14 White matter. Substantia alba. Consists of myelinated nerves and is organized into three cords (funiculi) which contain the nerve pathways. A
15 Substantia gelatinosa centralis. A narrow zone around the central canal with processes from ependymal cells.
16 GRAY COLUMNS. Columnae griseae. Three ridge-like columns of gray matter. B
17 Anterior column. Columna anterior. It is comprised predominantly of motor neurons (anterior horn cells). B
18 Anterior horn. Cornu anterius. Hook-shaped structure seen in transverse section of the spinal cord. D
19 Anterolateral nucleus. Nucleus anterolater-alis. Situated anterolaterally in the anterior horn, it is localized in segments C4-8 and L2-S1 and innervates the muscles of the limbs. D
20 Anteromedial nucleus. Nucleus anterome-dialis. From its anteromedial position in the anterior horn, it extends the entire length of the spinal cord.D
21 Posterolateral nucleus. Nucleus posterolater-alis. It lies posterior to the anterolateral nucleus in segments C5-T1 and L2-S2 and innervates the muscles of the limbs. D
22 Retroposterolateral nucleus. Nucleus retro-posterolateralis. It lies posterior to the post-erolateral nucleus in segments C8-T1 and S1-3. D
23 Posteromedial nucleus. Nucleus posterome-dialis. From the vicinity of the white matter, it extends over segments T1-L3 and probably innervates the trunk musculature. D
24 Central nucleus. Nucleus centralis. A less prominent group in several cervical and lumbar segments. D
25 Nucleus of accessory nerve. Nucleus nervi ac-cessorii (nuc. accessorius). It lies in segments C1-6 in the area of the anterolateral nucleus and provides the root fibers of the spinal portion of the accessory nerve. D
26 Nucleus of phrenic nerve. Nucleus nervi phrenici (nuc. phrenicus). It lies in the middle of the anterior horn and extends from segments C4-C7. D
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This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.