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Med Neuro Lect6
Med Neuro Lect6 Cerebral Anatomy - Brainstem
Question | Answer |
---|---|
What is Housed in the posterior cranial fossa? Can increased pressure here be detrimental? | 1.Cerebellum. 2.Brainstem. **Yes, Inc pressure can be lethal. |
What marks the attachment of the tentorium Cerebelli to the occipital bone? | Transverse Sinus |
What structures are seen from a posterior view just superior to the arches of C1? | Vertebral Arteries. |
What happens the inner and outer dural layers as they exit the foramen magnum? | INNER: continues down to attach at S2 (spinal column dura is only one layer). OUTER: Becomes the periosteum on the outer table of calvarium. |
Are C1 rootlets/Dorsal root ganglia visible posteriorly? | NO, just inferior to the vertebral A will be the C2 rootlets/Dorsal root ganglia. |
What sinus is found at the junction b/w the Falx cerebri and the tentorium cerebelli? | Straight Sinus |
What is the Incisor of the tentorium? | The hole/Arch in the tentorium cerebelli through which the brainstem ascends through. **Can damage the brainstem. |
Where do CN VII & VIII exit the cranium? | Internal Auditory Meatus. |
Where do CN IX, X, XI exit the cranium? what else empties there? | Jugular Fossa. **The Sigmoid sinus empties there into the jugular vein. |
Bulbar Palsy referes to damage to what? | Medulla |
What is the only motor nerve that exits dorsally to the denticulate ligament? | CN XI Spinal Accessory N. |
List the 3 main structures of the Brainstem in descending order | 1.Midbrain. 2.Pons. 3.Medulla (Bulb). |
What is the Cerebral Peduncle? what is called after it extis the pons (Anterior to the Medulla)? | (Also called the Crus Cerebri) is a big fiber tract from the cerebrum down to the spinal cord. **Called the Pyramidal or Corticospinal tract as it exits the pons anterior to the medulla. |
What is Pyramidal Decasation? | Occurs in the pyramidal/coritcospinal tract where fibers from the R cerebrum cross into the L and vica versa. |
What Medullary structure is located just posterior to the Pyramidal/corticospinal tract? | Inferior Olive. |
What structure is located in the gap b/w the thalamic hemispheres? What gland is at the base of this structure? | 3rd Ventricle. Pineal gland is a the base of it, b/w the two Superior caLiculus of the midbrain. |
Midbrain: Superior and Inferior Caliculus control what? | SUPERIOR: Vision system. INFERIOR: Auditory system. These are located just posterior to the Cerebral Peduncle. |
What is the only CN to come off the brainstem dorsally? | CN IV (originates just inferior to the Inferior Caliculus). |
List the Peduncles associated with the Cerebellum and their connected structures | 1.Superior Cerebellar (Midbrain). 2.Middle Cerebellar (Pons, largest of the 3 peduncles, gives cerebellum its curve shape). 3.Inferior Cerebellar (Medulla). |
What is the Obex? | tip of the 4th ventricle where the 2 Inferior cerebral peduncles join. **Surgical landmark. |
What 2 turbercles on the posterior Medulla represent major nuclei of the somatic sensory system? | 1.Cuneate Tubercle. 2.Gracile Tubercle |
What is the Tagmentum? | The body of the brain stem which runs from midbrain down to medulla. Controls: 1.Reproducion. 2.CV rate. 3.Respiratory system. **Also called Reticular Formation. |
Where does CN XII originate from? | B/w the medullary pyramidal (corticospinal) tract and the olivary tubercle. |
What does the Primary Fissure divide? What are their functions? | 1.Anterior Cerebellar Lobe: Legs & Feet. 2.Posterior Cerebellar Lobes: Hands, arms, and head. |
What structure is located b/w the anterior and posterior cerebellar lobes? What is the end of it called? | Vermus. **The edge of it is called the Uvula. |
What structure does the Tonsil represent? | The base of the cerebellum. Found on either side of the vermus Uvula. |
What connects the Cerebellar Folia in the Arbor Vitae to the peduncles (sup, mid, inf) | Myelin bands. **allows for communication. |
Flocularnodular Lobe | The oldest part of the cerebellum. Controls the vesitbular system and eye movements. **Nodulus becomes the floculus as it moves laterally from the 4th ventricle just above the uvula). |
What will result from damage to the the Flocularnodular lobe? | Vertigo, nstagnis, nausea, vomitting. **Damage could occur from small brainstem infarcts or vascular events. |
What 2 things could cause compression of the cerebellar tonsils onto the foramen magnum that could be lethal? | 1.Tumors/masses in the posterior cranial fossa. 2.Doing a lumbar puncture on a patient with Inc intracranial pressure |