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motor nuclei of cranial nerves :)
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What is the origin of medial corticobulbar fibers?
Medial corticobulbar fibres arise as axons of the cells of "area 8" (frontal motor eye field)
What is the origin of lateral corticobulbar fibers?
They arise as axons of the cells in the lower1/3 of the motor area 4
Axons terminate in a series of fine extensions known as?
Nerve Endings. Axonal Terminals.
What is the bundle of axons called in the CNS?
Axons and dendrites that go to or from the same region of the body travel together in bundles, somewhat like telephone cables. A nerve is a bundle of axons and/or dendrites in the PNS. A bundle of axons and/or dendrites in the CNS is called a tract.for more info see link below
What are the subdivisions of pyramidal tracts?
Vestibulspinal tract (majority of its fibres are uncrossed)Olivospinal tractMedial Reticulospinal tract*mnemonic to memorize: V-O-MER
Function of olfactory tract?
The olfactory tract is a bundle of axons connecting the mitral and tufted cells of the olfactory bulb to several target regions in the brain.
What is the difference between corticobulbar tract and cortico spinal tract?
corticospinal tracts are the tracts of the upper motor neurons which originate in the cortex,(precentral gyrus). They terminate in the spinal cord by synapsing with the lower motor neurons either directly or through an interneuron. lesion to the corticospinal tract results in Spastic paralysis on the opp side if the lesion is above pyramidal decussation or before crossing over. Positive Babinski's sign loss of fine coordination in the distal limbs such as piano playing or typing
Neurons are composed of a network of fine threads called?
Axons of neurons terminate in a series of fine extensions known as dendrites.
What is the term used to describe the crossing over of a tract to the side of the nervous system opposite to where the axons originated?
Decussation
What is a group of axons bundled together coated in myelin that travels together through the body called?
Its called a tract; while a bundle of axons in the PNS is called a nerve
What are the origins for lateral spinothalamic and anterior spinothalamic tracts?
Lateral reticulospinal tract : It arises from the nuclei of reticular formation of the brain stem (mainly medulla)Medial reticulspinal tract : It arises from the nuclei of reticular formation of the brain stem (mainly pons)
Which cells from the anterior gray horn are the only ones that terminate in skeletal muscle cells?
Axons from the anterior gray horn are the only ones that terminate in skeletal muscle cells. This principle of the final common path to skeletal muscles has important practical implications.
