Fine Touch and Crude Touch
Fine touch, (or discriminative touch), is a sensory modality which allows a subject to sense and localise touch. The form of touch where localisation is not possible is known as crude touch. The posterior column-medial lemniscus pathway is the pathway responsible for the sending of fine touch information to the cerebral cortex of the brain.
Crude touch (or non-discriminative touch) is a sensory modality which allows the subject to sense that something has touched them, without being able to localize where they were touched (contrasting "fine touch"). Its fibres are carried in the spinothalamic tract. Unlike the fine touch which is carried in the dorsal column
As fine touch normally works in parallel to crude touch, a person will be able to localize touch until fibres carrying fine touch (Posterior column-medial lemniscus pathway) have been disrupted. Then the subject will feel the touch, but be unable to identify where they were touched.
Read more about this topic: Somatosensory System
Famous quotes containing the words fine, touch and/or crude:
“Yet when the houre of thy designe
To answer these fine things shall come,
Speak not at large, say, I am thine;
And then they have their answer home.”
—George Herbert (1593–1633)
“So unrecorded did it slip away,
So blind was I to see and to foresee,
So dull to mark the budding of my tree
That would not blossom yet for many a May.
If only I could recollect it, such
A day of days! I let it come and go
As traceless as a thaw of bygone snow;
It seemed to mean so little, meant so much;
If only now I could recall that touch,
First touch of hand in hand—Did one but know!”
—Christina Georgina Rossetti (1830–1894)
“On the pavement
of my trampled soul
the soles of madmen
stamp the prints of rude, crude words.”
—Vladimir Mayakovsky (1893–1930)