cerebellum - tongji...
TRANSCRIPT
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Cerebellum
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Developmental sequence of
brain
Fourth week Fifth week
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Location of cerebellum
Lies above
and behind
the medullar
and pons and
occupies
posterior
cranial fossa
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Location of cerebellum
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External structures
Consists of two cerebellar hemispheres united in the
midline by the vermis
Primary fissure
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External structures
Lobules of cerebellum: Anterior lobe, posterior lobe, flocculonodular lobe.
Posterolateral fissure
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External structures
• Tonsil of cerebellum
two elevated masses
on inferior surface of
hemispheric portion,
just nearby foramen
magnum
• Cerebellar tonsilar
hernia
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Internal structures
• Cerebellar cortex – gray matter Granular layer, piriform (Purkinje) cell layer, molecular layer
• Cerebellar medulla – white matter Superior / Middle / Inferior cerebellar peduncles
• Cerebellar nuclei – gray matter within
white matter Fastigial, globose, emboliform, dentate nuclei
Interposed nucleus
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Cerebellar cortex
Molecular
layer
Piriform
cell layer
Granular
layer
White
matter
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Cerebellar nuclei
Fastigial, globose, emboliform, dentate nuclei
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Cerebellar peduncles
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Cerebellar peduncles
inferior cerebellar peduncle (restiform
body) connects with medulla and with
spinal cord, contain both afferent and
efferent fibers
middle cerebellar peduncle
(brachium pontis) connects with pons,
contain afferent fibers
superior cerebellar peduncle
(brachium conjunctivum) connects with
midbrain, contain mostly efferent fibers
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Functional divisions of cerebellum
• Vestibulocerebellum
– Archicerebellum
– Flocculonodular lobe
• Spinocerebellum
– Paleocerebellum
– Vermis and intermediate zone
• Cerebrocerebellum
– Neocerebellum
– Lateral zone Flocculonodular lobe
Ve
rmis
Inte
rme
diate zo
ne
Lateral zo
ne
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Connections and functions of
cerebellum
Vestibulocerebellum
• Connections
– Afferents: receives inputs from vestibular
nuclei and vestibular ganglion
– Efferents: projects to the vestibular nucleus
→ vestibulospinal tract and medial
longitudinal fasciculus → motor neurons of
anterior horn and cranial nuclei innervating
extraocular muscles
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Function: regulation of eyeball movements
and maintenance of body equilibrium.
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Spinocerebellum
Connections
• Afferents: receives somatic sensory information via
spinocerebellar tracts
• Efferents:
• Vermis projects to the fastigial nucleus →
vestibular nuclei and reticular formation →
vestibulospinal tract and reticulospinal tract →
motor neurons of anterior horn
• Intermediate zone projects to the interposed
nuclei – Contralateral red nucleus → rubrospinal tract →motor neurons of
anterior horn
– Contralateral VL of thalamus →cerebral cortex→ coticospinal
tract→motor neurons of anterior horn
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• Function:
modulate the
muscular tension.
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Cerebrocerebellum
• Connections
– Afferents: receives input from the cerebral
cortex via a relay in pontine nuclei
– Efferents: projects to dentate nucleus → VL
of thalamus → primary motor cortex →
corticospinal tract → motor neurons of
anterior horn
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• Function:
modulate the
coordination of
voluntary and
fineness
movement,
including
determination of
movement
strength, direction
and amplitude.
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Cerebellar functions
• Cerebellum has functions of
1. maintaining body posture,
2. controlling muscular tension,
3. coordinating of voluntary movement,
but NOT initiating and performing
voluntary movement.
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Cerebellar injury symptoms
Typical signs of
cerebellar injury:
a. Ataxia:
incoordination of
voluntary movement
b. Nystagmus: tremor
of eyeball
c. Intention tremor
Nose-to-finger test
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Diencephalon
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Location
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Location
Located
between
midbrain and
telencephalon,
mostly
surrounded by
cerebral
hemispheres
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Divisions of diencephalon
• (dorsal) thalamus
• metathalamus
• epithalamus
• subthalamus
• hypothalamus
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Dorsal thalamus External features
• A large egg-shaped nucleus mass,
• Right and left portion of thalamus are joined by interthalamic adhesion
• Anterior end called anterior thalamic tubercle,
• Posterior end called pulvinar
• Terminal stria
• Hypothalamic sulcus
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Dorsal thalamus
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Subdivision Principal Nuclei Common
abbreviation
Ant. nuclear group Anterior
Med. nuclear group dorsomedial
Lat. nuclear group
Dorsal layer Lateral dorsal LD
Lateral posterior LP
Pulvinar
Ventral layer Ventral anterior VA
Ventral lateral
(intermediate)
VL (VI)
Ventral posterior VP
Ventral posterolateral VPL
Ventral posteromedial VPM
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Functional subdivision
Non-specific projecting nuclei ---- receive afferents from
olfactory brain and reticular formation of brain stem (ascending
reticular activating system), project to hypothalamus, corpus
striatum and diffusely to cerebral cortex.
• Midline nuclei
• Intralaminar nuclei
• Thalamic reticular nuclei
Internuncial nuclei ---- receive a wide variety of afferent fibers
and in turn project widely to association areas of cerebral cortex,
involved in higher nervous activity of brain.
• Anterior nuclear group
• Medial nuclear group
• Dorsal layer of lateral nuclear group
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Functional subdivision
Specific relaying nuclei
• Ventral anterior nucleus (VA)
• Ventral lateral nucleus (VL)
Receive inputs from corpus striatum, dentate nucleus, and substantia
nigra, project to motor cortex to regulate body movement.
• Ventral posteromedial nucleus (VPM) -receives trigeminal lemniscus and taste fibers
• Ventral posterolateral nucleus (VPL) -receives medial lemniscus and spinal lemniscus
Projects to primary somatic sensory area via central thalamic
radiations
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Metathalamus
Lateral geniculate body (LGN)
Medial geniculate body (MGN)
Specific relaying nuclei
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Metathalamus
• Medial geniculate body (MGN)
– Relay station of audition
– Receive fibers from (brachium of) inferior colliculus
– Projects to auditory area via acoustic radiation
• Lateral geniculate body (LGN)
– Relay station of vision
– Receive fibers from retina (optic tract)
– Projects to visual area via optic radiation
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Epithalamus
Includes
• Thalamic medullary
stria
• Habenular trigone
• Habenular commissure
• Pineal body: Melatonin
• posterior commissure
Dorsal view
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Subthalamus
• Ventrally to the dorsal
thalamus
• Contains subthalamic
nucleus involved in movement regulation.
subthalamic nucleus
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Hypothalamus Position-lies ventral to thalamus
Boundaries
• Superior: hypothalamic sulcus
• Inferior:
– optic chiasma
– tuber cinereum
– Infundibulum (hypophysis)
– mamillary body
• Anterior: interventricular foramen
• Posterior: continues with midbrain
tegmentum
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Hypothalamus
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Hypothalamic divisions
Anterior to posterior
• Preoptic region
• Supraoptic region
• Tuberal region
• Mamillary region
A P
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Principal nuclei in hypothalamus • Preoptic region: preoptic nucleus
• Supraoptic region
– Supraoptic nucleus
– Paraventricular nucleus
produce antidiuretic hormone (ADH or vasopressin) and
oxytocin
• Tuberal region
– Infundibular (Arcuate) nucleus
– Ventromedial nucleus
– Dorsomedial nucleus
• Mamillary region
– Mamillary nucleus
– Posterior hypothalamic nucleus
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Preoptic nucleus
Supraoptic nucleus
Supra- chiasmatic nucleus
Anterior hypothalamic nucleus
Dorsomedial
nucleus
Paraventricular nucleus
Fornix Anterior commissure
Posterior hypothalamic nucleus
Lateral hypothalamic area
Ventromedial
nucleus
Optic chiasma
Infundibulum
(stalk of the
pituitary gland)
Pituitary
gland
Mammillary
body
The main hypothalamic nuclei
Arcuate nucleus
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Hypothalamus -- connection
• Connects with limbic system, brainstem, spinal cord and
dorsal thalamus
• Connects with hypophysis
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Hypothalamus -- connection
• Supraoptic nucleus →
supraopticohypophysial tract → posterior lobe of
hypophysis (neurohypophysis)
• Paraventricular nucleus →
paraventriculohypophysial tract → posterior lobe
of hypophysis (neurohypophysis)
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Parvicellular neurons in
the arcuate nucleus and
nearby region secrete
releasing and inhibiting
hormones →
tuberoinfundibular tract
→ portal vein of
hypophysis → anterior
lobe of hypophysis
Hypothalamus -- connection
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Thyroid-
stimulating
hormone
Adrenocorticot
ropic hormone
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Functions of hypothalamus
• Neuroendocrine center
• Subcortical higher regulatory center of the
visceral activity, such as
temperature regulation
food ingestion
reproduction
fluid and electrolyte balance
• Regulate emotional responses and biological
rhythms
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Third ventricle
• Position: a narrow ventriclar
cleft lies within diencephalon
– Lateral wall: dorsal thalamus
and hypothalamus
• Communication
Lateral ventricles → third
ventricle →midbrain aqueduct →
fourth ventricle