Upload
anonymous-t5tdwd
View
218
Download
0
Embed Size (px)
Citation preview
7/27/2019 18 Spinocerebellar Tract
1/26
7/27/2019 18 Spinocerebellar Tract
2/26
Spinocerebellar Tracts
7/27/2019 18 Spinocerebellar Tract
3/26
Pathways to the Cerebellum
n Posterior Spinocerebellar tract
nAnterior Spinocerebellar tract
7/27/2019 18 Spinocerebellar Tract
4/26
Posterior Spinocerebellar
Tractn Function
n Coordination of limb movementsn Maintenance of posture
n Locationn Posterolateral part of the lateral white
funiculus
7/27/2019 18 Spinocerebellar Tract
5/26
7/27/2019 18 Spinocerebellar Tract
6/26
7/27/2019 18 Spinocerebellar Tract
7/26
7/27/2019 18 Spinocerebellar Tract
8/26
7/27/2019 18 Spinocerebellar Tract
9/26
7/27/2019 18 Spinocerebellar Tract
10/26
Posterior Spinocerebellar
Tract3.It lies at the surface of the spinal
cord.
4.Fibres in the tract project ipsilaterally,--To the vermis of the cerebellum through the
inferior cerebellar peduncle.
5.The posterior spinocerebellar tract is
principally concerned with the ipsilateralleg.
7/27/2019 18 Spinocerebellar Tract
11/26
7/27/2019 18 Spinocerebellar Tract
12/26
7/27/2019 18 Spinocerebellar Tract
13/26
Anterior Spinocerebellar
Tractn Function.
n Mainly concerned with movements of thelimbs as whole.
n Receptors come from.n The trunk.n The upper limbs.n The lower limbs.
7/27/2019 18 Spinocerebellar Tract
14/26
Anterior Spinocerebellar
TractFirst order neurons.
1.Cells in the body of the
lumbosacral posterior horn,together with.
-Cells on the lateral surface of the
anterior horn (spinal border cells).---Give rise to the anteriorspinocerebellar tract.
7/27/2019 18 Spinocerebellar Tract
15/26
Anterior Spinocerebellar
Tract2.The inputs to these tract cells are more
complex than those of the
posterior spinocerebellar tract.They come.
---From group I muscle afferent (mainlyGolgi tendon organs),
---From a wide variety ofcutaneousreceptors including spinal interneuronsand from fibres of descending tracts.
7/27/2019 18 Spinocerebellar Tract
16/26
Anterior Spinocerebellar
TractSecond order neurons.
1.Neurons are located in the nucleus
dorsalis of clarke.2.The tract is crossed at the level of the
spinal cord, in contrast to the posteriorspinocerebellar tract.
3.These fibers are located on to theventrolateral aspect of lateral whitefuniculus.
7/27/2019 18 Spinocerebellar Tract
17/26
7/27/2019 18 Spinocerebellar Tract
18/26
Anterior Spinocerebellar
Tract5.It enters the cerebellum via the
superior cerebellar peduncle.
6.Most of its fibres recross the midlinebefore ending in the vermis of the
anterior lobe.
7/27/2019 18 Spinocerebellar Tract
19/26
Anterior Spinocerebellar
Tract7.Thus, the fibres of the anterior
spinocerebellar tract ultimately end
in the cerebellum on the ipsilateralside to their origin.
7/27/2019 18 Spinocerebellar Tract
20/26
Cuneocerebellar Tract1.Most spinocerebellar-type afferents that
enter in cervical and upper thoracicsegments do not project to nucleusdorsalis.
2.They travel in the fasciculus cuneatus,
---To a nucleus in the medulla,
---Analogous to nucleus dorsalis,---Called the lateral (or external)
cuneate nucleus.
7/27/2019 18 Spinocerebellar Tract
21/26
Cuneocerebellar Tract3.It is located just lateral to the
nucleus cuneatus.
4.Axons of these cells form thecuneocerebellar tract.
5.They also project ipsilaterally to
the vermis of the cerebellumthrough the inferior cerebellarpeduncle.
7/27/2019 18 Spinocerebellar Tract
22/26
7/27/2019 18 Spinocerebellar Tract
23/26
Spino-olivary Tractn Function.
n Conveys information to the cerebellumfrom cutaneous and proprioceptive organs.
7/27/2019 18 Spinocerebellar Tract
24/26
7/27/2019 18 Spinocerebellar Tract
25/26
Spino-olivary Tractn Third order neurons.
n Located in the inferior olivary nucleus ofthe medulla oblongata.
nAxons of the third order neurons cross themidline and enter the cerebellum theinferior cerebellar peduncle.
7/27/2019 18 Spinocerebellar Tract
26/26