Transcript central thalamic radiation

The nervous pathway
SHANDONG UNIVERSITY
Liu Zhiyu
一、
Sensory Pathways
1. proprioceptive and fine touch
pathway of trunk and limbs
1. proprioceptive and fine touch pathway of
trunk and limbs
Primary Neuron
 Cell bodies are located in the ganglion of spinal n.
 transmit sensory input from joint, muscle, tendon
to the posterior funiculus of the spinal cord
 form the Fasciculus cuneatus and Fasciculus
gracilis
1. proprioceptive and fine touch pathway of
trunk and limbs
Secondary Neuron
Cell bodies are located in Nucleus gracilis and
Nucleus cuneatus
Send out fibers Cross to the opposite by
decussation of medial lemniscus
Ascends as medial lemniscus
Third Neuron
cell bodis are located in the thalamus
send out fibers to form central thalamic
radiation project to the somatic sensory cortex
VPL nucleus
III
Medial
lemniscus
Nucleus gracilis
Nucleus cuneatus
central
thalamic
radiations
Decussation of
medial lemniscus
II
Spinal ganglion
I
Fasciculus
cuneatus
Fasciculus
gracilis
1. proprioceptive and fine touch pathway of trunk and limbs
muscles,tendon
s,joints and
periosteum
Receptor for fine
touch in skin
Spinal ganglion
Central processes
Peripheral
processes
I
ipsilateral posterior
funiculus of spinal cord
Gracile nucleus
Fasciculus gracilis cuneate nucleusDecussation of
(below T5)
medial lemniscus
Fasciculus
cuneatus
II
(above T4)
ventral posterolateral
central thalamic
nucleus (VPL)
radiations
Posterior limb of
III
internal capsule
medial
lemniscus
supeior 2/3 of postcentral
gyrus and posterior part
of the paracentral lobule,
Precentral gyrus
Pain,temperature and simple
touch pathway of trunk and limbs
ventral
posterolateral
nucleus
III
Ⅰ、Ⅳ、Ⅶ of
posterior horn
II
spinal ganglia
I
central thalamic
radiations
Spinal lemniscus
spinothalamic tract
Pain,temperature and simple touch pathway of
trunk and limbs
Primary Neuron
• Cell bodies are located in the ganglion of spinal n.
• Relay sensory input from the periphery to the
posterior horn of the spinal cord
• Synapses with the secondary neurons in the
posterior horn of spinal cord
Pain,temperature and simple touch pathway of
trunk and limbs
Secondary Neuron
located in the Ⅰ、Ⅳ、Ⅶ of posterior horn of spinal
cord
Send out fibers cross to the opposite side through
the anterior white commissures and form the
spinothalamic tract
Third Neuron
the third neurons located in the thalamus
send out fibers to form central thalamic radiation
project to the somatic sensory cortex
Pain,temperature and simple touch pathway of trunk
and limbs
Spinal ganglion
Skin
exteroceptor
Central processes
Peripheral
processes
Posterior root
I
Ⅰ、Ⅳ、Ⅶ of
posterior horn
Ascending 1 - 2 segments
II
lateral spinothalamic tract (pain and temperature)
anterior spinothalamic tract (simple touch)
ventral posterolateral
nucleus (VPL)
central thalamic radiations
III
Posterior limb of
internal capsule
supeior 2/3 of posterior
gyrus and posterior part
of the paracentral
lobule
Pain, temperature and simple touch
pathway of head and face
ventral posteromedial
nucleus (VPM)
III
pontine nucleus
of trigeminal n
II
central thalamic
radiations
trigeminal ganglion
I
trigeminal
lemniscus
Spinal tract of
trigeminal n.
spinal nucleus of
trigeminal n.
Pain,temperature and simple touch pathway of
head and face
trigeminal ganglion
Skin and
mucosa of
head and face
pontine nucleus
of trigeminal n.
Central processes
Trigeminal n.
Peripheral
processes
I
Root of trigeminal n.
ventral posteromedial
nucleus (VPM)
trigeminal lemniscus
II
spinal nucleus of
trigeminal n.
central thalamic radiations
Posterior limb of internal capsule
III
inferior 1/3 of
posterior gyrus
receptor
Spinal ganglion
cortex of
paleocerebellum
（三）visual
pathway
（三）visual pathway
receptor
bipolar cell
ganglion cell
Optic n.
cone cell
rod cell
Optic chiasma
Lateral geniculate
body
Decussation of fibers from
nasal halves of retina
Optic tract
Fibers from temporal
halves of retina uncrossed
Optic Radiation
Both banks
of calcarine
sulcus
①
Blindness of eye of
corresponding side
② bitemporal hemianopia of
visual field
③ Blindness in nasal half of
visual field of corresponding
side
④ Homonymous hemianopia
of visual field in both eye
2.
pupillary reflexes
retina
Optic n.
Contraction
of pupil
Sphincter pupillae
Optic
chiasma
Ciliary
ganglion
Postganglionic
fibers
Oculumotot n.
Optic tract
Ciliary ganglion
Brachium of
superior
colliculus
Pretectal
region
E-W nucleus
Oculumotot n.
accessory
nuclei of III
Pretectal region
2.
pupillary reflexes
The acoustic(auditory) pathway
medial geniculate body
acoustic radiation
inferior colliculus
cochlear nuclei
Spiral organ
cochlear ganglion
The acoustic(auditory) pathway
cochlear
nuclei
cochlear ganglion
Trapezoid body
Spiral organ
Cochlear
nerve
inferior
colliculus
Lateral lemniscus
medial
geniculate body
acoustic radiation
Brachium of
inferior colliculus
Posterior limb of
internal capsule
transverse
temporal
gyri
VPL nucleus
III
Medial
lemniscus
Nucleus gracilis
Nucleus cuneatus
central
thalamic
radiations
Decussation of
medial lemniscus
II
Spinal ganglion
Fasciculus
cuneatus
I
Fasciculus
gracilis
ventral
posterolateral
nucleus
III
Ⅰ、Ⅳ、Ⅶ of
posterior horn
II
spinal ganglia
I
central thalamic
radiations
Spinal lemniscus
spinothalamic tract