. Elements of pathological anatomy. Anatomy. SECT. I.] HERPES. 397. straight or tortuous, and sev- Fis- 42- eral lines in length. The acarus (Figs. 41 and 42) is of a white, opaque color, and about the size of the sharp extremity of the fin- est needle, presenting, when seen through the microscope, the form of a tortoise. It has eight small feet, and the head is a perfect retract- ing sucker : the belly pre- sents several dark-colored spots, and on the back are to be seen a number of eccentric lines, placed at short intervals, and having the appearance of joints.* Willan and Bateman have subdi
. Elements of pathological anatomy. Anatomy. SECT. I.] HERPES. 397. straight or tortuous, and sev- Fis- 42- eral lines in length. The acarus (Figs. 41 and 42) is of a white, opaque color, and about the size of the sharp extremity of the fin- est needle, presenting, when seen through the microscope, the form of a tortoise. It has eight small feet, and the head is a perfect retract- ing sucker : the belly pre- sents several dark-colored spots, and on the back are to be seen a number of eccentric lines, placed at short intervals, and having the appearance of joints.* Willan and Bateman have subdivided herpes into six spe- cies, — a circumstance which, considering that they all occur pretty much under the same states of the constitution, and require the same kind of treatment, may be considered as a sort of " hair-splitting," certainly as unnecessary in pathology as it is injurious. The disease is characterized by distinct but irregular clusters of vesicles, which are set in close proximity, upon a vividly red base, surrounded by intervals of sound skin. The spots thus formed vary in size from that of a guinea to that of the palm of the hand, and the vesicles from the smallest pin-head to that of a pea. The lymph of the vesicles, which is at first clear and colorless, becomes gradually milky and opaque, and ultimately con- cretes into thin brownish scabs, which fall off about the tenth day from the time of their eruption. Sometimes tedious ulcerations ensue, leaving strongly-marked cicatrices; and now and then the disease disappears by desquamation, the fluid being absorbed by the end of the first week. In the zonoid variety, vulgarly called " shingles," the vesicles are aggregated into irregular oblique patches, in the form of a half belt. According to Cazenave, the patches generally begin at the centre of the body, from whence they extend in * See American Journal of the Medical Sciences for February, which is a full account of this insect, with
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Keywords: ., bookauthorgr, bookcentury1800, bookdecade1840, booksubjectanatomy
