Class notes anatomy

Anatomy of the Brain Stem Color Code
Important
(External Features) Doctors Notes
Notes/Extra explana
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,Objectives
At the end of the lecture, students should:
✓ List the components of brain stem.
✓ Describe the site of brain stem.
✓ Describe the relations between components of brain stem & their
relations to cerebellum.
✓ Describe the external features of both ventral & dorsal surfaces o
brain stem.
✓ List cranial nerves emerging from brain stem.
✓ Describe the site of emergence of each cranial nerve.

, Development of the Brain
o The brain develops from the cranial part of *recall from embryology the caudal 2/3 for
neural tube*. cord and the cranial or upper 1/3 forms th

o The cranial part is divided into 3 parts:
FOREBRAIN MIDBRAIN HINDBRAIN
Cavity




2 lateral 3rd ventricle cerebral 4th ventricle
ventricles aqueduct
Two cerebral Diencephalon: The midbrain is 1- Pons.
Subdivided into




also called
hemispheres 1. thalamus, mesencephalon
2- Cerebellum.
2. hypothalamus, 3- Medulla
3. epithalamus & oblongata.
4. subthalamus


Note: the brain stem develops from 2 different parts. The
pons and medulla oblongata develop from the hindbrain
where as the midbrain develops from the midbrain.