organization of the nervous system
DESCRIPTION
Organization of the Nervous System . Lesson 4. The Central Nervous System. CNS Brain Spinal cord ~. Peripheral Nervous System. Somatic Nervous System - SNS Sensory Division Motor Division Autonomic Nervous System - ANS Sympathetic Division Parasympathetic Division Homeostasis ~. - PowerPoint PPT PresentationTRANSCRIPT
Organization of the
Nervous System Lesson 4
The Central Nervous System
CNS Brain Spinal cord ~
Peripheral Nervous System
Somatic Nervous System - SNS Sensory Division Motor Division
Autonomic Nervous System - ANS Sympathetic Division Parasympathetic Division Homeostasis ~
Divisions of the Brain Different schemes 5 major subdivisions
Telencephalon Diencephalon Mesencephalon Metencephalon Myelencephalon ~
Forebrain cortex sub-cortical areas
Midbrain tectum & tegmentum
Hindbrain cerebellum & pons medulla ~
Divisions of the Brain
Dorsal - toward the back Ventral - toward the stomach Anterior & Posterior Rostral & Caudal ~
Terminology
Dorsal
Ventral
In reference to the BRAIN
Anterior
Posterior
Rostral Caudal
Inferior
Superior
In reference to brainstem & spinal cord
Ventral Dorsal
Rostral
Caudal
Anterior Posterior
Superior
Inferior
Neural Axis
Terminology
Medial - toward the midline Lateral - away from the midline Ipsilateral - same side Contralateral - opposite side Decussate - crossover ~
Medial:toward themidline
Lateral:away frommidline
Ipsilateral same side mid-line
Contralateral opposite side of mid-line
This tract of fibers decussates.
It crosses the midline
Terminology Afferent - toward Efferent - away from ~
Afferent
Efferent
Coronal or frontal cross-section - salami
Sagittal - side view hot-dog bun
Horizontal top view ~
Planes
Coronal Section
Horizontal Section
View from top
Mid-sagittal Section
Side view
Forebrain
Cortical areas Fiber systems Landmarks
Fissures /Sulci Gyri Lobes ~
Superior surface
Longitudinal Fissure (sulcus)
Central sulcus
Lateral sulcus
Major Lobes
Major Lobes & Primary Function
Frontal planning motor control emotion
Parietal somatosensory maps of body & space
Temporal auditory memory
Occipital vision ~
The Meninges
Tough connective tissue Dura mater - tough outer layer Arachnoid membrane - soft middle
layer Pia mater - soft inner layer, next to
brain ~
Subarachnoid space
Gap between arachnoid membrane and pia mater
Filled with Cerebrospinal Fluid (CSF) Brain floats in CSF ~
Dura materArachnoid membrane
Subarachnoid space CSF
Pia mater
Brain
The Meninges
Ventricular System
*Continuous with subarachnoid space 4 interconnected ventricles chambers Cerebrospinal Fluid (CSF) manufactured in choroid plexus 125 ml, t1/2 = 3 hrs *Buoyancy: 1400 g 50 g Hydrocephalus blockage of CSF flow ~
Ventricular System
L V L V
3rd
Lateral Ventricles
Third Ventricle
Fourth Ventricle
Cerebral Aqueduct
Central Canal
4th