Nervous System (NS)

Nerve Fascicles

A small bundle of nerve fibers, wrapped in a protective layer, that makes up a part of a larger nerve

Tract

A bundle of nerve fibers(White matter)

Connects parts of the brain or spinal cord

Allows communication within the central nervous system

Cerebrum

Large brain part,

responsible for cognitive function such as thinking, memory, movement, perception & voluntary movement.

Two halves, with lobes

Brain

Controls the body.

Made of cerebrum, Cerebellum, and brain stem.

Endoneurium

Wraps a layer of CT that surrounds an individual nerve fibers(Axon) within a nerve fascicle

Provides support and protection.

Epineurium

Protective covering that surrounds a nerve.

Peripheral Nervous System (PNS)

Nerve outside the brain & spinal cord.

Send info to & from the CNS

Spinal Nerve

31 pairs of nerves from the spinal cord.

Send sensory & motor signal to/from the body

Perineurium

Wraps nerve fibers bundles.

Supports & Potects

Epinerium

Outer layer of a nerve.

Protects & supports.

Nucleus (collective term)

A cluster of nerve cell bodies (gray matter)

Deep inside the brain of spinal cord.

Processes information.

Collective term for a group of cell bodies in the CNS

Spinal Cord

Nerve bundle from brain to back.

Sends signals between brain & body.

Cranial Nerve

12 Nerve pairs from the brain.

Controls head/neck functions.

Specific job (muscle control, senses, organs)

Neurilemma

Outer Schwann cell layer.

Protects, Supports, & repairs axons.

Brain Stem

Connects brain to spinal cord.

Controls basic life functions.

Neuron

Brain’s building blocks.

Sends signals between electrical/chemical signals.

Central Nervous System (CNS)

Brain & spinal cord.

Processes info, Controls the body

Nerve

Bundles of axons.

Sends signals between signals between the body & brain.

Ganglion

Cluster of nerve cell bodies.

Outside the CNS.

Processes sensory info

Cerebellum

Back of the brain.

Controls balance, movement, and coordination.

Schwann Cell

Wrap axon in the PNS.

Form Myelin, which insulates & protects.

Myelin Sheath

A Fatty layer that covers the axon of some neurons and helps speed neural impulses

Neurofibril

Glial cells

Glial of Glia cells

Schwann cell

Oligodendrocyte

Astrocyte

Microglia

Ependymal cell