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BRAIN STEMDr P.S. Deb MD, DM Director NeurologyGNRC Hospitals Guwahati, Assam, India
Brainstem
Developmen
tal
Mesencepha
lon
Midbrain
Rhombence
phalon
Pons Medulla
Anatomical
(Ant-Post)
Basal Temgentum Tectum
Physiologica
l
White
matter
Descending Ascending
Gray matter
Cranial nerves
Other nuclei
DEVELOPMENT DIVISION OF NERVOUS SYSTEM
Four stages in early development of brain and cranial nerves (times are approximate). A: 31/2 weeks. B: 41/2 weeks. C: 7 weeks. D: 11 weeks
BRAIN STEM DEVELOPMENT Schematic
illustration of the widening of the central cavity in the lower brain stem during development.
BRAIN STEM ANATOMY Gross anatomy of brainstem and it's division
Anterior Posterior Lateral
Medulla at Olivary nucleus Sensory decussation Pyramidal decussation
Pons Rostral pons Caudal pons
Midbrain at Superior Colliculus Inferior Colliculus
BRAIN STEM STRUCTURE
SUPERFICIAL AND DEEP DISSECTION
BRAIN STEM LATERAL VIEW
BRAINSTEM DISSECTION
CEREBELLAR AFFRENT
CEREBELLAR EFFRENT
SOMESTHETIC SYSTEM
TRIGEMINAL SYSTEM
AUDITORY SYSTEM
VESTIBULAR SYSTEM
TASTE SYSTEM
MIDBRAIN LEVELS
MIDBRAIN AT INFERIOR COLLICULUS LEVEL
PONS
UPPER PONS
MIDDLE PONS
LOWER PONS
MEDULLA
BRAIN STEM NUCLEI
CRANIAL NERVE NUCLEI
MOTOR AND SENSORY NERVES
FACIAL NERVE NUCLEI AND FASCICLE
NUCLEUS OF SOLITARY TACT
TRIGEMINAL NUCLEAR CONNECTION
DORSAL NUCLEUS OF THE VAGUS
PrecerebellarNuclei 1. Red Nucleus 2. Vestibular Nucleus
3. Inferior Olivary Nucleus
4. Perhypoglossal Nuclei
5. Accessory Cuneate Nucleus
VESTIBULOSPINAL TRACT
CROSS SECTIONS OF THE BRAINSTEM – MAIN RETICULAR NUCLEI
POSITION OF THE RETICULAR FORMATION IN THE BRAINSTEM
THE CONNECTIONS OF THE LATERAL SPINOTHALAMIC TRACT, INCLUDING THOSE MADE WITH THE RETICULAR FORMATION
CORTICORETICULAR PROJECTIONS
ASCENDING AND DESCENDING AXONS IN RETICULAR FORMATION
THANK YOU