320 Cerebrum - Anatomy & Physiology The Central Nervous...

Info iconThis preview shows pages 1–16. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 12 Part 1 The Central Nervous System
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Brain Development Brain Development Posteriolateral growth of the cerebral hemispheres encloses the diencephalon and superior aspect of the brain stem
Background image of page 2
Embryo at four weeks http://w-cpc.org/fetal1.html
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Embryonic Development Embryonic Development Ectoderm thickens along dorsal midline to form the neural plate The neural plate invaginates, forming a neural groove flanked by neural folds The neural groove fuses dorsally and forms the neural tube which detaches from the surface ectoderm. The neural tube differentiates into the CNS. Neural crest cells form some PNS structures.
Background image of page 4
Embryonic Development Embryonic Development
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Neural Tube and Primary Brain Vesicles Neural Tube and Primary Brain Vesicles The anterior (rostral) end of the neural tube expands and forms the three primary brain vesicles Prosencephalon Mesencephalon Rhombencephalon
Background image of page 6
Secondary Brain Vesicles Secondary Brain Vesicles In week 5 of embryonic development, secondary brain vesicles form Telencephalon and Diencephalon arise from the prosenencephalon Mesencephalon remains undivided Metencephalon and Myelencephalon arise from the rhombencephalon
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Adult Brain Structures Adult Brain Structures Secondary brain vesicles differentiate into adult brain structures Telencephalon – cerebrum: cortex, white matter, and basal nuclei Diencephalon – thalamus, hypothalamus Mesencephalon – brain stem: midbrain Metencephalon – brain stem: pons Myelencephalon – brain stem: medulla oblongata
Background image of page 8
Adult Brain Structures Adult Brain Structures
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Adult Neural Canal Regions Adult Neural Canal Regions The central cavity of the neural tube enlarges in four regions to form fluid-filled Ventricles Telencephalon – Lateral Ventricles Diencephalon – Third Ventricle Mesencephalon – Cerebral Aqueduct Spinal Cord – Central Canal
Background image of page 10
Adult Neural Canal Regions Adult Neural Canal Regions
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Ventricles of the Brain Ventricles of the Brain Pair of C-shaped Lateral Ventricles Third Ventricle in the diencephalon Fourth Ventricle in the hindbrain dorsal to the pons
Background image of page 12
Cerebral Hemispheres Cerebral Hemispheres Form the superior part of the brain and make up over 80% of its mass Hemispheres are separated by the Longitudinal fissure and from cerebellum by the Transverse Cerebral fissure Surface Features: Ridges called Gyri (gyrus) Shallow grooves called Sulci (sulcus) Deeper grooves called Fissures
Background image of page 13

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Cerebral Hemispheres - Lobes Cerebral Hemispheres - Lobes Frontal, Parietal, Temporal, Occipital, and (Insula) Central sulcus – separates the frontal and parietal lobes Parieto-occipital sulcus – separates the parietal and occipital lobes Lateral sulcus – separates the parietal and temporal lobes
Background image of page 14
Cerebral Hemispheres – 3 basic regions Cerebral Hemispheres – 3 basic regions Cortex – superficial gray matter, 1-4.5 mm thick White matter – inner, unmyelinated Basal Nuclei – islands of gray matter within the white matter
Background image of page 15

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 16
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 55

320 Cerebrum - Anatomy & Physiology The Central Nervous...

This preview shows document pages 1 - 16. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online