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Anococcygeal Raphe Revisited: A Histological Study Using Mid-Term Human Fetuses and Elderly Cadavers
Yusuke Kinugasa,Takashi Arakawa,Hiroshi Abe,Shinichi Abe,조백환,Gen Murakami,Kenichi Sugihara 연세대학교의과대학 2012 Yonsei medical journal Vol.53 No.4
Purpose: We recently demonstrated the morphology of the anococcygeal ligament. As the anococcygeal ligament and raphe are often confused, the concept of the anococcygeal raphe needs to be re-examined from the perspective of fetal development,as well as in terms of adult morphology. Materials and Methods: We examined the horizontal sections of 15 fetuses as well as adult histology. From cadavers,we obtained an almost cubic tissue mass containing the dorsal wall of the anorectum, the coccyx and the covering skin. Most sections were stained with hematoxylin and eosin or Masson-trichrome solution. Results: The adult ligament contained both smooth and striated muscle fibers. A similar band-like structure was seen in fetuses, containing: 1) smooth muscle fibers originating from the longitudinal muscle coat of the anal canal and 2) striated muscle fibers from the external anal sphincter (EAS). However, in fetuses, the levator ani muscle did not attach to either the band or the coccyx. Along and around the anococcygeal ligament, we did not find any aponeurotic tissue with transversely oriented fibers connecting bilateral levator ani slings. Instead, in adults, a fibrous tissue mass was located at a gap between bilateral levator ani slings; this site corresponded to the dorsal side of the ligament and the EAS in the immediately deep side of the natal skin cleft. Conclusion: We hypothesize that a classically described raphe corresponds to the specific subcutaneous tissue on the superficial or dorsal side of the anococcygeal ligament.
Antimicrobial Prophylaxis in Urological Surgery
Shingo Yamamoto,Katsumi Shigemura,Hiroshi Kiyota,Soichi Arakawa,Japanese Research Group for UTI 대한요로생식기감염학회 2016 Urogenital Tract Infection Vol.11 No.3
Surgical site infection (SSI) is defined as an infection occurring within one month from surgery or intervention. SSIs are classified into three categories: Clean, clean-contaminated, and contaminated. They are defined as procedures that avoid entering the urinary tract, involve entry of the urinary tract, and involve the bowels, respectively. The purpose of antimicrobial prophylaxis (AMP) is to protect the surgical wound from contamination by normal bacterial flora. AMP should be based on penicillin with beta-lactamase inhibitors, or first- or second-generation cephalosporins. Broad-spectrum antimicrobials, such as third- and fourth- generation cephalosporins or carbapenems, should be used to treat postoperative infections but not AMP. AMP should be started no less than 30 minutes prior to the start of the operation. AMP should be administered by a single dose or be terminated within 24 hours in cases of transurethral, clean, or clean-contaminated surgery, and within 2 days in cases of bowl (contaminated) surgery. These guidelines are applicable preoperatively only for non-infected, low-risk patients. The risk of patients for infection should be evaluated preoperatively, such as with a urine culture test. In cases with preoperative infection or bacteriuria that can cause an SSI or urinary tract infection following surgery, patients must receive adequate preoperative treatment based on their individual situation.
Yusuke Kinugasa,Takashi Arakawa,Hiroshi Abe,Jose Francisco Rodríguez-Vázquez,Gen Murakami,Kenichi Sugihara 연세대학교의과대학 2013 Yonsei medical journal Vol.54 No.3
Purpose: It is still unclear whether the longitudinal anal muscles or conjoint longitudinal coats (CLCs) are attached to the vagina, although such an attachment, if present, would appear to make an important contribution to the integrated supportive system of the female pelvic floor. Materials and Methods: Using immunohistochemistry for smooth muscle actin, we examined semiserial frontal sections of 1) eleven female late-stage fetuses at 28-37 weeks of gestation, 2) two female middle-stage fetus (2 specimens at 13 weeks), and, 3) six male fetuses at 12 and 37 weeks as a comparison of the morphology. Results: In late-stage female fetuses, the CLCs consistently (11/11) extended into the subcutaneous tissue along the vaginal vestibule on the anterior side of the external anal sphincter. Lateral to the CLCs, the external anal sphincter also extended anteriorly toward the vaginal side walls. The anterior part of the CLCs originated from the perimysium of the levator ani muscle without any contribution of the rectal longitudinal muscle layer. However, in 2 female middle-stage fetuses, smooth muscles along the vestibulum extended superiorly toward the levetor ani sling. In male fetuses, the CLCs were separated from another subcutaneous smooth muscle along the scrotal raphe (posterior parts of the dartos layer) by fatty tissue. Conclusion: In terms of topographical anatomy, the female anterior CLCs are likely to correspond to the lateral extension of the perineal body (a bulky subcutaneous smooth muscle mass present in adult women), supporting the vaginal vestibule by transmission of force from the levator ani.
Octave-spanning Comb with a Wide Frequency Interval of Molecular Rotational Raman Transition
Kazumichi Yoshii,Kentaro Shiraga,Masaki Arakawa,Hiroshi Aoki,Masayuki Katsuragawa,Feng-Lei Hong 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.41
We present a method to generate an octave-spanning Raman comb with absolute-frequency control by locking two laser frequencies for driving the Raman comb to an optical-frequency-comb stabilized to the optical frequency standard. The carrier-envelope-offset frequencies of this Raman comb are measured by the f-2f self-referencing method. The shift of the carrier-envelope-phase of the produced pulse train is stabilized to a zero-condition by manipulating the relative frequency of driving-laser frequencies.
Central Nervous System Drug Evaluation Using Positron Emission Tomography
Mizuho Sekine,Jun Maeda,Hitoshi Shimada,Tsuyoshi Nogami,Ryosuke Arakawa,Harumasa Takano,Makoto Higuchi,Hiroshi Ito,Yoshiro Okubo,Tetsuya Suhara 대한정신약물학회 2011 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.9 No.1
In conventional pharmacological research in the field of mental disorders, pharmacological effect and dose have been estimated by ethological approach and in vitro data of affinity to the site of action. In addition, the frequency of administration has been estimated from drug kinetics in blood. However, there is a problem regarding an objective index of drug effects in the living body. Furthermore, the possibility that the concentration of drug in blood does not necessarily reflect the drug kinetics in target organs has been pointed out. Positron emission tomography (PET) techniques have made progress for more than 20 years,and made it possible to measure the distribution and kinetics of small molecule components in living brain. In this article, we focused on rational drug dosing using receptor occupancy and proof-of-concept of drugs in the drug development process using PET.