Category: H
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Heterecism
The state of being heterecious; the development of different cycles of existence in different hosts, said of certain parasites.
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Heterecious
Denoting a parasite living in different hosts at different stages of development.
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Hetastarch
A synthetic polymer plasma volume expander composed of more than 90% amylopectin molecules. It has an average molecular weight of 450,000.
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Hesselbach’s triangle
The interval in the groin bounded by Poupart’s ligament, the edge of the rectus muscle, and the deep epigastric artery.
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Hesselbach’s hernia
A lobated hernia that passes through the cribriform fascia of the anterior thigh.
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Hesitancy
Involuntary delay in initiating urination. This symptom may be caused by drugs, such as tricyclic antidepressants, by abnormal relaxation of the detrusor muscle of the bladder, by prostatic hyperplasia, and by other urinary tract disorders.
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Heschl’s gyrus
One of a set of short transverse gyri in the temporal lobe along the lateral sulcus. The gyri of Heschl include the primary auditory cortex.
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Hertwig’s root sheath
A downgrowth of epithelium from the cervical loop of the enamel organ that induces dentin formation of the forming tooth root and determines its shape. The epithelial diaphragm, a horizontal extension of the Hertwig’s root sheath, will determine the number and size of the tooth roots.
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Hersage
The splitting of a nerve trunk into separate fibers.
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Herring bodies
Secretory granules found in the terminal nerve endings of the hypothalamus and hypophyseal tract.