Midbrain


Midbrain audio                 More

 

The midbrain is dwarfed by other structures in the neuraxis. It contains the following parts-

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Ventral crus cerebri which carries the pyramidal tract from the forebrain.

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 Dorsal to the crus cerebri is the midbrain tegmentum. The most dorsal part of the midbrain is the tectum. This is called tectum opticum in lower animals, especially the reptiles to emphasize the role in visual reflexes. In man it contains or mediates both visual and auditory reflexes. It also contains two structures  
 
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Superior colliculus

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Inferior colliculus

 

The midbrain tegmentum also contains the nuclei of two important cranial nerves. They are

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Oculomotor nuclear complex

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Accessory oculomotor nuclei

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Trochlear nerves

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Pretectal area
 

Other important nuclear groups are
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Red nuleus

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Substantia nigra

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Pretectal nuclei

Crus cerebri passes through the midbrain in its journey to the basis pontis. Cerebral aqueduct is the cavity of the midbrain.

 

The level of the superior colliculus is the same level of the oculomotor nucleus while the level of the trochlear nerve has the inferior colliculus. The trochlear nerve is the only cranial nerve that issues from the dorsal aspect of the brain. It then passes around the lateral aspect of the brainstem in  order to appear in the ventral aspect of the brain and enter the cavernous sinus.

 

Links

Midbrain

   Crus cerebri

   Midbrain tectum

      Superior colliculus

      Inferior colliculus

   Midbrain tegmentum

      Midbrain reticular formation

      Substantia nigra

      Red nucleus

 

 

Practical (Pal-Weigert)

 

 


Brain short movie

 

 

Electronic School of Medicine
Creator: Oluwole Ogunranti
 

 

 

 
Midbrain in Scene 5 DIGITAL LOCATOR OF MIDBRAIN: Scene 1-Brain -inferior surface. Scene 2 Expand brainstem. Scene 3, Brain -medial view -midsagittal section. Scene 4 Remove midbrain. Scene 5 Lateral view of brainstem. Rollover mouse to label and click to display page, Click blinking end page to display rmidbrain page.


Axial MRI showing midbrain

 
Brainstem Medulla Pons Midbrain Thalamus Epithalamus
Basal ganglia Forebrain Temporal lobe Cerebral operculum Remove operculum Wall of lateral ventricle 1
Wall of lateral ventricle 2 Wall of lateral ventricle 3 lateral ventricle 1 lateral ventricle 2 Base of brain Rhomboid fossa

 

 

 

 

 

 

 

 

 

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