Digestive System Ii
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The Anatomy of the Rectum and Anal Canal
BASIC SCIENCE identify the rectosigmoid junction with confidence at operation. The anatomy of the rectum The rectosigmoid junction usually lies approximately 6 cm below the level of the sacral promontory. Approached from the distal and anal canal end, however, as when performing a rigid or flexible sigmoid- oscopy, the rectosigmoid junction is seen to be 14e18 cm from Vishy Mahadevan the anal verge, and 18 cm is usually taken as the measurement for audit purposes. The rectum in the adult measures 10e14 cm in length. Abstract Diseases of the rectum and anal canal, both benign and malignant, Relationship of the peritoneum to the rectum account for a very large part of colorectal surgical practice in the UK. Unlike the transverse colon and sigmoid colon, the rectum lacks This article emphasizes the surgically-relevant aspects of the anatomy a mesentery (Figure 1). The posterior aspect of the rectum is thus of the rectum and anal canal. entirely free of a peritoneal covering. In this respect the rectum resembles the ascending and descending segments of the colon, Keywords Anal cushions; inferior hypogastric plexus; internal and and all of these segments may be therefore be spoken of as external anal sphincters; lymphatic drainage of rectum and anal canal; retroperitoneal. The precise relationship of the peritoneum to the mesorectum; perineum; rectal blood supply rectum is as follows: the upper third of the rectum is covered by peritoneum on its anterior and lateral surfaces; the middle third of the rectum is covered by peritoneum only on its anterior 1 The rectum is the direct continuation of the sigmoid colon and surface while the lower third of the rectum is below the level of commences in front of the body of the third sacral vertebra. -
Rectum & Anal Canal
Rectum & Anal canal Dr Brijendra Singh Prof & Head Anatomy AIIMS Rishikesh 27/04/2019 EMBRYOLOGICAL basis – Nerve Supply of GUT •Origin: Foregut (endoderm) •Nerve supply: (Autonomic): Sympathetic Greater Splanchnic T5-T9 + Vagus – Coeliac trunk T12 •Origin: Midgut (endoderm) •Nerve supply: (Autonomic): Sympathetic Lesser Splanchnic T10 T11 + Vagus – Sup Mesenteric artery L1 •Origin: Hindgut (endoderm) •Nerve supply: (Autonomic): Sympathetic Least Splanchnic T12 L1 + Hypogastric S2S3S4 – Inferior Mesenteric Artery L3 •Origin :lower 1/3 of anal canal – ectoderm •Nerve Supply: Somatic (inferior rectal Nerves) Rectum •Straight – quadrupeds •Curved anteriorly – puborectalis levator ani •Part of large intestine – continuation of sigmoid colon , but lacks Mesentery , taeniae coli , sacculations & haustrations & appendices epiploicae. •Starts – S3 anorectal junction – ant to tip of coccyx – apex of prostate •12 cms – 5 inches - transverse slit •Ampulla – lower part Development •Mucosa above Houstons 3rd valve endoderm pre allantoic part of hind gut. •Mucosa below Houstons 3rd valve upto anal valves – endoderm from dorsal part of endodermal cloaca. •Musculature of rectum is derived from splanchnic mesoderm surrounding cloaca. •Proctodeum the surface ectoderm – muco- cutaneous junction. •Anal membrane disappears – and rectum communicates outside through anal canal. Location & peritoneal relations of Rectum S3 1 inch infront of coccyx Rectum • Beginning: continuation of sigmoid colon at S3. • Termination: continues as anal canal, • one inch below -
48 Anal Canal
Anal Canal The rectum is a relatively straight continuation of the colon about 12 cm in length. Three internal transverse rectal valves (of Houston) occur in the distal rectum. Infoldings of the submucosa and the inner circular layer of the muscularis externa form these permanent sickle- shaped structures. The valves function in the separation of flatus from the developing fecal mass. The mucosa of the first part of the rectum is similar to that of the colon except that the intestinal glands are slightly longer and the lining epithelium is composed primarily of goblet cells. The distal 2 to 3 cm of the rectum forms the anal canal, which ends at the anus. Immediately proximal to the pectinate line, the intestinal glands become shorter and then disappear. At the pectinate line, the simple columnar intestinal epithelium makes an abrupt transition to noncornified stratified squamous epithelium. After a short transition, the noncornified stratified squamous epithelium becomes continuous with the keratinized stratified squamous epithelium of the skin at the level of the external anal sphincter. Beneath the epithelium of this region are simple tubular apocrine sweat glands, the circumanal glands. Proximal to the pectinate line, the mucosa of the anal canal forms large longitudinal folds called rectal columns (of Morgagni). The distal ends of the rectal columns are united by transverse mucosal folds, the anal valves. The recess above each valve forms a small anal sinus. It is at the level of the anal valves that the muscularis mucosae becomes discontinuous and then disappears. The submucosa of the anal canal contains numerous veins that form a large hemorrhoidal plexus. -
The Digestive System Overview of the Digestive System • Organs Are Divided Into Two Groups the Alimentary Canal and Accessory
C H A P T E R 23 The Digestive System 1 Overview of the Digestive System • Organs are divided into two groups • The alimentary canal • Mouth, pharynx, and esophagus • Stomach, small intestine, and large intestine (colon) • Accessory digestive organs • Teeth and tongue • Gallbladder, salivary glands, liver, and pancreas 2 The Alimentary Canal and Accessory Digestive Organs Mouth (oral cavity) Parotid gland Tongue Sublingual gland Salivary glands Submandibular gland Esophagus Pharynx Stomach Pancreas (Spleen) Liver Gallbladder Transverse colon Duodenum Descending colon Small intestine Jejunum Ascending colon Ileum Cecum Large intestine Sigmoid colon Rectum Anus Vermiform appendix Anal canal Figure 23.1 3 1 Digestive Processes • Ingestion • Propulsion • Mechanical digestion • Chemical digestion • Absorption • Defecation 4 Peristalsis • Major means of propulsion • Adjacent segments of the alimentary canal relax and contract Figure 23.3a 5 Segmentation • Rhythmic local contractions of the intestine • Mixes food with digestive juices Figure 23.3b 6 2 The Peritoneal Cavity and Peritoneum • Peritoneum – a serous membrane • Visceral peritoneum – surrounds digestive organs • Parietal peritoneum – lines the body wall • Peritoneal cavity – a slit-like potential space Falciform Anterior Visceral ligament peritoneum Liver Peritoneal cavity (with serous fluid) Stomach Parietal peritoneum Kidney (retroperitoneal) Wall of Posterior body trunk Figure 23.5 7 Mesenteries • Lesser omentum attaches to lesser curvature of stomach Liver Gallbladder Lesser omentum -
Progress Report Anal Continence
Gut: first published as 10.1136/gut.12.10.844 on 1 October 1971. Downloaded from Gut, 1971, 12, 844-852 Progress report Anal continence Anal continence depends on an adaptable barrier formed at the ano-rectal junction and in the anal canal by a combination of forces. These are due in part to the configuration of the region and in part to the action of muscles. The forces are activated in response to sensory information obtained from the rectum and the anal canal. In order to understand some of the concepts of the mechanism of anal continence, some of the features of the anatomy and physiology of the region will be discussed. Anatomy (Fig. 1) The lumen of the rectum terminates at the pelvic floor and is continued, downwards and posteriorly, as the anal canal, passing through the levator ani muscle sheet and surrounded by the internal and external anal sphincters. The anal canal is 2.5 to 5 cm in length and 3 cm in diameter when distended. The axis of the rectum forms almost a right angle (average 820) with the axis of the anal canal. It has been established by radiological studies that the anal canal is an antero-posterior slit in the resting state.' The former concept of http://gut.bmj.com/ the anal canal being surrounded successively craniocaudally by the internal anal sphincter and then the external anal sphincter has been replaced by the knowledge that the two muscles overlap to a considerable extent with the external sphincter wrapped round the internal sphincter2'3. -
Normal Gross and Histologic Features of the Gastrointestinal Tract
NORMAL GROSS AND HISTOLOGIC 1 FEATURES OF THE GASTROINTESTINAL TRACT THE NORMAL ESOPHAGUS left gastric, left phrenic, and left hepatic accessory arteries. Veins in the proximal and mid esopha- Anatomy gus drain into the systemic circulation, whereas Gross Anatomy. The adult esophagus is a the short gastric and left gastric veins of the muscular tube measuring approximately 25 cm portal system drain the distal esophagus. Linear and extending from the lower border of the cri- arrays of large caliber veins are unique to the distal coid cartilage to the gastroesophageal junction. esophagus and can be a helpful clue to the site of It lies posterior to the trachea and left atrium a biopsy when extensive cardiac-type mucosa is in the mediastinum but deviates slightly to the present near the gastroesophageal junction (4). left before descending to the diaphragm, where Lymphatic vessels are present in all layers of the it traverses the hiatus and enters the abdomen. esophagus. They drain to paratracheal and deep The subdiaphragmatic esophagus lies against cervical lymph nodes in the cervical esophagus, the posterior surface of the left hepatic lobe (1). bronchial and posterior mediastinal lymph nodes The International Classification of Diseases in the thoracic esophagus, and left gastric lymph and the American Joint Commission on Cancer nodes in the abdominal esophagus. divide the esophagus into upper, middle, and lower thirds, whereas endoscopists measure distance to points in the esophagus relative to the incisors (2). The esophagus begins 15 cm from the incisors and extends 40 cm from the incisors in the average adult (3). The upper and lower esophageal sphincters represent areas of increased resting tone but lack anatomic landmarks; they are located 15 to 18 cm from the incisors and slightly proximal to the gastroesophageal junction, respectively. -
Pathology of Anal Cancer
Pathology of Anal Cancer a b Paulo M. Hoff, MD, PhD , Renata Coudry, MD, PhD , a, Camila Motta Venchiarutti Moniz, MD * KEYWORDS Anal cancer Anal squamous intraepithelial neoplasia Squamous cell carcinoma Human papilloma virus (HPV) Molecular KEY POINTS Anal cancer is an uncommon tumor, squamous cell carcinoma (SCC) being the most frequent histology corresponding to 80% of all cases. Human papilloma virus (HPV) infection plays a key role in anal cancer development, en- coding at least three oncoproteins with stimulatory properties. SCC expresses CK5/6, CK 13/19, and p63. P16 is a surrogate marker for the presence of HPV genome in tumor cells. INTRODUCTION Anal cancer accounts for approximately 2.4% of gastrointestinal malignancies.1 Although anal cancer is a rare tumor, its frequency is increasing, especially in high- risk groups.2 Tumors in this location are generally classified as anal canal or anal margin. Squamous cell carcinoma (SCC) is the predominant type of tumor and shares many features with cervical cancer. Oncogenic human papilloma virus (HPV) infection plays a major role in both tumors.3 HIV infection is associated with a higher frequency of HPV-associated premalignant lesions and invasive tumors.4 Normal Anatomy of the Anus The anal canal is the terminal part of the large intestine and is slightly longer in male than in female patients. It measures approximately 4 cm and extends from the rectal ampulla (pelvic floor level) to the anal verge, which is defined as the outer open- ing of the gastrointestinal tract. The anal verge is at the level of the squamous- mucocutaneous junction with the perianal skin.5,6 The authors have nothing to disclose. -
Nomina Histologica Veterinaria, First Edition
NOMINA HISTOLOGICA VETERINARIA Submitted by the International Committee on Veterinary Histological Nomenclature (ICVHN) to the World Association of Veterinary Anatomists Published on the website of the World Association of Veterinary Anatomists www.wava-amav.org 2017 CONTENTS Introduction i Principles of term construction in N.H.V. iii Cytologia – Cytology 1 Textus epithelialis – Epithelial tissue 10 Textus connectivus – Connective tissue 13 Sanguis et Lympha – Blood and Lymph 17 Textus muscularis – Muscle tissue 19 Textus nervosus – Nerve tissue 20 Splanchnologia – Viscera 23 Systema digestorium – Digestive system 24 Systema respiratorium – Respiratory system 32 Systema urinarium – Urinary system 35 Organa genitalia masculina – Male genital system 38 Organa genitalia feminina – Female genital system 42 Systema endocrinum – Endocrine system 45 Systema cardiovasculare et lymphaticum [Angiologia] – Cardiovascular and lymphatic system 47 Systema nervosum – Nervous system 52 Receptores sensorii et Organa sensuum – Sensory receptors and Sense organs 58 Integumentum – Integument 64 INTRODUCTION The preparations leading to the publication of the present first edition of the Nomina Histologica Veterinaria has a long history spanning more than 50 years. Under the auspices of the World Association of Veterinary Anatomists (W.A.V.A.), the International Committee on Veterinary Anatomical Nomenclature (I.C.V.A.N.) appointed in Giessen, 1965, a Subcommittee on Histology and Embryology which started a working relation with the Subcommittee on Histology of the former International Anatomical Nomenclature Committee. In Mexico City, 1971, this Subcommittee presented a document entitled Nomina Histologica Veterinaria: A Working Draft as a basis for the continued work of the newly-appointed Subcommittee on Histological Nomenclature. This resulted in the editing of the Nomina Histologica Veterinaria: A Working Draft II (Toulouse, 1974), followed by preparations for publication of a Nomina Histologica Veterinaria. -
Anatomy of Anal Canal
Anatomy of Anal Canal Dr Garima Sehgal Associate Professor Department of Anatomy King George’s Medical University, UP, Lucknow DISCLAIMER: • The presentation includes images which are either hand drawn or have been taken from google images or books. • They are being used in the presentation only for educational purpose. • The author of the presentation claims no personal ownership over images taken from books or google images. • However, the hand drawn images are the creation of the author of the presentation Subdivisions of the perineum • Transverse line joining the anterior part of ischial tuberosities divides perineum into: 1. Urogenital region / triangle- ANTERIORLY 2. Anal region / triangle - POSTERIORLY Anal canal may be affected by many conditions that are not so rare, not necessarily serious and endangering to life but on the contrary very INCAPACITATING Haemorrhoids Anal fistula Anal fissure Perianal abscess Learning objectives At the end of this teaching session on anatomy of Anal canal all the MBBS 1st Year students must be able to correctly: • Describe the location, extent and dimensions of the anal canal • Enumerate the relations of the anal canal • Enumerate the subdivisions of anal canal • Describe & Diagrammatically display the special features on the interior of the anal canal • Discuss the importance of pectinate / dentate line • Write a short note on the arterial supply, venous drainage, nerve supply & lymphatic drainage • Write a short note on the sphincters of the anal canal • Describe the anatomical basis of internal -
Aandp2ch25lecture.Pdf
Chapter 25 Lecture Outline See separate PowerPoint slides for all figures and tables pre- inserted into PowerPoint without notes. Copyright © McGraw-Hill Education. Permission required for reproduction or display. 1 Introduction • Most nutrients we eat cannot be used in existing form – Must be broken down into smaller components before body can make use of them • Digestive system—acts as a disassembly line – To break down nutrients into forms that can be used by the body – To absorb them so they can be distributed to the tissues • Gastroenterology—the study of the digestive tract and the diagnosis and treatment of its disorders 25-2 General Anatomy and Digestive Processes • Expected Learning Outcomes – List the functions and major physiological processes of the digestive system. – Distinguish between mechanical and chemical digestion. – Describe the basic chemical process underlying all chemical digestion, and name the major substrates and products of this process. 25-3 General Anatomy and Digestive Processes (Continued) – List the regions of the digestive tract and the accessory organs of the digestive system. – Identify the layers of the digestive tract and describe its relationship to the peritoneum. – Describe the general neural and chemical controls over digestive function. 25-4 Digestive Function • Digestive system—organ system that processes food, extracts nutrients, and eliminates residue • Five stages of digestion – Ingestion: selective intake of food – Digestion: mechanical and chemical breakdown of food into a form usable by -
SPLANCHNOLOGY Part I. Digestive System (Пищеварительная Система)
КАЗАНСКИЙ ФЕДЕРАЛЬНЫЙ УНИВЕРСИТЕТ ИНСТИТУТ ФУНДАМЕНТАЛЬНОЙ МЕДИЦИНЫ И БИОЛОГИИ Кафедра морфологии и общей патологии А.А. Гумерова, С.Р. Абдулхаков, А.П. Киясов, Д.И. Андреева SPLANCHNOLOGY Part I. Digestive system (Пищеварительная система) Учебно-методическое пособие на английском языке Казань – 2015 УДК 611.71 ББК 28.706 Принято на заседании кафедры морфологии и общей патологии Протокол № 9 от 18 апреля 2015 года Рецензенты: кандидат медицинских наук, доцент каф. топографической анатомии и оперативной хирургии КГМУ С.А. Обыдённов; кандидат медицинских наук, доцент каф. топографической анатомии и оперативной хирургии КГМУ Ф.Г. Биккинеев Гумерова А.А., Абдулхаков С.Р., Киясов А.П., Андреева Д.И. SPLANCHNOLOGY. Part I. Digestive system / А.А. Гумерова, С.Р. Абдулхаков, А.П. Киясов, Д.И. Андреева. – Казань: Казан. ун-т, 2015. – 53 с. Учебно-методическое пособие адресовано студентам первого курса медицинских специальностей, проходящим обучение на английском языке, для самостоятельного изучения нормальной анатомии человека. Пособие посвящено Спланхнологии (науке о внутренних органах). В данной первой части пособия рассматривается анатомическое строение и функции системы в целом и отдельных органов, таких как полость рта, пищевод, желудок, тонкий и толстый кишечник, железы пищеварительной системы, а также расположение органов в брюшной полости и их взаимоотношения с брюшиной. Учебно-методическое пособие содержит в себе необходимые термины и объём информации, достаточный для сдачи модуля по данному разделу. © Гумерова А.А., Абдулхаков С.Р., Киясов А.П., Андреева Д.И., 2015 © Казанский университет, 2015 2 THE ALIMENTARY SYSTEM (systema alimentarium/digestorium) The alimentary system is a complex of organs with the function of mechanical and chemical treatment of food, absorption of the treated nutrients, and excretion of undigested remnants. -
Ta2, Part Iii
TERMINOLOGIA ANATOMICA Second Edition (2.06) International Anatomical Terminology FIPAT The Federative International Programme for Anatomical Terminology A programme of the International Federation of Associations of Anatomists (IFAA) TA2, PART III Contents: Systemata visceralia Visceral systems Caput V: Systema digestorium Chapter 5: Digestive system Caput VI: Systema respiratorium Chapter 6: Respiratory system Caput VII: Cavitas thoracis Chapter 7: Thoracic cavity Caput VIII: Systema urinarium Chapter 8: Urinary system Caput IX: Systemata genitalia Chapter 9: Genital systems Caput X: Cavitas abdominopelvica Chapter 10: Abdominopelvic cavity Bibliographic Reference Citation: FIPAT. Terminologia Anatomica. 2nd ed. FIPAT.library.dal.ca. Federative International Programme for Anatomical Terminology, 2019 Published pending approval by the General Assembly at the next Congress of IFAA (2019) Creative Commons License: The publication of Terminologia Anatomica is under a Creative Commons Attribution-NoDerivatives 4.0 International (CC BY-ND 4.0) license The individual terms in this terminology are within the public domain. Statements about terms being part of this international standard terminology should use the above bibliographic reference to cite this terminology. The unaltered PDF files of this terminology may be freely copied and distributed by users. IFAA member societies are authorized to publish translations of this terminology. Authors of other works that might be considered derivative should write to the Chair of FIPAT for permission to publish a derivative work. Caput V: SYSTEMA DIGESTORIUM Chapter 5: DIGESTIVE SYSTEM Latin term Latin synonym UK English US English English synonym Other 2772 Systemata visceralia Visceral systems Visceral systems Splanchnologia 2773 Systema digestorium Systema alimentarium Digestive system Digestive system Alimentary system Apparatus digestorius; Gastrointestinal system 2774 Stoma Ostium orale; Os Mouth Mouth 2775 Labia oris Lips Lips See Anatomia generalis (Ch.