This review aims to demonstrate the relevance that medicinal plants and their promising results have in prevention and treatment of pain. The neurophysiological bases of pain have been analyzed and the potential mechanisms of action have been proposed, it has also been determined that the main experimental models used for the evaluation of the analgesic potential are: acetic acid-induced writhing test, formalin test, hot-plate test, capsaicin-induced nociception, cinnamaldehyde-induced nociception, glutamate-induced nociception, tail-flick test and tail immersion test. There are countless medicinal plants with potential analgesic activity, in some of them main responsible compounds for the activity are flavonoids (vitexin, quercetin, naringenin, astragalin, eupatilin), alkaloids (scotanamine B, bullatine A, S-(+)dicentrine, stephalagine, lappaconitine), terpenoids (p-cymene, thymol, menthol, citronellol, myrcene, carvacrol, linalool) and saponins (siolmatroside I, cayaponoside D, cayaponoside B4, cayaponoside A1); however, all studies have only been carried out up to pre-clinical stages. Therefore, it is recommended to carry out kinetic studies of the most remarkable natural compounds, evaluate mixtures of active compounds for diminishing doses to avoide possible side effects, and continue with clinical studies of medicinal plants whose safety has already been reported.

Background: Ipomoea batatas (L.) Lam. (I. batatas) is a root native from South America that is characterized by its antioxidant, antimicrobial and anti-inflammatory properties. These properties contribute to the wound healing process. Objective: To evaluate the healing activity of a gel based on I. batatas on dermal wound healing in mice. Material and methods: An acid ethanolic extract (1.5 N hydrochloric acid: Ethanol 96 ° 15:85, v / v) was prepared with the peels of the roots of I. batatas "purple sweet potato", which was incorporated into the formulations 0.5% and 1% gel. Mus musculus Balb / c with induced injury were distributed in four experimental groups: Group I (Control), which did not receive any treatment. Group II (Gel base), Group III (Gel I. batatas 0.5%) and Group IV (Gel I. batatas 1%) received the daily administration of topical treatments for 14 days. Wound closure was determined during the experimentation time, then they were euthanized with sodium pentobarbital 60 mg / kg / pc v.ip. to obtain skin samples for histopathological analysis. Results: Group IV shows a higher percentage of wound closure, which is also evidenced in histopathological changes. Conclusions: The 1% gel based on the ethanolic extract of the peels of the roots of Ipomoea batatas (L.) Lam. they show healing activity in wounds induced in mice, being the most effective treatment.

Learning and memory are linked, but they are different. Learning is a process by which knowledge about the environment is acquired and memory is the process by which knowledge is encoded, consolidated, stored and then retrieved. [10][11] Coding involves processes by which newly learned information is received when it is for the first time.Consolidation is a process that modifies newly stored and still labile information to make it more stable for long-term storage. Consolidation involves the expression of genes and the synthesis of new proteins, resulting in structural changes that store memory in a stable way over time. Storage refers to mechanisms and places that retain information over time. Recovery are processes that enable the retrieval and use of stored information. [12][13][14] Various types of memory have been proposed over the years,

Objective: Determine the content of total phenols and evaluate the gastroprotective effect of the extract of Persea caerulea (Ruiz & Pav.) Mez. in mice with induced gastric ulcer. Material and Methods: The bark of Persea caerulea was macerated in 70% ethanol and the phenol content was determined using the Folin-Ciocalteu method. The female Mus musculus Balb/c specimens were distributed in the following groups: White Control Group, without indomethacin dosing; Negative Control Group, dosing with indomethacin; Positive Control Group treated with ranitidine at a dose of 50 mg/kg; Groups P. caerulea treated with extract at doses of 50 mg/kg, 100 mg/kg and 200 mg/kg. Gastric ulcer was induced with indomethacin orally at a dose of 50 mg/kg, the procedure was repeated 12 hours later; Gastroprotective treatment was administered 60 minutes after each dose of indomethacin, 6 hours after the last dose, sodium pentobarbital was euthanized and the stomach was resected to determine ulceration using the Marhuenda Scale. Results: Higher percentages of gastric ulcer inhibition were obtained in the P. caerulea 100 mg/kg (80%) and P. caerulea 200 mg/kg (85.71%) groups. Conclusions: Extract of Persea caerulea (Ruiz & Pav.) Mez., At doses of 100 and 200 mg/kg of body weight, has a gastric antiulcerative effect which is related to its content of total polyphenols.