Extra Pyramidal Tracts of the decending tracts.pptx

A ppt on extra pyramidal tracts for mbbs 1st year students.

1. EXTRA PYRAMIDAL TRACT

2. EXTRA PYRAMIDAL TRACT:- 🔻Descending tracts of spinal cord other than pyramidal tracts are called Extra pyramidal tracts.

3. Extra pyramidal Tracts 1. Rubrospinal Tracts 2.Medial Reticulospinal Tracts 3. lateral Reticulospinal Tracts 4. Olivospinal Tracts 5. Vestibulospinal Tracts 6. Tectospinal Tracts

4. 1. Rubrospinal Tracts: 🔻Formed by axons of Red nucleus present in 🧠 Mid Brain 🔻 Fibers Cross to opposite side in the Tegmentum of mid brain 🔻 constituting the Ventral Tegmentum Decussation. 🔻Fibers Descend through pons & medulla and enters the Lateral White column of spinal cord. Red nucleus

5. 2. Medial Reticulospinal Tracts:- 🔻 Formed by Fibers from Reticular formation in pons. 🔻Descends to cervical segments only. 🔻lies in the Anterior White column of spinal cord. 🔻contains uncrossed fibers

6. 3. Lateral Reticulospinal Tracts:- 🔻originates from Reticular formation in brainstem. 🔻 Descends upto thoracic segments of spinal cord. 🔻 contains both crossed & uncrossed fibers 🔻lies in Anterolateral White column of spinal cord.

7. 4.Olivospinal Tracts:- 🔻 originates from Inferior olivory nucleus in medulla oblongata 🔻Lies in Anterolateral White column of spinal cord

8. 5. Vestibulospinal Tracts:- 🔻Arise from Lateral Vestibular nucleus 🔻 present at ponto- medullary junction 🔻 Descends Uncrossed 🔻Lies in Anterior White column of spinal cord

9. 6. Tectospinal Tracts:- 🔻originates from superior cellicular of mid brain. 🔻Fibers Cross to opposite side forming 'Dorsal Tegmental Decussation ' in mid Brain 🔻Lies in Anterior White column

10. 1. Regulation and integration of voluntary motor activity 2. Regulation and maintenance of muscle tone 3. Regulation and maintenance of emotional & associative movement Functions

11. 🔻Involuntary motor activity: Rhythmic & regular (Static tremor) Injury in Extra pyramidal Tracts: Dysrhythemic & irregular (chorea ,athetosis, dystonia) 🔻loss of swinging during walking 🔻 Bradykinesia

12. Thank you 😎