2. • 1.Metencephalon(from pontine flexure to
rhombencephalic isthmus)
• 2.Myelencephalon(R.I to cervical flexure)

3. • Forms medulla oblongata
• DIFFERENCE FROM SPINAL CORD:
• 1.lateral walls are everted
• 2.Roof plate:single layer of ependymal cells covered by
vascular mesenchyme called Pia Mater..Together these
constitute Tela Choroidea

4. • 3 motor nuclei
• Medial to Lateral
• Somatic efferent..Sp.visceral efferent..General Visceral
efferent

5. • Extent: up to mesencephalon…called som.efferent motor
column
• Hypoglossal nerve nucleus supplying muscles of tongue

6. • Extent: up to Metencephalon
• CN IX,X,XI

7. • Muscles of
• GIT
• Respiratory tract

8. • Med to lateral
• Som.aff
• Sp.visceral aff
• Gen.visceral aff

9. • Receives impulses from head(CN V)and ear(CN VIII)

10. • Oral cavity(tongue,palate,oropharynx,epiglottis)

11. • Impulses from GIT and Heart

12. • Tela choroidea in the roof of myelencephalon invaginates
into the underlying cavity in the form of tufts forming
choroid plexus