GSA Flashcards
Fibers carry exteroceptive info from receptors in the skin that mediate pain, temp and touch
GSA
4 types of somatic sensation
- pain
- thermal
- position
- touch pressure
Act as a transducers transforming a physical stimulus into a nerve impulse
Sensory receptors
Process in which a stimulus receptor is specialized and is transformed by the receptor membrane into a generator potential
Transduction
Endings for sensing visceral pain and receptors in joints that respond to body position
Interoceptive
Also known as medial lemniscal system
Dorsal column system
Separates the medial and lateral nuclear masses and bifurcates anteriorly to encompass the anterior group
Internal medullary lamina
What theory states that different receptors detect each different quality of sensation
Fiber specific theory
Type of muscle afferent fiber that has a annulospinal endings of neuromuscular spindle
Ia
It divides the thalamus unequally
IntErnal medullary lamina
Enclosed within lateral internal medullary lamina
IntRALAMINAR nuclei
Located in the postcentral gyrus also known as brodmann area 3,2,1
Primary sensory cortex
Aka anterolateral system
Spinothalamic tract
Subserves pain, thermal sensation and crude touch
Spinothalamic system
Subserves deep touch, tactile sensation, conscious proprioception, pressure and vibratory sense
Dorsal column system
Ability to identify objects
Stereognosis
Ability to identify figures and numbers drawn through skin
Graphesthesia
Dorsal root ganglion
Neuron 1 (First order neuron
Crossing of fibers
Neuron 2
Pathway for fast sharp pain (subserves pain and thermal sense)
Lateral spinothalamic tract
VPL of thalamus
Neuron 3
Secretes substance P for pain sensation
Subtancia gelatinosa (Lamina II)
Subserves light touch, tickle and sexual sensation pathway
Anterior spinothalamic tract
Refers to unsteady , awkward and poorly coordinated movement
Ataxia
Used to detect posterior column ataxia
Romberg sign
A cerebellar input which is relayed from the body via several pathway
Unconscious priprioception
Other general sensory ascending tract concerned with the lower limbs
Anterior and posterior spinocerebellar tracts
Other general sensory ascending pathway that is concerned with fine coordination of individual muscles during posture and movement
Dorsal spinocerebellar tract
Other general sensory ascending tract responsible for unconscious proprioception
Cuneocerebellar tract
Fibers from upper 6 thoracic and all
Fasciculus cuneatus
