Brainstem And Cranial Nerves Flashcards
Use of brainstem
All ascending and descending pathways pass through the brainstem
Many pathways synapse or relay there
Which cranial nerve nuclei are found
III-XII excluding XI
How is the cerebellum connected to the brainstem
By 3 cerebellar peduncles also known as white fibre tracts
What descending tracts go through the cerebral peduncles?
Corticospinal and corticobulbar tracts taking voluntary info from motor cortex down to lower motor neurones of brain stem or spinal cord
What nerves are found in midbrain
III-IV oculi motor and trochlear
What cranial nerves emerge at pons
V,VI,VII AND VIII
trigeminal,abducens,facial and vestibulocochlear
What else can be found in pons
Pontine nuclei,transverse fibres and descending pathways
What nerves emerge at the open upper medulla
IX,X,XII
Glossopharyngeal, vagus and hypoglossal nerve
Called open as the 4th ventricle has no roof
What cranial nerves emerge at the lower medulla
IX,X,XII
SAME AS UPPER
Which vessels is the anterior supply derived from
Internal carotid system
Supplied to cerebral hemispheres
Which vessels is posterior supply derived from
Vertebrobassilar system
Supplies brainstem
What are general somatic (body) afferent nerves?
Fibres that carry general sensation from skin, muscles, joints of head and neck
What are general somatic efferent nerves?
Fibres that innervate skeletal muscle
What are general visceral afferent nerves
Fibres that carry sensation from viscera of head, neck, thorax and abdomen
- What are general visceral efferent nerves?
Fibres that are the preganglionic parasympathetic neurones to cranial, thoracic and abdominal viscera
