1 / 9

Extrapyramidal Tracts

Extrapyramidal Tracts. Extra Pyramidal Tracts. Include all motor Tracts other than Pyramidal Tract. Rubrospinal Tract - Reticulospinal Tract Vestibulospinal Tracts Tectospinal Tract Olivospinal Tract Medial longitudinal Bundle. About all these Tracts U must Know:

maryannj
Download Presentation

Extrapyramidal Tracts

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Extrapyramidal Tracts

  2. Extra PyramidalTracts. Include all motor Tracts other than Pyramidal Tract. • Rubrospinal Tract - • Reticulospinal Tract • Vestibulospinal Tracts • Tectospinal Tract • Olivospinal Tract • Medial longitudinal Bundle. About all these Tracts U must Know: 1. Origin 2. Course. 3. Relay & Functions

  3. Rubrospinal tract Origion: Red Nucleus in the mid brain- (Magnocellular Part) Course: Cross to opposite Side forming Ventral Tegmental Decussation. Descend through pons & medullary reticular formation. Relay. Mostly on ά-motor neurons throughInternuncialNeurons Functions: - Control Mainly crude movements . - Facilitate flexor muscles tone

  4. Reticulospinal Tract • Origion: two Types. • 1. Anterior-(Pontine) • 2. Lateral ( Medullary) Majority of Fibers do not Cross to the opposite side after their Origin. -Fibers of Ant. Tract (Pontine) are Situated Lateral to the anterior Corticospinal tract in the spinal cord. - Mostly end ongamma Motor Neurons . Function: Facilitatory to gamma motor Neurons Supplying Muscle Spindles (Self Excitatory)- Hence involved in Muscle Tone

  5. Lateral (Medullary)Reticulospinal Tract Arises from Medullary Reticular formation. Under the control of : • Cerebral cortex • Cerebellum 3. Basal ganglia Situated in the Anterior Part of Lateral Funiuculus • Mostly Uncrossed Function: Inhibitory to gamma Motor Neurons supplying Muscle Spindles. BALNCE B/W Excitation & Inhibition

  6. Facilitation & Inhibition of Stretch Reflex (Reticulospinal Tract) by different Brain Areas 1. MotorCortex 2. BasalGanglia 3. Cerebellum 5.(Pontine)Excitatory ReticularFormation 6.(Medullary) Inhibitory Ret. formation

  7. Tectospinal Tract • Origin: Arises from Tectum(Sup. & Inf. Colliculi) • Decussate to opposite side forming DorsalTegmental decussation • Descend in the spinal cord in & relay at diff. Levels Functions: Mainly Concerned with Reflex & Postural movements of Head & Neck in response to Visual & Auditory Stimuli

  8. Olivospinal Tract Origin:Arises from inferior Olivary nucleus in the Medulla Oblongata. Crosses to the opposite side Descends in lateral white funiculus of the spinal cord. Fibers descend in the spinal cord but don’t relay below cervical segments. • Functions: Control of movements in response to proprioceptive stimuli

  9. Medial longitudinal Fasciculus • Mixed Origin. • Originates a little above the Mid Brain from Interstitial ,superior Colliculi, vestibular Nuclei • Descends on the medial side in Post. Part of Ant. Funiculus. • Includes fibers from 3rd. 4th & 6th Cranial nerves Nuclei, & Auditory Nuclei. • Regulates Coordination of Reflex Movements related to Eye, Neck & other parts of the body.

More Related