RECTUM & ANAL CANAL

RECTUM & ANAL CANAL

sigmoid colon connect with rectum at the rectosigmoid junction.

Rectum connect with anal canal at the anorectal junction (ring).

• The rectum is the most distal segment of the large intestine, and has an important role as a temporary store of feces.

• The rectum begins at the level of the 3rd sacrum vertebra (S3).

• From lateral view, rectum is marked by two major flexures: (i) Sacral flexure & (ii) Anorectal flexure

Lateral view (MALE)

• 3 main organs directly located anterior to the rectum are:

• SEMINAL VESICLE

• PROSTATE GLAND

• URINARY BLADDER

Lateral view (FEMALE)

• 2 main organs directly located anterior to the rectum are:

• VAGINA CANAL

• UTERUS

• 
  

Multiple Choice

The rectum started at the level of ______ vertebra.

• S1

• S2

• S3

• S4

• S5

Multiple Select

Choose 3 organs that located at the front of rectum in male? (select 3 answers and submit)

• Uterus

• Seminal Vesicle

• Urinary bladder

• Prostate gland

• vaginal canal

• Anal canal role in defecation.

• Anal canal is surrounded by internal and external anal sphincters, which play a crucial role in the maintenance of fecal continence (flowing or feces)

An irregular circle – known as the pectinate line (or dentate line). This line divides the anal canal into upper and lower parts

Anorectal angle

• The angle between the straight line of rectum axis & the straight line of anal canal axis is known as ANORECTAL ANGLE.

• The anorectal angle differ when people at (i) rest, (ii) defecation, (iii) sitting and (iv) squatting.

Multiple Choice

The main function of rectum is to temporarily store feces, whereas the function of anal canal is to control the process of _______

• micturition

• defecation

• digestion

• water absorption

Multiple Choice

The angle created by a line drawn through the central axis of the anal canal and a line drawn through either the central axis of the distal rectum is called _______ angle.

• pectinate

• rectal ampulla

• anorectal

• rectosigmoid

Multiple Choice

Defecation will _______ the anorectal angle as compared to during the rest.

• increase

• decrease