Brain stem 1- Medulla oblongata 2- Pons 3- Mid brain

Bulb of the brain

borders Medullopontine sulcus c1

Height and wide 3 cm 2 cm

Medulla division ` Lower closed part upper open part

External surface Fissure, sulcus, tubercle

Fissure, sulcus,

Ant. Region Lat. Region Post. Region

Causes of tubercles  1- pyramid  2- olive  3- gracilis  4- cuneatus  5- terigeminal

Spinomedullary junction 1- Separation of ant horn 2- Diverge of posterior horn, and appearance of three nuclei 3- Appearance of Forth ventricle

Nuclei of spinomedullary junction 1- spinal nucleus of accessory nerve 2- supraspinal nucleus 3- gracilis nucleus 4- cuneatus nucleus 5- spinal nucleus of trigeminal nerve

Nuclei in the closed and open parts of medulla oblongata 1- somatosensory nuclei 1- somatosensory nuclei 2- rely nuclei to the cerebellum 2- rely nuclei to the cerebellum 3- nuclei of cranial nerves 3- nuclei of cranial nerves

1- somatosensory nuclei 1- Gracilis nucleus 2- Cuneatus nucleus 3- Spinal nucleus of trigeminal nerve 4- Nucleus z

2- rely nuclei to the cerebellum 1- inferior oilvary complex nuclei 2- accessory cuneatus (lat/ext cuneatus)or Monakow 3-arcuate nucleus

1- inferior oilvary complex nuclei

3-arcuate nucleus

3- nuclei of cranial nerves 1-Hypoglossal nucleus 2-Dorsal nucleus of vagus 3-Ambigus nucleus 4-Vestibular nuclei 5-Coclear nuclei (dorsal and ventral) 6-Solitary nucleus

1-Hypoglossal nucleus

2-Dorsal nucleus of vagus

3-Ambigus nucleus

Ambigus nucleus

4-Vestibular nuclei

5-Coclear nuclei (dorsal and ventral)

Solitary nucleus

Non- Gustatory

Inferior salivatory nucleus

Glossopharyngeal nerve