3. PARTS
•brainstem (brain stem) is the distal part of
the brain that is made up of the
•midbrain,
•pons, and
•medulla oblongata.
4. Functions of brain stem
•they help to regulate breathing, heart rate,
blood pressure, and several other important
functions.
•brainstem houses cranial nerve nuclei and is a
passageway for many important neural pathways.
5. • There are three parts of the brainstem:
• the medulla oblongata is the narrowest and most distal part
• the pons lies anteriorly and in the middle segment of the brainstem
• and the midbrain is the widest and most superior segment.
30. BASILAR PART
• Basilar part consists of the longitudinal bundles of fibres, the
transverse fibres and the pontine nuclei:
• Longitudinal bundles of fibres contain corticopontine, corticonuclear
and corticospinal fibres.
• The corticopontine fibres relay in the ipsilateral pontine nuclei.
• The corticonuclear fibres terminate in the contralateral (and to some
degree ipsilateral) motor nuclei of the cranial nerves.
31. TEGMENTAL PART
• Tegmental part is traversed by a number of ascending and descending
tracts and includes a decussation of transversely running fibres, the
trapezoid body.
• also includes the nuclei of trigeminal (5th), abducent (6th), facial (7th)
and vestibulocochlear (8th) nerves
