W20-L2: An Overview of the Brainstem Flashcards Preview

Matt's Block 06 - Neuro block > W20-L2: An Overview of the Brainstem > Flashcards

Flashcards in W20-L2: An Overview of the Brainstem Deck (17):

What is wrong with Anencephalic babies?

Born without a forebrain


Role of the brainstem

-Reflexive and unconscious behaviour.
-Modulation of various arousal and conscious states
-Provides survival centres


What are important structures of the brainstem?

1. Cranial nerve nuclei and related structures
2. Reticular formation and related structures.
3. Long fibre tracts
4. Cerebellar circuitry


What is the tegmentum?

Structure in the brainstem which is continuous with the spinal cord


What makes up the tectum?

Superior and Inferior Colliculi (only at level of midbrain)


What is the rule of 4?

4 cranial nerves exit at the medulla IX-XII, 4 exit the pons, V, VI, VII, VIII and 4 above the pons I-IV


From which plate is sensory and motor nuclei developed?

Sensory nuclei develop from the Alar plate
Motor nuclei develop from the basal plate.


Where are motor and sensory nuclei positioned?

Motor nuclei are closer to midline.
Sensory nuclei positioned laterally.


How are nuclei within the brainstem located?

Medial 3 columns are motor, lateral 3 are sensory columns


Where is the reticular formation found?

Found at every level and is continuous both rostrally and caudally


What is the caudal reticular formation refexes?

Reflexes with crucial functions in motor reflex and autonomic functions like spinal cord eg Ventrolateral medullary reticular formation which regulates GI via vagus


What are the three major pathways that pass through the brainstem?

Dorsal column-medial lemniscus system, anterolateral system and corticospinal tract


Where does the corticospinal tract occupy in the brainstem?

The ventral aspect top to bottom


What does the dorsal aspect of the brainstem have?

Cranial nerve nuclei Reticular formation


Ventral aspect of the midbrain is made up of what?

cerebral peduncles, substantia nigra, red nuclei (along with corticospinal tract)


Ventral aspect of the Pons is made up of what?

Cerebellar nuclei,middle cerebellar peduncle (along with corticospinal tract)


Ventral aspect of the medulla is made up of what?

inferior olivary nuclei (along with corticospinal tract)

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