Start Key Terms: Anatomy & Physiology: Nervous System Anatomy

Question: alar plate

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developmental region of the spinal cord that gives rise to the posterior horn of the gray matter

Question: anterior spinal artery

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blood vessel from the merged branches of the vertebral arteries that runs along the anterior surface of the spinal cord

Question: anterior median fissure

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deep midline feature of the anterior spinal cord, marking the separation between the right and left sides of the cord

Question: arachnoid mater

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middle layer of the meninges named for the spider-weblike trabeculae that extend between it and the pia mater

Question: amygdala

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nucleus deep in the temporal lobe of the cerebrum that is related to memory and emotional behavior

Question: ascending tract

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central nervous system fibers carrying sensory information from the spinal cord or periphery to the brain

Question: arachnoid trabeculae

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filaments between the arachnoid and pia mater within the subarachnoid space

Question: anterior column

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white matter between the anterior horns of the spinal cord composed of many different groups of axons of both ascending and descending tracts

Question: abducens nerve

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sixth cranial nerve; responsible for contraction of one of the extraocular muscles

Question: arachnoid granulation

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outpocket of the arachnoid membrane into the dural sinuses that allows for reabsorption of CSF into the blood

Question: anterior horn

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gray matter of the spinal cord containing multipolar motor neurons, sometimes referred to as the ventral horn