Ventral Spinocerebellar Tract
What type of movement does the ventral spinocerebellar tract give?
anticipated movement (voluntarily want to do something)
What are the receptors for the dorsal spinocerebellar tract?
GTOs and muscle spindles
Is information from cortex to cerebellum feedforward or feedback?
feedforward
What are the three (technically 4) nuclei of the cerebellum?
dentate, emboli form, globus, fastigial
What are the three layers of the cerebellar cortex
Molecular, Purkinje, and Granular
Where does this tract live
lamina 10
Can you explain the pathway this tract takes from GTO/Muscle spindle to the cerebellum?
Information comes from the GTO and muscle spindles travels through the dorsal root ganglion and then goes into lamina 5 and 6 and straight up into inferior cerebellar peduncle to cerebellum
ALL IPSILATERAL
Information comes from which lobes and what are the fibers called?
ALL LOBES
frontopontine fibers, parietopontine fibers, occipitopontine fibers, temperopontcne fibers, limbic fibers
What is the primary function and associated nucleus of the archiocerebellum/flocculonodular lobe?
primary function: vestibular system (balance, equilibrium, VOR)
associated nucleus: fastigial nucleus
What are the 5 types of cells (neurons)? What are the 2 types of fibers (input to cerebellum)?
Cells: basket, stellate, granule, purkinje, golgi
Fibers: mossy and climbing
How many times does this tract cross?
twice - once to get into lamina 8 and 9 and another time to get into the SCP
Where does clarks column exist?
C8-L3
All fibers have to go through the ____ capsule before going into the cerebellum. What happens if there is a stroke there?
internal capsule
stroke: cerebellum will not get correct information: motor control and correction will be an issue
What is the primary function and associated nucleus of the paleocerebellum/anterior lobe?
primary function: reticulospinal tract: helps set our tone and gets information from GTOs and muscle spindle at end of spinal cord
associated nucleus: interposed nucleus
Climbing fibers originate _____ enter through ____ cerebellar peduncle and have an ______ influence on deep nuclei and dendrites of purkinje cells
climbing fibers originate in the cell bodies in the inferior olivary nucleus and enter through the inferior cerebellar peduncle and have an excitatory influence on deep nuclei and dendrites of purkinje cells
What is the pathway for this tract?
lives in lamina 10 (receptors here- want to know what message was intended to go out) then crosses immediately to lamina 8 and 9 and travels up to then cross back over trough the superior cerebellar peduncle
Where does information go when it is in the face and above C8?
mesencephalic nucleus (located in midbrain)- comes in through semilunar ganglion and goes into the mesencephalic nucleus and into ICP to get unconscious proprioceptive information from face
IPSILATERAL
Information from GTOs and Muscle spindle come in through DRG and then into lamina 5 and 6, travel up the lateral funiculus, go in through the cuneoaccessory nucleus (cuneatus) to take the information to the ICP
IPSILATERAL
Explain the inferior olivary nucleus - what tract supplies its information? what is the pathway of this tract?
The inferior olivary nucleus gets its information from the reticulospinal tract it goes in through the inferior cerebellar peduncle and directly influences tone
What is the primary function and associated nucleus of the neocerebellum/ posterior lobe?
primary function: fine motor and error control (ex. how we use our hands and manipulate tools)
associated nucleus: dentate nucleus
Purkinje cells are (excited or inhibited) by the climbing fibers and granule cells and (excited or inhibited) by the basket and stellate cells. When excited they release (what neurotransmitter?) causing an inhibitory influence and therefore controlling movement
Purkinje cells are excited by the climbing fibers and granule cells and inhibited by the basket and stellate cells. When excited they release GABA causing an inhibitory influence and therefore controlling movement
A lesion of the VSCT would cause ipsilateral or contralateral issues?
Ipsilateral
Where does information go below L3?
Information from GTOs and Muscle spindle come in through DRG and then into lamina 5 and 6, travel up the funiculus gracilis (dorsal column) until it gets to L3 where we have the clark column and then travels into the ICP
IPSILATERAL
Explain the vestibular nuclei - where does it get its information? what is the pathway?
Information comes from the sauce and utricle (static) or semicircular canal (dynamic) it goes through the vestibular nuclei then through the inferior cerebellar peduncle to have an influence on head position/movement in space (balance and PC)
What is the function of the vermis region?
what is the function of the paravermal region?
what is the function of the lateral region?
vermis: axial/ trunk control
paravermal: limb girdle control
lateral: control of intermediate and distal segments of the extremities
Are mossy cells excitatory or inhibitory?
Explain what the mossy cells do/ their ultimate goal
Excitatory
Mossy cells have an excitatory influence on deep nuclei and dendrites of granule cells which ultimately excite purkinje, stellate and basket cells. When purkinje is excited it releases GABA therefore inhibiting leading to motor control