Midbrain Flashcards
Where is midbrain?
What does midbrain divide into?
Tectum and cerebral peduncles
What structure in tectum?
What nerve?
Colliculi
2 superior 2 inferior
Trochlear inferior to colliculi
What nerve present in cerebral peduncles?
What tract?
Occulomotor
Optic tract
What nerve present in cerebral peduncles?
What tract?
Occulomotor
Optic tract
Where is tegmentum?
Posterior inferior colliculus
What 3 structures form brainstem?
Midbrain
Pons
Medulla
Where is tegmentum and tectum?
Midbrain
What is in tegmentum? (3)
Fibre tracts
3 regions
Red nucleus
Periaqueductal gray
Substantia nigra
What do midbrain, pons and medulla form?
Brainstem
What is the brainstem?
Midbrain (top)
Pons
Medulla (bottom)
What is the brainstem?
Midbrain (top)
Pons
Medulla (bottom)
What is cavernous sinus part of?
Basal ganglia
What is dopaminergic center of brain?
Pars compacta
Cavernous sinus
Function of pars compacta?
Dopaminergic
Crucial facilitating movement
Where do most dopaminergic neurons project?
Striatum (caudate putamen)
Facilitate movement
What causes Parkinsons? Symptoms?
Loss dopaminergic neurons in substantia nigra pars compacta
Slow movement
Rigidity
Tremors
What does pars reticulata contain?
GABA neurons
