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Nervous SystemsPHYSIOLOGY
PHL-226
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Your Nervous System is the most complicated and fragile system. It tells all your other systems what to do. The Nervous System carries messages to the brain.
HUMAN NERVOUS SYSTEM
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HUMAN NERVOUS SYSTEM
It is divided into
*central nervous system (CNS)
*peripheral nervous system (PNS)
which is the brain and spinal cord
It consists of cranial and spinal nerves . which connects every organs to the CNS.
HUMAN NERVOUS SYSTEM
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cranial nerves-12
pairs
spinal nerves- 31 pairs
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5
Spinal nerves
They are a part of the peripheral nervous system There are 31 pairs of spinal nerves that
originated from spinal cord. They are named according to the spinal cord
segment from which they originate8 cervical12 thoracic5 lumbar5 sacral1 coccygeal
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C1
C1
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7
Cranial nerves
They are a part of the peripheral nervous system There are 12 pairs of cranial nerves that
originated from the brain it self They are numbered I to XII, Their names reflect
their general distribution or function.
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Name and functions of Cranial Nerves
CN Name Function
I Olfactory Sense of smell
II Optic Sense of vision
III Oculomotor Eye movementOpening of eyelid
IV Trochlear Eye movement
V Trigeminal Facial sensation Chewing (Jaw movements)
8
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Name and functions of Cranial Nerves
VI Abducens Eye movement
VII Facial Facial expression Taste sensation Closing of eye lid
VIII Vestibulocochlear Equilibrium or balance (vestibular)Hearing (cochlear)
IX Glossopharyngeal Taste sensation Swallowing
X Vagus Control most glands and visera
XI Accessory Control neck and shoulder muscles
XII Hypoglossal Tongue movements9
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CRANIAL NERVES
Learn them; mneumonic helps, e.g.:“Oh, oh, oh, to touch and feel very good velvet, ah!”
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NERVES (CRANIAL OR SPINAL) NERVES (CRANIAL OR SPINAL) may be may be
Sensory (Afferent) Sensory (Afferent) oror Motor (Efferent) Motor (Efferent)
e.g., skin
e.g., muscle
Gray’s Anatomy 38 1999
1-sensory (afferent) nerve
2- motor (efferent) nerve
It transmits commands from CNS to muscles, glands and organs
it sends signals or impulses from senses, skin, muscles, and internal organs to the CNS
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The Withdrawal Reflex
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cells of The Nervous System
The nervous system is formed of 2 main kinds of cells
–1) Neurons (nerve cells)
–2) Neuroglia ( glia cells)
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Neuron (nerve cell)
It is the Basic units of the nervous systemIt is the conducting cell as it transmits electrical impulses from one part of the body to another part
•anatomy later
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Neurons structure
Axon of anotherneuron
Axon of anotherneuron
Cell BodyCell BodyDendritesDendrites
AxonAxon
MyelinSheathMyelinSheath
Dendrites of another neuron
Dendrites of another neuron
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Specific Parts: The NeuronStructure
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Structure of neuron
Cell body •That contains nucleusDendritesMutiple branching hair like extensions that arise from the cell body of a neuron . It receives messages from other neurone and conducts impulses toward the cell bodyAxonSingle long extension of a neuron, ending in branching terminal fibers ( called axon terminals), through which messages are sent to other neurons or to muscles or glands
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Neural communication( Synapse)
–It is the site of junction , communication and connection between two neurons (sending and receiving neurons)
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Glial cells (neuroglia)
They are non conducting cells that cover some axons forming mylein sheath . The nerve fibers that are covered by mylein sheath are called myleinated nerve fibers Mylein sheath formed of lipid that give a white colour to the myelinated nerve axon They insulate, support and protect nerve cells
anatomy later
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The brain and spinal cord are protected by :-
1- The bony skull for the brain and vertebrae for the spinal cord
Protection of the Brain
2- Meninges
3- Cerebrospinal Fluid
4-Blood-Brain Barrier
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The brain and spinal cord are covered by a tissue known as the
meninges The meninges is made up of 3 layers: 1. Dura Mater – Which is the outer most layer
under the bony skull. It is strongly adherent to the
base of the skull It is a tough layer, as it is formed of strong
connective tissue thus called tough mother
Meninges
3. Pia Mater – It is the innermost layer covering the brain loosely, and passing over sulci which . It is formed of a delicate membrane thus called delicate mother.
2. Arachnoid Layer – It is the middle layer .it is a‘spider’ web like structure filled with cerebrospinal fluid ( CSF ).
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Subdural space Potential space between dura and
arachnoid mater.
Meningeal Spaces
Epidural spacePotential space superior to dura.
Subarachnoid spaceFilled with CSFContains the blood vessels
supplying brain.
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.
Functions of the Meninges
1- protects the central nervous system and cerebral blood vessels .
2- It contain CSF .
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.1- Cerebrospinal fluid (CSF) is a clear, colorless, bodily fluid that occupies the subarachnoid space and the ventricular system of the brain and spinal cord
2- CSF is produced in the choroid plexus. It circulates from the lateral ventricles to the foramen of Monro , third ventricle, aqueduct of Sylvius, fourth ventricle, foramen of Magendie, and the subarachnoid space over the brain and the spinal cord .
3- in adult the total volume of CSF is a bout 150 mL.
CSF
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1- Protection of the brain :- CSF protects the brain tissue from different type of trauma . 2- nourishes the brain :- CSF carries nutrient from the blood to the brain 3- chemical stability :- it removes waste products from the brain
Functions of the CSF
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Blood brain barrier (BBB)
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Sensation : is a state of awareness of a stimulus.
Sensation requires:-
1)A stimulus : Any changes in the environment, either internal or external , e.g. body temp, pH, light, sound, pressure ….. etc.
2)Receptor : which receive stimulus
3)Conduction of nerve impulse to the CNS
4)Translation at different regionS of the brain
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A: Free nerve endings (pain, temperature)
B: Pacinian corpuscle (pressure)
C: Meissner’s corpuscle (touch)
D: Muscle spindle (stretch of muscle )
E: Merkel discs (light touch) D: Ruffini’s corpsucles (deep
pressure and stretch)
A
B C
D
E
F
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Carries pain, temperature, touch and pressure signals1st neuron enters spinal cord through dorsal root2nd neuron crosses over in spinal cord; ascends to thalamus3rd neuron projects from thalamus to somatosensory cortex
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Spinothalamic PathwayPrimary somatosensory cortex
Thalamus
Medulla 1st neurone enters spinal cord through dorsal root
Spinothalamic tract 2 nd neurone decussates
the spinal cord and ascend to the thalamus
1st 2nd
3rd 3rd neurone arise from thalamus to somatosensory area of the cortex
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Cones and Rods mediate different kinds of vision
◦Cones – photopic (day time) vision High sensitive to color in a good lighting
◦Rods – scotopic (night time) visionHigh-sensitivite to low-acuity vision in dim light
NB:Rods and cones present in the retina of the eye
Cone and Rod Cone and Rod are receptor are receptor for Visionfor Vision
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Figure 6.5
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Olfactory epithelium in the nose acts as a receptor for smell sensation
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59
Cochlea
Vestibulocochlear nerve sends impulses to the auditory cortex of the temporal lobe of brain and interpreted as sound
Auditory ( hearing ) receptor : The special receptor for hearing is the hair cells in the organ of corti which is present inside the cochlea in the inner air
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Equilibrium: is the ability to detect head position and movement ( or acceleration)Utricle and saccule contain sensory or receptor cells for linear-acceleration Crista ampularis contain sensory cells for rotational- acceleration