Brain-11 - Chapter 11 Gross Anatomy of the Brain and...

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Chapter 11 Gross Anatomy of the Brain and Cranial Nerves 1
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The Nervous System can be divided in: l Central Nervous System (CNS) ¡ Brain and Spinal Cord l Peripheral Nervous System (PNS) ¡ Cranial and spinal nerves, ganglia, sensory receptors 2
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Division of the Peripheral Nervous System l Sensory or afferent ¡ Somatic ¡ Visceral l Motor or efferent ¡ Somatic - voluntary ¡ Visceral or Autonomic Nervous System (ANS) - involuntary l Sympathetic l Parasympathetic 3
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l Six regions in the adult brain ¡ Cerebrum ¡ Diencephalon ¡ Mesencephalon ¡ Pons ¡ Cerebellum ¡ Medulla oblongata l Brain contains extensive areas of neural cortex ¡ Layer of gray matter on the surface of the cerebellum and cerebrum Major regions and landmarks 4
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l Brain forms from three swellings at the tip of the developing neural tube ¡ Prosencephalon l Forms the cerebrum and diencephalon ¡ Mesencephalon ¡ Rhombencephalon l Forms cerebellum, pons and medulla oblongata Embryology of the brain 5
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The Cerebrum 6
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l Surface contains gyri , sulci , fissures l Fissures ¡ Longitudinal fissure separates two cerebral hemispheres ¡ Transverse fissure separates cerebellum from cerebrum The cerebral hemispheres 7
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The Cerebrum 8
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The cerebral hemispheres l Sulci ¡ Parieto-occipital sulcus separates parietal from occipital lobe ¡ Lateral sulcus separates temporal from parietal lobe ¡ Central sulcus separates frontal and parietal lobe 9
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The cerebral hemispheres l Gyri ¡ Precentral gyrus ¡ Poscentral gyrus 10
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l Frontal ¡ Precentral gyrus l Primary motor area – conscious control of voluntary movements. ¡ Premotor cortex – memory bank for skilled motor activities or of patterned and repetitious nature. ¡ Broca’s area l Located on the left hemisphere. Motor area that control the muscles involved in speech. 11
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Brain-11 - Chapter 11 Gross Anatomy of the Brain and...

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