There are 2 types of cells in the Nervous System: 1) Neurons

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Presentation transcript:

There are 2 types of cells in the Nervous System: 1) Neurons Communication cell 2) Glial cells Support cell Ganglia

The Neuron

Anaxonic Bipolar Unipolar Multipolar

PNS CNS Sensory Pathway Receptors Interneuron (Integration) Motor Pathway Effector Tissue

Axon Myelination

The Glial Cells Glial Cells

Nervous System Terminology Gray Matter – mostly nerve cell bodies. White Matter – mostly myelinated axons. Nerve fiber – a single axon of a neuron. Nerve – a bundle of axon in the PNS. Tract – a bundle of axon in the CNS. Columns – are groups of tracts. Ganglion – a cluster of nerve cell bodies in PNS. Nucleus – gray matter in CNS with discrete boundaries and common function.

Anatomy of a Nerve Neurolemma Axolemma

31 pairs of Spinal Nerves 8 Cervical (C1-C8) 12 Thoracic (T1-T12) white matter = columns gray matter = horns 31 pairs of Spinal Nerves 8 Cervical (C1-C8) 12 Thoracic (T1-T12) 5 Lumbar (L1-L5) 5 Sacral (S1-S5) 1 Coccygeal (Co1)

Spinal Plexus: is a re-arrangement of spinal nerves into (in the Nervous System) is a re-arrangement of spinal nerves into functional groups. Cervical (C1-C5) Brachial (C5-T1) Lumbar (T12-L4 ) Sacral (L4-S4)

Spinal Meninges - Dura Mater - Arachnoid - Pia Mater Dense irregular CT + Simple squamous epithelium - Arachnoid Simple squamous epithelium - Pia Mater Collagen and elastic fibers

Spinal Cord Anatomy (x.s.)

Amyotropic Lateral Sclerosis (ALS) Lou Gehrig Stephen Hawking