D6 NEURO

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محاضرة General Anatomy اليوم....من غير خطأ مطبعي (Meninges)

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الشريحة 14:

Nervous System Division of the nervous system: Central nervous system: Brain. Spinal cord. Peripheral nervous system: Nerves : Spinal nerves:- 31 pairs Cranial nerves:-12 pairs Autonomic nervous system : Sympathetic nervous system. Parasympathetic nervous system.

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Central nervous system: Cerebrum = cerebral hemispheres. Cortex (is formed of grey matter). Medulla (is formed of white matter). Cerebellum. Brain stem: from above downwards: Midbrain. Pons. Medulla oblongata.

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Peripheral nervous system : Cranial nerves : They are 12 pairs. They leave the skull (cranium) by passing through foramina. I. Olfactory II. Optic III.Oculomotor IV. Trochlear V. Trigeminal VI.Abducent VII. Facial VII. Auditory IX.Glossopharyngeal X. Vagus XI. Accessory XII. Hypoglossal

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Spinal nerves They are 31 pairs,(8 cervical, 12 thoracic, 5 lumbar, 5 sacral and 1 coccygeal ). Typical spinal nerve: Each nerve arises from the spinal cord by 2 roots: Anterior(ventral) root:-containing motor fibers Posterior(dorsal) root:- containing sensory fibers. The 2 roots unite to form nerve trunk (mixed). The nerve trunk divides into: Ventral ramus . Dorsal ramus . Both contain mixed fibers.

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Functional classification of P.N.S Sensory (afferent) division: from peripheral receptors to spinal cord and brain. Motor(efferent) division : away from C.N.S

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Autonomic Nervous System It is concerned with the involuntary activities. It is divided into: Sympathetic nervous system . Parasympathetic nervous system. It is distributed pertly through C.N.S and partly through P.N.S.

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Meninges The coverings of Central Nervous System. Arranged from inside out: Dura mater ( outer , tough). Arachnoid mater( thin, web like). Pia mater ( inner, very thin). Under arachnoid matter lies subarachnoid space which contain C.S.F .

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Important Definitions: Nucleus: a group of cell bodies in CNS. Ganglion: a group of cell bodies in PNS .

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