressure, pain.


Somatic senses physiological types

Mechanoreceptive, thermo receptive, and pain



Mechanical distortion of the body tissues which gives rise to tactile and position sensation


Somatic sense location of receptors

Exteroreceptive, visceral, and deep


Sensory pathway to the somatosensory cortex

The information enters through the dorsal root to eithe the dorsal column medial lemniscal system or the antero-lateral system


Dorsal column medial lemniscal system

Defined information and important information come in through the dorsal root then travel up to the brain, first in the first order sensory Neuron, then second in the second order sensory neuron. In the medulla there is cross over to the opposite side of the brain, once in the medulla there is synapse then travel to thalamus to the sensory cortex


Anterol lateral system

Less defined information, crude information involving the ascending tracks, come into the dorsal root but afterward there is extensive synapsing and crossing over at the level of the spinal cord, afterwards ascending to the tract to the brainstorm , including the medulla synapses into the thalamus and sensory cortex


Somatosensory cortex

Located posterial to the centre sulcus or fissure, it has 50 distinct area called the brodman's area, the different part of the body is associated with different brodman's area


Somatosensory area 1

More critical and involves more information, for thigh, thorax, neck, shoulder,hands, finger, tongue etc


Somatosensory area 2

Information from the face, leg, face, arm


Association area

It's function is to refine the signal that are already perceived



Where the is damage to the association area leading to loss of definition of shape of something or texture


Lateral inhibition

As the signal goes up it can move in the lateral direction which can diminish the amount of the signal that moves up to the brain, interneurons prevents the radiation of the signals from moving laterally this strengthen the signal that the brain receives


Propriocetive sense

Involves the awareness of the body parts and position related to each other


Static proprioceptive sense

No movement and we can still detect our body parts


Kinesthesia or dynamic proprioceptive sense

Moving and knowing where your body parts are