Chapter 13 Spinal Cord and Reflexes Flashcards

•The Spinal Meninges •Specialized membranes isolate spinal cord from surroundings •Functions of the spinal meninges include: •Protecting spinal cord •Carrying blood supply •Continuous with cranial meninges •Meningitis •Viral or bacterial infection of meninges

The subarchnoid space is filled with cerbrospinal fliud (area between the archnoid space and pia mater)

Carries dissolved gases, nutrients, and wastes Pia mater

Ending of spinal cord Thin, conical spinal cord below lumbar enlargement

Thin thread of fibrous tissue at end of conus medullaris Attaches to coccygeal ligament

Nerve roots extending below conus medullaris

Extend from pia mater to dura mater Stabilize side-to-side movement

A passageway along the longitudinal axis of the spinal cord Contains CSF (Cerebrospinal Fluid) Surrounded by gray matter

Surrounds central canal of spinal cord Contains neuron cell bodies, neuroglia, unmyelinated axons Has projections (gray horns)

Posterior gray horns Contain somatic and visceral sensory nuclei; back Anterior gray horns Contain somatic motor nuclei; front Lateral gray horns Are in thoracic and lumbar segments; contain visceral motor nuclei; middle

Axons that cross from one side of cord to the other before reaching gray matter

Is superficial Contains myelinated and unmyelinated axons

Posterior white columns Lie between posterior gray horns and posterior median sulcus Anterior white columns Lie between anterior gray horns and anterior median fissure Lateral white columns Located on each side of spinal cord between anterior and posterior columns

Area where axons cross from one side of spinal cord to the other

-Cell bodies of neurons formed into functional groups -Masses of gray matter within the CNS

Somatic
Receive information from outside Skin

Visceral
Recieves information from inside the body
Organs