Central Nervous System

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Presentation transcript:

Central Nervous System Protecting the CNS Spinal Cord

Components of the CNS Spinal Cord Brain Stem Cerebellum Cerebrum Brain

Protecting the Brain & Spinal Cord Protected provided by: 1) Bone (skull & vertebrae)

Protecting the Brain & Spinal Cord Protected provided by: 1) Bone (skull & vertebrae) 2) Membranes (meninges)

The Meninges in the Brain

Meninges in the Spinal Cord Pia Mater Arachnoid Mater Dura Mater

Protecting the Brain & Spinal Cord Protected provided by: 1) Bone (skull & vertebrae) 2) Membranes (meninges) 3) Watery Cushion (cerebrospinal fluid)

Cerebrospinal Fluid (CSF) Greatly reduces brain weight Fills layer between _______ and ______ mater

Formation & Circulation of CSF

Protecting the Brain & Spinal Cord Protected provided by: 1) Bone (skull & vertebrae) 2) Membranes (meninges) 3) Watery Cushion (cerebrospinal fluid) 4) Blood-Brain Barrier

The Blood-Brain Barrier

The Blood-Brain Barrier Why is there a blood-brain barrier? Capillaries have VERY low permeability Permeable to O2, CO2, glucose

Central Nervous System Protecting the CNS Spinal Cord

The Spinal Cord Foramen magnum - L2 31 spinal nerves

Dorsal & Ventral Roots of PNS Dorsal Root – Aggregation of afferent axons from:

Dorsal & Ventral Roots of PNS Dorsal Root – Aggregation of afferent axons from: Ventral Root – Aggregation of efferent axons to:

The Spinal Pathways Information can move in 3 directions: Ascending - to brain Descending - from brain Transverse – across the spine

The Spinal Reflex Involves transverse spinal pathway Interneurons link some sensory and motor neurons Common example: 1) knee-jerk response (patellar reflex)

The Patellar Stretch Reflex

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