the autonomic nervous system fawzia al-rouq department of physiology college of medicine king saud...
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The Autonomic Nervous System
Fawzia Al-Rouq Department of PhysiologyCollege of MedicineKing Saud University
BASAL GANGLIA
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Objectives• Physiology of basal ganglia and regulatory
mechanisms• At the end of this lectutre the student should be
able to:-• 1-appreciate different nuclei of basal ganglia• 2-know different neurotransmitters that have a role
in basal ganglia functions• 3-appreciate general functions of basal ganglia• 4-diagnose basal ganglia disorders
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INTRODUCTION
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BASAL GANGLIA
• Basal ganglia are subcorticle nuclei of grey matter located in the interior part of cerebrum near about base
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OVERVIEW OF MOTOR ACTIVITY CONTROL
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THALAMIUS
BASAL GANGLIA
BRAIN STEM
Corticospinal tracts
Corticobulbar tracts
Bulbospinal tracts
Cerebral CortexCerebral CortexCEREBRAL CORTEX
CEREBELLUM
SPINAL CORD
FINAL COMMON PATH
SENSORY INPUT
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COMPONENTSFUNCTIONAL ANATOMY
BASAL GANGLIA
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Basal Nuclei
Subthalamic Nucleus
Caudate Nucleus
Putamen
Globus Pallidus
Substantia Nigra
LenticularNucleus
Corpus Striatum
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CONNECTIONS
BASAL GANGLIA
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Connections for Motor Control
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Basal Nuclei
Subthalamic Nucleus
Caudate Nucleus
Putamen
Globus Pallidus
Substantia Nigra
Lentiform
Corpus Striatum
3 Connections to remember1. Main input to the basal ganglia
2. Main output from the basal ganglia3. Connections between parts of basal ganglia
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The comes from the cerebral cortex (motor area) and projects to the NEOSTRIATUM
(a term for the caudate nucleus and putamen)
MAIN INPUT TO THE BASAL GANGLIA
Is via the thalamus to the cerebral cortex
(motor area)
THE MAIN OUTPUT
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BASIC CIRCUITS OF BASAL GANGLIA
1. Motor loop (putamen circuit) concerned with learned movment.
2. Cognitive loop (Caudate circuit) concerned with cognitive control of sequences of motor pattern. Basically it is concerned with motor intentions.
(Note: cognition means thinking process using sensory input with information already stored in memory.)
3. Limbic loop involved in giving motor expression to emotions like, smiling, aggressive or submissive posture.
4. Occulomotor loop concerned with voluntary eye movement [ saccadic movement] 14
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The Putamen Circuit
• Premotor• Suppl Motor• Somatosensory Cortex
• Prim Motor Cortex• Premotor• Suppl Motor Areas
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The Caudate Circuit
Association Areas
• Prefrontal• Premotor
• Suppl Motor
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Basal Ganglial PathwaysDirect and Indirect
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StGPe
GPiThalamus
SNPCSThN
+
+
Direct Basal Ganglial Pathway
-
+
↑ MOTOR ACTIVITY
GLU
↑ GABA
↓GABA DA1+
GLU
Thalamocortical Neuronsare disinhibited
-DA2 -
-
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StGPe
GPiThalamus
SNPCSThN
+
Indirect Basal Ganglial Pathway
↓ MOTOR ACTIVITY
-
-
-
+
GLU+
DA2 -
↑ GABA
↑GABA
↓GABA
GLU
Subthalamic Neuronsare disinhibited
+ DA1+GLU
-
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StriatumGPe
GPiThalamus
SNPCSThN
Both Direct & Indirect Basal Ganglial Pathway ↑ MOTOR ACTIVITY
↓ MOTOR ACTIVITY
Direct
Indirect
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StGPe
GPiThalamus
SNPCSThN
Both Direct & Indirect Basal Ganglial Pathway ↑ MOTOR ACTIVITY
↓ MOTOR ACTIVITY
+
-
-
-
-
+
+
+
-
-
+
GLU
DA1 +
GABA
GLU
↑GABA
GABA
GLU
DA2 -
GABA
GABA
GLUGLU
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• High Oxygen consumption .• High Copper content in Wilson’s disease
(Copper intoxication):• Autosomal Recessive • Copper binding protein Ceruloplasmin is
low• Lenticular degeneration occurs
Metabolic characteristics
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FUNCTIONS• Control of movements• Planning and programming of
movements• Cognition
BASAL GANGLIA
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• Basal ganglia function in association with the corticospinal system to control complex patterns of motor activity.
• Examples are: – writing of letters of the alphabet. – cutting paper with scissors, – hammering nails, – shooting a basketball through a hoop, – passing a football, – throwing a baseball, – the movements of shoveling dirt, – most aspects of vocalization, – controlled movements of the eyes – virtually any other of our skilled movements, most of
them performed subconsciously.
Executes Learned Patterns of Motor Activity
The Putamen Circuit
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• Cognition means the thinking processes of the brain, using both sensory input to the brain plus information already stored in memory. Thoughts are generated in the mind by a process called cognitive control of motor activity.
• Example:A person seeing a lion approach and then responding instantaneously and automatically by (1) turning away from the lion, (2) beginning to run, and (3) even attempting to climb a tree.
• Thus, cognitive control of motor activity determines subconsciously, and within seconds, which patterns of movement will be used together to achieve a complex goal
Cognitive Control of Sequences of Motor Patterns
The Caudate Circuit
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• Two important capabilities of the brain in controlling movement are – (1) to determine how rapidly the movement is
to be performed and – (2) to control how large the movement will be.
• For instance, a person may write the letter "a" slowly or rapidly. Also, he or she may write a small "a" on a piece of paper or a large "a" on a chalkboard. Regardless of the choice, the proportional characteristics of the letter remain nearly the same
Change the Timing and to Scale the Intensity of Movements
The Caudate Circuit
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DISORDERSMOVEMENTS (ATAXIA Rate, Range, Force, Direction)
SPEECHPOSTURE
GAITMENTAL ACTIVITY
OTHERS
BASAL GANGLIA
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Movement Disorders
Hyperkinetic•Hemiballismus
•Huntington’s Disease
•Athetosis
Hypokinetic•Parkinson’s Disease
•Drug Induced (Neuroleptics, MPTP)
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Movement Disorder
Features Lesion
Chorea Multiole quick, random movements, usually most prominent in the appendicular muscles
Atrophy of the striatum. Huntington Chorea
Athetosis Slow writhing movements,which are usually more severe in the appendicular muscles
Diffuse hypermyelination of corpus striatum and thalamus
Hemiballismus Wild flinging movements of half of the body
Hemorrhagic destruction of contralateral subthalamic n. Hypertensive patients
Parkinsonism Pill rolling tremor of the fingers at rest, lead pipe rigidity and akinesia
Degenration of Substantia Nigra
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Parkinson’s Disease
• Described by James Parkinson • Degeneration of dopaminergic nigrostriatal
neurons (60-80 %). • Phenthiazines (tranquilizers drugs) .• Methyl-Phenyl-Tetrahydro-Pyridine (MPTP). The
oxidant MPP+ is toxic to SN.• Five cardinal features
– Tremor– Rigidity– Akinesia & Bradykinesia– Postural Changes– Speech Changes
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Huntingtons Disease
Hereditory , autosomal dominant . Disease of caudate & putamen. Jerky movement of hands toward end of reaching
an object . Chorea Slurred speech and incomprehensive . Progressive Dementia -
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Cont. Huntingtons
Loss of GABA – Cholinergic neurons .
The loss of GABAergic neurons leads to chorea
Loss of Dopaminergic neurons leads to
Parkinson”s disease .
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Summary of functions of basal ganglia
• It play important motor function in starting and stopping motor functions and inhibiting unwanted movement.
• It changes the timing and scales the intensity of movements.
• Putamen circuit is inhibitory. Executes skilled motor activities for example cutting paper with a scissor, hammering on nail, shooting a basket ball & like throwing a base ball.
• Putamen circuit has indirect connection to cortex via thalamus.while caudate has direct conection to the cortex from thalamus.
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Cont…• Caudate circuit is excitatory, has instinctive
function which works without thinking and need quick response. eg. response after seeing a lion.
[Note: effects of basal ganglia on motor activity are generally inhibitory.]
Lesions of the basal ganglia produce effects on contra lateral side of the body
Damage to basal ganglia does not cause paralysis. However it results in abnormal movements
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