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Signs of a pallidum lesion.

Lesion of pale globule and black matter causes parkinsonism – hypertonic-hypokinetic syndrome.

It occurs at a lesion of pale globule, black matter. Total restraint, hypoexpressions of movements (hypokinesia), muscle rigidity are characteristics. Static tremor is present. The person has face like mask. Beginning of arbitrary movements is difficult. Walking is with shallow steps. Voice is quiet, monotonic. Handwriting is small.

Signs of a striate body lesion. Striatic syndrome.

Hyperkinetic-hypotonic syndrome includes hypotonia or dystonia and different non-arbitrary violent excessive movements – hyperkinesias.

Chorea is lesion of midbrain tegmentum, lentiform and caudate nuclei. Unrhythmic fibrillations are typical.

Myoclonias are unrhythmic and unsynchronic contractions of various muscles of trunk, abdomen.

2. Study aims:

To know: cerebellum mopho-functional peculiarities; cerebellum connections with CNS other parts; clinical picture of cerebellum disorders.

To be able to: to perform movement co-ordination investigation.

3. Pre-auditory self-work materials.

3.1.Basic knowledge, skills, experiences, necessary for study the topic:

Histology

Cerebellum, intermediate brain and basal ganglia histological structure

Recognize intermediate brain main parts, cerebellum and basal ganglia preparations

Anatomy

Morphology and connections of cerebellum, intermediate brain and basal ganglia

Draw cerebellum nuclei and fibers

Biochemistry

Dophamine origin and role in human organism, hypothalamic hormones and melatonin biochemistry

Neurology

Cerebellum, intermediate brain and basal ganglia morphology, physiology

Analize human organism functions disorders features and explain their mechanisms (particularly at cerebellum pathology, parkinsonism and thalamic syndrome)

Dentistry

Maxillary-facial region disorders features at cerebellum and basal ganglia pathology

3.2.Topic content.

Intermediate brain physiology

It consists of:

1) hypothalamus;

2) thalamus;

3) epithalamus.

THALAMUS PHYSIOLOGY

Thalamus is a large ovoid mass of gray matter, situated bilaterally in diencephalon. Thalamus on both sides, lie close together in their rostral two thirds and are slightly separated by third ventricle. The caudal thirds are more widely separated by corpora quadrigemina.

Nuclei: Thalamus on each side is divided into five main nuclear groups by means of internal medullary septum.

A. Midline nuclei

B. Intralaminar nuclei

С.Medial mass of nuclei

D. Lateral mass of nuclei

E. Posterior group of nuclei

Thalamic radiation is the collection of nerve fibers connecting thalamus and cerebral cortex. It contains both inalamocortical and corticothalamic fibers. All these fibers between thalamus and cerebral cortex pass through internal capsule.

Thalamic radiations are divided into four groups, which are called thalamic peduncles or thalamic stalks.

Anterior (frontal) peduncle or radiation: connects the frontal lobe of cerebral cortex with medial and lateral thalamic nuclei. This contains mostly motor nerve fibers.

Superior (centrolateral) peduncle or radiation - the fibers of this peduncle connect post central gyrus (somesthetic area) of parietal lobe and adjacent area in frontal cortex with lateral mass of thalamic nuclei. This contains mostly sensory fibers.

Posterior (occipital) peduncle or radiation - connects occipital lobe of cerebral cortex with pulvinar and lateral geniculate body. This contains the nerve fibers concerned with vision.

Inferior (temporal) peduncle or radiation - fibers of this peduncle connect temporal lobe and insula with pulvinar and medial geniculate body. This peduncle contains the nerve fibers concerned with hearing.

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