Spinal Cord - created from Mind Map

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White Matter: myleinated axons

Grey matter: unmyelinated cell bodies/soma

Roots: Connect spinal nerves to horns

Rami: Travel from the body to the spinal nerve

Pathways

Plexuses: Groups of nerves from the ventral rami

Reflexes

Anatomy

Meninges

Vertebrae

Dorsal column

Ventral Column

Lateral column

posterior

Anterior

Horns: Bring information in/out of spinal cord

2. Choose a horn based on type (sensory v motor) and classification (somatic v visceral)

Dorsal Horn

Lateral Horn

Ventral Horn

distinguished by type of information they carry

Sensory (visceral and somatic)

Visceral motor

Somatic motor

Dorsal Root

Ventral Root

Distinguished by type of information (sensory or motor)

1. Choose a root based on type of information

Dorsal root ganglion

Contains cell bodies

Psuedounipolar neurons

Contains cell bodies

Classified by location of destination or origin

Ventral Ramus

Dorsal Ramus

Communicating Rami

3. Choose a ramus based on destination

Front sides of body

Back side of the body

Smooth/cardiac muscle, glands

Cell bodies located in sympathetic ganglion

Visceral motor and sensory

Sympathetic chain

Runs parallel and anterior to spinal cord

Carried to sympathetic trunk

Ascending: Send sensory information to the brain

Descending: Send instructions to muscles for motor function

Neurons

2 synapses

Types

1st order neuron

2nd order neuron

3rd order neuron

Cell bodies

Peripheral sensor neuron

Body to dorsal horn

Interneuron

Travels from dorsal horn up lateral column to thalamus

Interneuron

Travels from thalamus to cerebral cortex

Decussates at pyramids of medulla

Located in dorsal horn and thalamus

Dorsal column-medial leminscus

Spinothalamic

Spinocerebellar

Neurons

1 synapse

Upper motor neuron

Lower motor neuron

Cell Bodies

Interneuron

Travels from primary motor cortex to ventral horn through the ventral column

Motor neuron

Travels from the ventral horn to the muscle

Located in ventral horn

Intercostal nerves

Cervical plexus

Brachial Plexus

Lumbosacral plexus

Runs along ribs

Innervates muscles and skin of abdominal wall, bones

Innvervates neck

Innervates arm

C5-T1

Innervates legs

L2-S4

Polysynaptic Reflex Arc

Monosynaptic Reflex Arc

Sensory Neuron (travels along rami to spinal nerve)

Dorsal Horn

Interneuron (gray matter)

Where sensory neuron synapses with interneuron

Ventral horn

Can also go outside of spinal column

Ventral Root

Where interneuron synapses

Muscle

Sensory neuron (travels along ramus)

Ventral horn

Muscle

Conus Medullaris

Cauda Equina

Filum Terminale

Denticulate ligaments

Vertebral foramen

Vertebral canal

Intervertebral foramen

Termination of spinal cord at L1/L2

Bundle of spinal nerve roots that lumbar, sacral, and coccygeal nerves pass through

Holds spinal cord down to sacrum and coccyx

Continuation of pia mater

Extention of pia mater that stabilize spinal cord in vertebral canal

Where spinal nerves emerge through foramina in vertebrae, forms vertebral canal

Location of spinal cord

Where the spinal cord runs through

Spaces between vertebrae where spinal nerves exit

Between vertebrae

Dura Mater

Arachnoid Mater

Subarachnoid Space

Pia Mater

Central Canal

Anterior median fissure

Epidural Space

Location of CSF

Fluid-filled

Continuity with ventricles of brain

Filled with fat and blood vessels

Cervical

Thoracic

Lumbar

Sacral

Coccygeal

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