medullary

Examples of medullary in the following topics:

• Epithalamus and Pineal Gland

  • It includes the habenula and their interconnecting fibers the habenular commissure, the stria medullaris, and the pineal gland.
  • The stria medullaris, also known as stria medullaris thalami, is a fiber bundle containing afferent fibers from the septal nuclei, lateral preoptico-hypothalamic region, and anterior thalamic nuclei to the habenula.

• Nephron: The Functional Unit of the Kidney

  • This last part of the nephron connects with and empties its filtrate into collecting ducts that line the medullary pyramids.
  • As urine travels down the collecting duct system, it passes by the medullary interstitium, which has a high sodium concentration as a result of the loop of Henle's countercurrent multiplier system.
  • Urine leaves the medullary collecting ducts through the renal papillae, emptying into the renal calyces, the renal pelvis, and finally into the bladder via the ureter.

• Meristems

  • Apical meristems are organized into four zones: (1) the central zone, (2) the peripheral zone, (3) the medullary meristem and (3) the medullary tissue .
  • Pictured here are the (1) central zone, (2) peripheral zone, (3) medullary meristem and (3) medullary tissue.

• Medulla Injury

  • Lateral medullary syndrome, also called Wallenberg syndrome and posterior inferior cerebellar artery syndrome, is a disease that presents with a constellation of neurologic symptoms due to injury to the lateral part of the medulla in the brain, resulting in tissue ischemia and necrosis, typically from blood clot (stroke) impeding the vertebral artery and/or the posterior inferior cerebellar artery .
  • Treatment for lateral medullary syndrome involves focusing on relief of symptoms and active rehabilitation to help those suffering from the syndrome recover their activities of daily living and cope with neurologic loss that can be psychologically devastating.
  • The outlook for someone with lateral medullary syndrome depends upon the size and location of the area of the brain stem damaged by the stroke.

• Characteristics of Nervous Tissue

  • The Schwann cells are underlain by the medullary sheath.
  • The medullary sheath is interrupted at intervals by the nodes of Ranvier.

• Growth of Bone

  • Osteoclasts, cells that work to break down bone, resorb old bone that lines the medullary cavity.
  • The erosion of old bone along the medullary cavity and the deposition of new bone beneath the periosteum not only increase the diameter of the diaphysis, but also increase the diameter of the medullary cavity.

• Hypoglossal (XII) Nerve

  • The hypoglossal nerve emerges from the medulla oblongata in the preolivary sulcus where it separates the olive (olivary body) and the pyramid (medullary pyramid).

• Cerebrospinal Fluid and Its Circulation

  • (1) posterior medullary velum (2) choroid plexus (3) cisterna cerebellomedullaris of subarachnoid cavity (4) central canal (5) corpora quadrigemina (6) cerebral peduncle (7) anterior medullary velum (8) ependymal lining of ventricle (9) cisterna pontis of subarachnoid cavity

• Horner's Syndrome

• Epinephrine and Norepinephrine

  • Norepinephrine is synthesized from dopamine by dopamine β-hydroxylase in the secretory granules of the medullary chromaffin cells and is released from the adrenal medulla into the blood as a hormone.