anal canal


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Related to anal canal: hemorrhoids, appendix, Ischioanal fossa

canal

 [kah-nal´]
a relatively narrow tubular passage or channel.
adductor canal Hunter's canal.
Alcock's canal a tunnel formed by a splitting of the obturator fascia, which encloses the pudendal vessels and nerve.
alimentary canal see alimentary canal.
anal canal the terminal portion of the alimentary canal, from the rectum to the anus.
atrioventricular canal the common canal connecting the primordial atrium and ventricle; it sometimes persists as a congenital anomaly.
birth canal the canal through which the fetus passes in birth.
carotid canal one in the pars petrosa of the temporal bone, transmitting the internal carotid artery to the cranial cavity.
cervical canal the part of the uterine cavity lying within the cervix.
condylar canal an occasional opening in the condylar fossa for transmission of the transverse sinus; called also posterior condyloid foramen.
canal of Corti a space between the outer and inner rods of Corti.
femoral canal the cone-shaped medial part of the femoral sheath lateral to the base of Gimbernat's ligament.
haversian canal any of the anastomosing channels of the haversian system in compact bone, containing blood and lymph vessels, and nerves.
Hunter's canal a fascial tunnel in the middle third of the medial part of the thigh, containing the femoral vessels and saphenous nerve. Called also adductor canal.
hypoglossal canal an opening in the occipital bone, transmitting the hypoglossal nerve and a branch of the posterior meningeal artery; called also anterior condyloid foramen.
infraorbital canal a small canal running obliquely through the floor of the orbit, transmitting the infraorbital vessels and nerve.
inguinal canal the oblique passage in the lower anterior abdominal wall on either side, through which passes the round ligament of the uterus in the female, and the spermatic cord in the male.
medullary canal
optic canal a passage for the optic nerve and ophthalmic artery at the apex of the orbit; called also optic foramen.
pulp canal root canal.
root canal that part of the pulp cavity extending from the pulp chamber to the apical foramen. Called also pulp canal.
sacral canal the continuation of the spinal canal through the sacrum.
Schlemm's canal venous sinus of sclera.
semicircular c's see semicircular canals.
spinal canal (vertebral canal) the canal formed by the series of vertebral foramina together, enclosing the spinal cord and meninges.
Volkmann's c's canals communicating with the haversian canals, for passage of blood vessels through bone.

a·nal ca·nal

[TA]
terminal portion of the alimentary canal; about 4 cm long, beginning at the anorectal junction, where the rectal ampulla abruptly narrows as the alimentary canal pierces the pelvic diaphragm (levator ani), and ending at the anal verge, when the anoderm that lines the lower anal canal changes to hairy perianal skin; surrounded by the internal and external anal sphincters.
Synonym(s): canalis analis [TA]

a·nal ca·nal

(ā'năl kă-nal') [TA]
The terminal portion of the alimentary canal; it extends from the pelvic diaphragm to the anal orifice.
Synonym(s): canalis analis [TA] .
Enlarge picture
ANAL CANAL

anal canal

The 4 cm long terminal section of the large intestine, beginning where the rectum passes downward and forward through the pelvic diaphragm and ending in the anus. The entire length of the anal canal is surrounded by sphincter muscles, and the canal remains closed except during defecation and passage of flatus.
See: illustration
See also: canal

anal canal

The 5 cm-long terminal portion of the intestine that lies immediately below the RECTUM. The anal canal contains two muscular rings (SPHINCTERS) that can close it tightly and seven or more longitudinal pads of MUCOUS MEMBRANE that contain veins and press together to act as an additional sealing mechanism.
References in periodicals archive ?
We cannot exclude a publication bias in our analysis, but we tried to minimize it by selecting only articles that included at least ten patients who performed FDG-PET with biopsy-proven anal canal cancer.
The aim of this paper was to review the characteristics of patients presenting with anal canal carcinoma at GSH.
Examination under general anaesthesia revealed a hard and fixed mass at the level of dentate line protruding down into anal canal and two peri-anal abscesses along with bilateral palpable inguinal lymphadenopathy.
This procedure consists in visualizing the anal canal and perianal area by devices that allow image magnification in order to detect colposcopic lesions.
Both the intestines were then separated and the anal canal was split in the middle to give each child an independent and functional opening to pass stools," said paediatric surgeon Dr Arvind Sabharwal, who led the team of 28 doctors and highly trained nurses.
The standard technique of operation, which included abdominoanal resection of the rectum and segmentary resection of the colon with bringing down of the healthy parts into anal canal, was carried out in case of 1179 (44.9%) patients of the first group with distal or left-sided form of localization of pathological process (Table 1).
Endometriosis of the anal canal: presentation of a case.
For instance, how was HPV transmitted to the perianal region and anal canal of these men."How indeed?
If you have hemorrhoids inside the anal canal (called internal hemorrhoids), you might notice spots of bright-red blood on the toilet paper when you wipe after a bowel movement.
Proctofoam--similar to the medication you tried--may be inserted higher up into the anal canal and used at bedtime after taking a warm bath to increase its absorption.
(1) Abnormalities of the pelvic floor structures which can lead to faecal incontinence are: decreased perception of rectal sensation, decreased anal canal pressures, decreased squeeze pressure of the anal canal, impaired anal sensation, a dropping of the rectum (rectal prolapse), protrusion of the rectum through the vagina (rectocele) and/or general weakness and sagging of the pelvic floor.