the nervous pathway shandong university liu zhiyu
DESCRIPTION
The nervous pathway SHANDONG UNIVERSITY Liu Zhiyu. 一、 Sensory Pathways. 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. - PowerPoint PPT PresentationTRANSCRIPT
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
1. proprioceptive and fine touch pathway of trunk and limbs
I
II
VPL nucleus
Fasciculus gracilis
Fasciculus cuneatus
Medial lemniscus
III
Nucleus gracilisNucleus cuneatus
Spinal ganglion
Decussation of medial lemniscus
central thalamic radiations
1. proprioceptive and fine touch pathway of trunk and limbs
muscles,tendons,joints and periosteum Peripheral
processes I ipsilateral posterior funiculus of spinal cord
II
Gracile nucleus cuneate nucleus
III
supeior 2/3 of postcentral gyrus and posterior part of the paracentral lobule, Precentral gyrus
central thalamic
radiations
Posterior limb of internal capsule
Spinal ganglion
Central processes
Decussation of medial lemniscus
medial lemniscus
ventral posterolateral nucleus (VPL)
Fasciculus cuneatus (above T4)
Fasciculus gracilis (below T5)
Receptor for fine touch in skin
spinal ganglia
Ⅰ 、Ⅳ、Ⅶ of posterior horn spinothalamic tract
Spinal lemniscus
ventral posterolateral nucleus
central thalamic radiations
I
II
III
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
Peripheral processes I
II
III
supeior 2/3 of posterior gyrus and posterior part of the paracentral lobule
central thalamic radiations
Posterior limb of internal capsule
Spinal ganglion
Central processes Posterior root
ventral posterolateral nucleus (VPL)
Skin exteroceptor
Pain,temperature and simple touch pathway of trunk and limbs
Ⅰ 、Ⅳ、Ⅶ of posterior horn
lateral spinothalamic tract (pain and temperature)anterior spinothalamic tract (simple touch)
Ascending 1 - 2 segments
trigeminal ganglion
pontine nucleus of trigeminal n
spinal nucleus of trigeminal n.
Spinal tract of trigeminal n.
trigeminal lemniscus
ventral posteromedial nucleus (VPM)
central thalamic radiations
I
II
III
Peripheral processes
inferior 1/3 of posterior gyrus
central thalamic radiations
Posterior limb of internal capsule
Central processes
ventral posteromedial nucleus (VPM)
Skin and mucosa of head and face
Pain,temperature and simple touch pathway of head and face
trigeminal ganglion
Trigeminal n.
Root of trigeminal n.
pontine nucleus of trigeminal n.
spinal nucleus of trigeminal n.
II
trigeminal lemniscus
III
I
receptor
cone cell
rod cell
bipolar cell
Lateral geniculate
bodyOptic Radiation Both banks
of calcarine sulcus
Optic n.
Optic chiasma
ganglion cell
Decussation of fibers from nasal halves of retina
Fibers from temporal halves of retina uncrossed
Optic tract
(三) visual pathway
①
②
③
④
Blindness of eye of corresponding side
bitemporal hemianopia of visual field
Blindness in nasal half of visual field of corresponding side
Homonymous hemianopia of visual field in both eye
Pretectal region
2. pupillary reflexes
retina
Optic n.
Optic chiasma
Optic tract
Brachium of superior colliculus
Pretectal region
accessory nuclei of III
Oculumotot n.
Ciliary ganglion
Postganglionic fibers
Sphincter pupillae
Contraction of pupil
E-W nucleus
Ciliary ganglion
Oculumotot n.
The acoustic(auditory) pathway
cochlear ganglion
Spiral organ
cochlear nuclei
medial geniculate body
inferior colliculus
acoustic radiation
The acoustic(auditory) pathway
Spiral organ
cochlear ganglion
Cochlear nerve
cochlear nuclei
Trapezoid body
inferior colliculus
medial geniculate body
acoustic radiation transverse temporal gyriPosterior limb of
internal capsule
Lateral lemniscus
Brachium of inferior colliculus
I
II
VPL nucleus
Fasciculus gracilis
Fasciculus cuneatus
Medial lemniscus
III
Nucleus gracilisNucleus cuneatus
Spinal ganglion
Decussation of medial lemniscus
central thalamic radiations