organization of the nervous system lesson 4. the central nervous system n cns l brain l spinal cord...
TRANSCRIPT
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
In reference to brainstem & spinal cord
Ventral Dorsal
Rostral
Caudal
Anterior Posterior
Superior
Inferior
Terminology
Medial - toward the midline Lateral - away from the midline Ipsilateral - same side Contralateral - opposite side Decussate - crossover ~
Coronal or frontal cross-section - salami
Sagittal - side view hot-dog bun
Horizontal top view ~
Planes
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 ~
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 ~