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Fasciculi tracts descending(contd)#2
this tract contains extra pyramidal fibers and has an origin of the superior colliculus of midbrain's tectum.
descend, tectospinal tract
Fibers in this tract cross as they_________. and they terminate in the upper 4 cervical cord levels.
Function of the tectospinal tract
extrapyramidal postural reflex enhancement dealing with sight and auditory stimuli.
Tectospinal tract, C.N. XI
The function of this tract is accomplished by adjustments to the trapezius&sternocleidomastoid muscles of the neck, moving the head (via what nerve?)
The origin of this tract is found in the Nucleus Ruber "red nucleus" of the midbrain's tegmentum.
What region of the red nucleus is the source of the rubrospinal tract fibers?
yes contralateral,midbrain as they descend
Does the rubrospinal tract cross? contr or ips? If so, where does it cross and when?
These fibers may reach all cord levels but predominately influence hand and foot musculature
Rubrospinal tract fibers
what tract fibers are strongly influenced by the cerebellum, and cerebral cortex?
function of rubrospinal tract
extrapyramidal muscle tone control primarily in contralateral hand and foot musculature.
corticospinal (tract functions), corticospinal system
some feel that the rubrospinal tract fibers may assume some of ______tract function when injury occurs in what system?
rubrospinal tract (fnctn)
primarily helps flexor muscles
Vestibulospinal Tract, M.O., Deiter's nucleus
this tract has extrapyramidal fibers, and origin of cell bodies is on the lateral part of the vestibular nucleus located in the_____and this nucleus can also be known as_____?
It is ipsilateral, fibers do not cross
Do fibers cross for vestibulospinal tract? Is it ips or contr?
This tract runs the entire cord length along the anterior-lateral funicular junction
function of the vestibulospinal tract
muscle tone and postural adjustment primarily in ipsilateral extensor musculature.
2nd function of the vestibulospinal tract
Maintains proper orientation in falling, and enhances spinal reflex capability.
Where is the location of the medial reticulospinal tract?
Medial reticulospinal tract
the origin of this tract's cell bodies is found in the Pons Tegmentum
Lateral reticulospinal tract
the origin of this tract's cell bodies is found in the M.O.
Medial and Lateral reticulospinal tracts
These tracts are mostly uncrossed.
Med.& Lat. reticulospinal
Name the tract(s) that terminates at all cord levels in medial parts of ventral horn or intermediolateral cells.
functions of Med. & Lat. reticulospinal tracts, corticospinal
Reflexes with Heart, blood pressure, resp. rates, and rhythms are carried to the cord through these tracts. It may also serve as a alternative pathway if what type of tract fibers are destroyed?
Fasciculus Proprius can also be called what?
spinospinal fibers, fasciculus proprius
what type of fibers (through what tract)-cell bodies originate in the cord and axons terminate in the cord
These tract fibers usually extend short distances up or down the cord, and have fibers that may or may not cross.
next to the gray horns, R/L lateral, anterior and posterior divisions
What is the location of the fasciculus proprius tracts and what are they often subdivided into?
function of the fasciculus proprius, ex. brachial plexus, (cord levels) C5-T1
vastly impt. coordination for spinal reflexes. give an example and what cord levels it would involve.
Fasciculus Proprius fibers
These are the first fibers to be myelinated in the fetus. Earliest spontaneous movements are integrated here as early as 10 wks.
Dorsolateral tract of Lissauer
Position of this tract is between Rexed lamina I and the posterior lateral sulcus of the cord.
DL tract of Lissauer
This tract is primarily composed of small diameter collateral fibers off posterior root axons.
DL tract of Lissauer collateral fibers, gray horns, lamina II
These type of fibers run short distances up or down the cord and synapse_______?often synapse in what lamina?
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