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3. Internal and external features of the Medulla.pdf -...

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Internal and externalfeatures of the MedullaRichard M. BlayAnatomy DepartmentUGSBAHS
ObjectivesTo describe the external features of the medullaDescribe the internal features and organisationDescribe cranial nerve nuclei and tracts at the variouslevelsTo be able to locate lesions by assessing the signs andsymptoms
Diagram depicting the main subdivisions of the embryonic vertebratebrain. These regions will later differentiate into forebrain, midbrain andhindbrain structures.
FOREBRAIN: subdivides into:1-Two cerebral hemispheres (cavities: 2 lateral ventricles).2-Diencephalon(cavity: 3rdventricle) :thalamus, hypothalamus, epithalamus & subthalamusMIDBRAIN(cavity: cerebral aqueduct).HINDBRAIN(cavity: 4thventricle): subdivides into1-Pons.2-Cerebellum.3- Medulla oblongata.Development Of the BrainThe brain develops from the cranial part of neural tube.The cranial part divides into 3 parts:
Brain StemMidbrainPonsMedulla
Ventral surface of the Brain
Sagittal Section of the Brain
Functions of brain stem1.Pathway of tracts between cerebral cortex & spinal cord.2.Site of origin of nuclei of cranial nerves (from 3rdto 12th).3.Contains groups of nuclei & related fibers known asreticular formation responsible for:control of level ofconsciousness, perception of pain, regulation ofcardiovascular & respiratory systems.

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Term
Fall
Professor
NoProfessor
Tags
Neuroanatomy, Medulla oblongata, Inferior olivary nucleus

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