神经解剖学英文课件-脑干英文课件

Dorsal surfaces of the pons and medulla
• facial colliculus lies in the medial eminence just superior to stria medullaris.
• abducens nucleus lie beneath the facial colliculus. • hypoglossal triangle lie within the medial eminence just inferior to stria
Ventral view of midbrain
• Massive crural cerebri • interpeduncular fossa • oculomotor nerve
emerging between the crura cerebri. • Floor of the fossa is called posterior perforated substance due to the many blood vessels perforate the midbrain.
• There is sulcus in the ventral surface of pons which is called basilar sulcus in which the basilar artery lies.
The ventral surface of pons
The ventral surface of the pons
➢Ventral view ➢Dorsal view
Midbrain Pons Medulla oblongata
Ventral aspect of medulla
• Hypoglossal nerve • Postolivary sulcus • Glossopharyngeal
nerve • Vagus nerve • Accessory nerve
medullaris. • dorsa vagus motor nucleus lie beneath vagus motor dorsal triangle.
The dorsal surface of the medulla consists of
• gracilis tubercle The nuclei gracilis lie beneath it. It is relay nuclei of the fasciculis gracilis .
•Anterior median fissure •Pyramid •Decussation of pyramid •Olive •Preolivary sulcus
The ventral surface of pons
• It is convex and is continuous laterally with the cerebellum by large paired middle cerebellum peduncle
Brain Stem
• External structure: superficial markers • Internal structure: grey matter, white matter, reticular formation • Important section levels
External structures
Dorsal surfaces of the pons and medulla
stria medullaris sulcus limitans medial eminence vestibular area: vestibular
nuclei lie beneath the vestibular area.
• The ventral surface of pons is closely associቤተ መጻሕፍቲ ባይዱted with four cranial nerves Ⅴ,Ⅵ,Ⅶ,Ⅷ.
• The trigeminal nerve Ⅴ, is located between the pons and middle cerebelum peduncle. It consists of a large sensory root and small motor root.
Dorsal surfaces of the pons and medulla
rhomboid-shaped fossa
✓ Boundary ✓ Lateral recess/aperture ✓ Median sulcus ✓ Aqueduct
lateral apertures
median aperture
• The Ⅵ( abducens N ),Ⅶ (facial N),Ⅷ ( vestibolocochlear N) exit the sulcus between the pons and medulla from the medial to lateral.
• The Ⅶ (facial N) consists of a large motor root & a small sensory root is called intermediate N.
• cuneate tubercle The nuclei cuneatus lie beneath it. It is relay nuclei of the fasciculis cuneatus
dorsa surface of mid brain
• superior and inferior colliculi/Quadrigemina corpora • tectum of the midbrain • Cranial nerve Ⅳ