Introduction of Chan Tui:Periostracum Cicadae or Cicada Slough.

TCM Herbalism:Medicinals and Classifications. ✵The article gives records of the herb Cicada Slough, its English name, Latin name, property and flavor, its source one insect species, (1).Cryptotympana pustulata Fabr., with a detailed introduction to the botanical features of this insect, the growth characteristics, and ecological environment of this insect, the features of the herb Cicada Slough, its pharmacological actions, medicinal efficacy, and administration guide.

Periostracum Cicadae(Cicada Slough).

Cicada Slough:on a tree branch Pin Yin Name: Chán Tuì.
 English Name: Cicada Slough.
 Latin Name: Periostracum Cicadae.
 Property and flavor: cool, pungent.

 Brief introduction: The herb Periostracum Cicadae is the slough shed by the nymph of Cryptotympana pustulata Fabr., used (1).to disperse wind and heat in the treatment of wind-heat affliction, (2).to promote eruption for measles and relieve itching for urticaria, (3) .to remove the nebula and improve eyesight, and (4).to relieve spasm in infantile convulsion and tetanus.

 Source: The herb Periostracum Cicadae (Cicada Slough) is the slough shed by the nymph of Cryptotympana pustulata Fabr., it is an insect of the Cicadidae family of the Hemiptera order. It is also known as Periostracum Cicadae, Cicada Slough, Chán Tuì.

 Cryptotympana pustulata Fabr.:a living Cicada on a tree Herbal classic book defined the herb Periostracum Cicadae(Cicada Slough, or Chán Tuì) as the slough shed by the nymph of (1). Cryptotympana pustulata Fabr. This commonly used species is introduced:

(1).Cryptotympana pustulata Fabr.

 Description of the Insect: It is also known as black cicada. Large black and shiny body; The male is 4.4~4.8 cm long with a wingspan of about 12.5 cm, while the female is slightly shorter. 1 pairs of compound eyes, large shape, there are 3 single eyes between two compound eyes, 1 pair antennae. The mouth is well-developed, spines and suckers, the labial base is comb-like, the upper lip is wide and short, the lower lip is elongated into a tube, up to the base of the 3rd pair of feet. The chest is well-developed, with a prominent cone-shaped protuberance on the posterior thoracic abdominal plate, extending backward. 3 on foot. 2 pairs of wings, membranous, dark brown, translucent, base stained yellowish-green, wings stationary when covered in the back as a ridge. The total abdominal volume of 7 sections, the abdomen of the male cicada has a special articulation organ, the female cicada has the same part.

 Cryptotympana pustulata Fabr.:a Cicada comes from slough on a tree Ecological environment and Habitat:  the insect lives on trees of poplar, willow, elm, locust, and maple. It takes 12 to 13 years to pass through a generation. Resource distribution: it distributes in most areas of south China.

 Habits of living: The adult insect mostly lives in the willow, the maple, the poplar, the apple tree, the pear tree, the peach tree, the apricot tree, and so on broadleaf trees. It is mainly produced in the lower reaches of the Yangtze River in China.

 Characters of herbs: The herb is slightly elliptical and curved, the whole herb looks like cicada and hollow, about 3.5 cm long and about 2 cm wide. The surface is yellowish brown, translucent and shiny. There are 1 pair of filiform antennae (filiform antenna) in the head, most of which have been broken off, and the compound eyes are protuberant. The frontal apex is protuberant, the muzzle is well-developed, the upper lip is short and wide, and the lower lip is elongated into a tubular shape. The back of the chest is split in a cross shape, the split is curled inward, and there are 2 pairs of winglets on both sides of the back; The ventral surface has three pairs of feet, and is covered with yellow-brown fine hairs. The abdomen is blunt and round, totally 9 sections. The herb is light, hollow and fragile (frangible). It has a slight smell, the taste is light.

 Pharmacological actions: ①.anticonvulsant; ②.sedative; ③.antipyretic; ④.anti-allergic; ⑤.immunosuppressive; ⑥.analgesic effects; ⑦.selectively inhibit the growth of cancer cells.

 Medicinal efficacy: Dispel wind and dissipate heat, open the inhibited lung-energy, antispasmolysis, promoting eruption to relieve itching, removing nebula for improving eyesight, indicated for exogenous wind-heat affection, coughing and hoarsen, the poor eruption of measles, urticaria and itching, convulsive epilepsy or frightened epilepsy in children, red eyes, nebula, furuncle and malignant boils, tetanus.

 Administration of Periostracum Cicadae (Chán Tuì):
Reference: Administration Guide of Periostracum Cicadae (Chán Tuì)
TCM Books: ①.Internally:3~6 grams; ②.1~2 qian (about 3~6 grams),or prepare to pill,powder.Externally:wash with water decoction,or prepare to finely ground herb powder and apply stick; ③.3~6 grams, or prepare to pill,powder.Externally:proper amount,wash with water decoction, or prepare to finely ground herb powder and apply stick, or 3~10 grams, water decoction, take after mixing its fine powder with water or wine, big dosage needed for relieve spasmolysis.
 Precautions: cautious use during pregnancy.

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