Human Nervous System
Page 1: Human Nervous System
Page 2: Co-ordinating Systems
Definition: Systems that facilitate communication between receptors and effectors in the body to produce correct responses to environmental changes (stimuli).
Importance for Survival: All animals must respond to their environment to survive.
Types of Co-ordinating Systems in Humans:
Nervous Co-ordinating System
Endocrine Co-ordinating System
Functionality: Both systems work together to respond to environmental changes and maintain internal body conditions.
Page 3: Nervous Co-ordinating System
Speed: It responds the fastest through nerve impulses.
Page 4: Endocrine Co-ordinating System
Speed: Slower than the nervous system; operates through hormones carried in the bloodstream.
Page 5: Nervous System Overview
Control and Communication Center: The nervous system allows continuous flow of information between the environment, brain, and various body parts.
Functionality: Essential for effective body functioning and managing daily tasks.
Page 6: How Nervous System Functions
Sensory Function: Sensory receptors detect changes in both external and internal environments.
Integrative Function: Central nervous system (CNS) processes the information and determines responses needed.
Motor Function: Effectors (muscles and glands) execute appropriate responses.
Page 7: Example of Nervous System Functioning
Scenario: Riding a bike, noticing a red traffic light (sensory function), processing the information (integrative function leads to stopping the bike using brakes (motor function)).
Page 8: What are Stimuli?
Definition: Physical or chemical changes that provoke a response in organisms.
Examples: Light, temperature, sounds, atmospheric pressure, as well as internal conditions like blood pressure and pH.
Page 9: Human Nervous System Structure
Main Components:
Central Nervous System (CNS): Brain and spinal cord
Peripheral Nervous System (PNS): Nerves throughout the body.
Page 10: Central Nervous System Overview
Composition: Mass of interconnected neurons comprising the brain and spinal cord.
Functions: Processes sensory information, maintains organ functions, controls movements, thoughts, and feelings.
Page 11: CNS Protection
Protective Structures:
Meninges: Three connective tissue membranes
Cerebro-spinal Fluid: Cushions CNS against shocks, derived from blood plasma in the brain's ventricles.
Bony Cases: Cranium and vertebral column protect CNS.
Page 12: Cranium Protection
Structure: Dome-shaped with 8 curved skull bones joined by sutures to shield the brain from mechanical injuries.
Page 13: Protective Layers of CNS
Meninges Layers:
Pia Mater: Delicate inner layer
Arachnoid: Middle layer
Dura Mater: Tough outer layer
Page 14: Basic Protective Structures
Illustration: Skull, Dura Mater, Arachnoid, Pia Mater, and brain tissue.
Page 15: Vertebral Column Protection
Structure: Comprising 33 vertebrae that protect the spinal cord against mechanical injury, provides shock absorption through its curvature and inter-vertebral discs.
Page 16: Anatomy of the Lumbar Vertebrae
Details: Includes spinal disc structure and transverse processes.
Page 17: Cross-Section of CNS
Components: Skin, Dura Mater, Cranial Bone, Arachnoid, Pia Mater, nerve structures.
Page 18: Structure of the Brain
Composition: Enlarged upper part of spinal cord within cranial protection; divided into sections including cerebrum, brain stem, and cerebellum.
Page 19: External View of Human Brain
Components: gyrus, sulcus, cerebellum, cranial and spinal nerves.
Page 20: Internal Structure of the Brain
Key Areas: Thalamus, hypothalamus, pituitary gland, and various brain regions illustrated with a focus on white and grey matter.
Page 21: Cerebrum Overview
Functions: Controls voluntary and involuntary behaviors; composed of various lobes such as frontal, parietal, occipital, and temporal.
Page 22: Lobes of the Cerebrum
Division: Central sulcus, parietal lobe, occipital lobe, temporal lobe, and connections illustrated across cerebral regions.
Page 23: Additional Brain Structure
Components: Spinal cord, cerebellum, midbrain, etc.
Page 24: Cerebrum Components
Characteristics: Largest part, divided into hemispheres linked by corpus callosum; features gyri and sulci for increased surface area.
Page 25: Cerebrum Ventricles
Ventricles: Four cavities within brain filled with cerebro-spinal fluid; outer layer forms the cerebral cortex (grey matter) with underlying white matter.
Page 26: Surface Lobes of the Cerebrum
Illustration of lobes: Frontal, parietal, occipital, and temporal lobes highlighted.
Page 27: Cerebral Cortex
Definition: Outermost layer of grey matter that forms the cerebral surface.
Page 28: Grey Matter vs. White Matter
Definitions:
Grey Matter: Neuron cell bodies
White Matter: Myelinated fibers
Structures: Neurons may organize into nuclei and tracts.
Page 29: Brain Ventricles
Components: Lateral ventricles, third ventricle, fourth ventricle, and their pathways.
Page 30: Detailed Anatomy of the Brain
Labeling: Identifying key features, emphasizing cerebro-spinal fluid.
Page 31 to 33: Functions of Cerebral Lobes
Roles:
Frontal Lobe: Motor functions, reasoning, and personality control.
Parietal Lobe: Sensory perception and spatial orientation.
Occipital Lobe: Vision processing.
Temporal Lobe: Memory, language understanding, hearing.
Page 34: Brain's Lobes Overview
Details: Functions related to decision-making, sensory processing, language comprehension, and attention.
Page 35: Cerebrum Functions Overview
Areas: Motor area, sensory areas, and association cortex roles in integrating and processing information.
Page 36: Functional Areas of Cerebral Cortex
Details: Specific roles of motor, sensory, and association areas illustrated.
Page 37 to 40: Cerebellum Structure and Functions
Structure: Composed of two hemispheres with branches resembling a tree.
Functions: Coordination of muscle movements, posture maintenance, and balance stability.
Page 41: Summary of Cerebellum
Key Point: Position and composition emphasizing its role beneath the cerebrum.
Page 42-44: Hypothalamus Functionality
Position: Below thalamus, above pituitary gland; regulates critical homeostasis functions.
Functions: Influences autonomic system, emotional responses, and pituitary hormone control.
Page 45-46: Medulla Oblongata Overview
Role: Serves as communication pathway for impulses; regulates vital reflex actions like breathing and heartbeat.
Page 47: Brain Structure Classification
Components: Forebrain, midbrain, hindbrain categorization.
Page 48-50: Spinal Cord Structure and Functions
Composition: Elongated nervous tissue with structured grey and white matter; protected by meninges and surrounded by vertebral column.
Page 51-53: Detailed Anatomy and Functions
Gray Matter: Integration center for reflex actions; encasing structure aiding impulse pathways.
Page 54-56: Cross-Section of Spinal Cord
Details: Visual representation of spinal structure emphasizing function and organization.
Page 57: Peripheral Nervous System Overview
Definition: Consists of all nervous tissue outside CNS; links to receptors and effectors.
Components: 12 pairs of cranial nerves and 31 pairs of spinal nerves.
Page 58: Structure of Nervous System
Main Structures: Highlighting different nervous system components.
Page 59-60: Cranial and Spinal Nerves
Cranial Nerves: Connect to brain, function in sensory or motor capacities.
Spinal Nerves: Provide mixed sensory and motor neuron functions.
Page 61: Functions of PNS
Roles: Collecting and transmitting information, combining sensory and motor functions.
Page 62: Motor Division Composition
Divisions: Somatic and autonomic systems; controlling voluntary and involuntary movements, respectively.
Page 63-66: Autonomic Nervous System
Functionality: Maintains homeostasis, controlling involuntary activities via sympathetic and parasympathetic responses.
Page 67-70: Comparison of Autonomic Functions
Sympathetic vs. Parasympathetic: Effects on body organs during stress and rest, highlighting opposing reactions.
Page 71: Summary of Autonomic System Functions
Stimulatory vs. Inhibitory: Functions categorized based on responses to stress and relaxation.
Page 72: Composition of Nervous Tissue
Components: Neurons and supporting neuroglia cells.
Page 73-76: Neuron Structure and Types
Structure: Main components including dendrites and axons enabling impulse conduction.
Types: Sensory, connector, and motor neurons classified by functions.
Page 77: Neuron Functionality
Dendrites: Collect information to pass to the cell body.
Axons: Conduct impulses away from the cell body to effectors.
Page 78-81: Neuron Classifications
Detailed Description of sensory, connector, and motor neurons; emphasizing functions within the CNS.
Page 82: Neuron Types Summary
Visualization: Illustrates basic types of neurons and their distinctions.
Page 83-86: Motor Neuron Structure
Functional Features: Describes layout and component roles for optimal impulse conductivity.
Page 87: Notes on Neurons
Additional Notes: Key terminologies and features specific to the neuron structure and function.
Page 88-90: Nerve Structures
Composition: Description of nerves comprising numerous neuron fibers, their connection and organization.
Page 91: Nerve Functions
Roles: Key functions in transmitting impulses between CNS and body effectors.
Page 92-96: Synapses and Reflex Arcs
Details on Synapses: Mechanism of impulse transfer across synaptic clefts, including neurotransmitter roles.
Reflex Arcs: Identification of neural pathways that highlight reflex actions.
Page 97-100: Reflex Actions
Description: Highlights importance of reflex actions, types of reflexes and their physiological significance.
Page 101-103: Reflex Arc Functionality
Operation: Detailed description of impulse pathway upon stimulus triggering a reflex action.
Page 104-106: Revision Topics
Future Directions: Suggestions for upcoming activities and areas of focus for review.