What does the pectinate line do?
As discussed above, the pectinate line divides the anal canal into two parts – which have a different arterial supply, venous drainage, innervation and lymphatic drainage. Anastomosing branches from the middle rectal artery.
How deep is the pectinate line?
The most inferior location is 2.5 cm caudal to the inferior pubic ramus, and the most superior location is the superior aspect of the femoral head (Fig. 25-2).
What is below pectinate line?
Below the Pectinate Line The middle rectal artery is a branch of the internal iliac artery, while the inferior rectal artery is a branch of the internal pudendal artery. The lymphatic drainage below the pectinate line is to the superficial inguinal lymph nodes.
Why is dentate line important?
The dentate line is the most important landmark for understanding the epithelium of the anal canal. The dentate line is located one third below the entire surgical anal canal.
Can you feel the dentate line?
There is a “toothed” or jagged line that corresponds to columns also known as the dentate line, which can be seen with the naked eye and is just below the squamocolumnar junction or towards the outside.
How long is the dentate line?
The average length of the anatomic anal canal (dentate line to anal verge) was 2.1 cm (range 1.0-3.8 cm). In men, the average length was 2.2 cm (range 1.4-3.8 cm), whereas in women the average length was 2.0 cm (range 1.0-3.2 cm) (P less than . 01).
How far up is the dentate line?
The median distance between the dentate line and the anal verge was 2.0 cm. The distances of each rectal valve (proximal to distal) to the anal verge and dentate line were 11.4 ± 2.0 cm, 8.6 ± 2.0 cm, 6.0 ± 1.7 cm and 9.1 ± 1.6 cm, 6.3 ± 1.6 cm, 3.7 ± 1.5 cm, respectively.
Why the pectinate line is called watershed line?
The pectinate line is called the watershed line because it separates the two entirely different parts of the anal canal (in terms of development, nerve supply, blood supply and lymphatic drainage).
Where is the Pectineal line?
pubic bone
The pectineal line of the pubis (also pecten pubis) is a ridge on the superior ramus of the pubic bone. It forms part of the pelvic brim. Lying across from the pectineal line are fibers of the pectineal ligament, and the proximal origin of the pectineus muscle.
Is pectineal line same as spiral line?
While the spiral line, which provides the origin for the vastus medialis muscle, runs medially towards the lesser trochanter, the pectineal line, marking the insertion of the pectineus muscle, is located lateral and superior to it [15].
What attaches on the pectineal line?
On the posterior surface of the femur, the intermediate ridge or pectineal line is continued to the base of the lesser trochanter and gives attachment to the pectineus muscle.