1 / 26

Medulla Oblongata (bulbus/medulla)

Medulla Oblongata (bulbus/medulla). Prof. Dr. Selda Önderoğlu. Medulla Oblongata. The most inferior part of brain stem. It is like the widening of spinal cord upwards. surfaces of Medulla oblongata. Anterior posterior.

kdora
Download Presentation

Medulla Oblongata (bulbus/medulla)

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. Medulla Oblongata (bulbus/medulla) Prof. Dr. Selda Önderoğlu

  2. Medulla Oblongata • The most inferior part of brain stem. • It is like the widening of spinal cord upwards.

  3. surfaces of Medulla oblongata • Anterior • posterior

  4. structures on the anterior surface(from midline laterally) -Ant. Median fissure -Pyramid -pyramidal Decussation -Anterolateral Sulcus exits:Hypoglossal N. -Olive -Retroolivary Sulcus Exits: Glossophryngeal N. vagus N. accessory N.

  5. Posterolateral surface of Medulla oblongata • glossopharyngeal N. • Vagus N. • Accessory N. • inferior cerebellar Peduncle

  6. Inferior Cerebellar Peduncleconnects medulla to cerebellum Contains fibers of: • post. Spinocerebellar Tract • Some fibers of ant. Spinocerebellar tr. • cuneocerebellar tr. • Olivocerebellari tr. • vestibulocerebellar tr. • fibers from cerebellum to vestibular&reticular nuclei

  7. Posterior surface of Medulla Oblangata is the lower triangle of rhomboid fossa

  8. Rhomboid Fossa • Is the space bw. Medulla+pons&cerebellum. • Filled with cerebrospinal fluid • Lower triangle is related to: medulla oblongata • Upper triangle to: pons

  9. inferior part of post. Surface of Medulla Oblongata-from midline laterally has • posterior median Sulcus • Fasciculus gracilis • Tuberculum gracilis(medial) • Tuberculum cuneatus (lateral) • Fasciculus cuneatus

  10. Superior part of post. Surface of Medulla oblangata( Rhomboid fossa’s lower triangle) From midline laterally has: • post. median sulcus • Medial Eminence • Sulcus limitans • vestibular Area • Stria medullaris

  11. Vestibular Nuclei • 4 vestibular nuclei 1- superior 2- inferior 3-medial 4-lateral Medial&inferior are at bulbus level

  12. Cranial nerves emerging from medulla oblongata • Last 4 cranial nn. • glossopharyngeal n. (9) • Vagus n. (10) • Accessory n. (11) • Hypoglossal n. (12)

  13. Cranial nerve Nuclei in brainstem

  14. Nuc. ambiguus • It is the The motor nucleus of • glossopharyngeal n. • Vagus n. • Cranial part of accessory nerve the nuclei of those 3 nn. Unite and form the nucl. Ambiguus

  15. Spinal tract and nucleus of Trigeminal nerve • Related to pain and temperature sensation carried from head and neck regions. • Located at pons, medulla and upper 1-2 segments of spinal cord. • At medulla level it is located posterolaterally • Nuc. spinalis nervi trigemini bu tractus’un medialinde bulunur.

  16. Solitary Tract Nucleus

  17. Dorsal Nucleus of Vagus Nerve

  18. Inferior Salivatory Nucleus

  19. Brain stem (Cranial nerves) • Bulbus

  20. Reticular Nuclei at medulla level • Nuc. reticularis lateralis • Nuc. reticularis ventralis • Nuc. reticularis gigantocellularis • Nuc. reticularis parvocellullaris • Nuc. reticularis paramedianus • Nuclei raphes • Nn. raphes obscurus • N. raphes pallidus • N. raphes magnus

  21. Internal structure of Medulla Oblongata(transverse section at lower levels) Pyramidal Decussation Fasciculus gracilis Fasciculus cuneatus

  22. Transverse section at the level of pyramidal decussation • Nuc. cuneatus • Nuc. Gracilis • Spinal tract& nucleus of trigeminal nerve

  23. Transverse section through the inferior level of olive • Cuneate nucleus • Accessorius cuneate nucleus • Nucleus gracilis • Spinal tract& nucleus of trigeminal nerve • lateral reticular Nucleus

  24. Transv.Section through the level of inferior olivary complex principal olivary nuc. Nuc.olivarius accessorius posterior Nuc. olivarius accessorius med. accessory cuneate Nuc.

  25. Transv.Section through upper levels of medulla • Medial vestibular nuc. • ınf. vestibular nuc. • Gigantocellullar reticular nuc. • Dorsal cochlear nuc. • inferior olivary nuc. • Pyramis • Vagus nerve

  26. Transv. Section at teh junction of medulla and Pons • 4th Ventricle • Cerebellar nuclei • inf. cerebellar Peduncle • Ventral& dorsal cochlear Nuc. • medial Lemniscus • Arcuate Nuc.

More Related