3.1.5 The Rectum and Anal Canal Flashcards
What pierces the Pelvic Floor?
The Rectum
At what point does the Rectum pierce the Pelvic Floor?
At the Ano-Rectal Junction
What is connected to the Ano-Rectal Junction, inside the Peritoneum?
The Anal Canal
What is the Arterial Supply to the Superior 1/3 of the Rectum?
The Superior Rectal Artery
What is the Arterial Supply to the Middle 1/3 of the Rectum?
The Middle Rectal Artery
What is the Arterial Supply to the Inferior 1/3 of the Rectum?
The Inferior Rectal Artery
What is the Venous Drainage of the Superior 1/3 of the Rectum?
The Superior Rectal Vein
What is the Venous Drainage of the Middle 1/3 of the Rectum?
The Middle Rectal Vein
What is the Venous Drainage of the Inferior 1/3 of the Rectum?
The Inferior Rectal Vein
What is the Peritonisation of the Superior 1/3 of the Rectum?
It is Retroperitoneal
What is the Peritonisation of the Middle 1/3 of the Rectum?
It is Retroperitoneal
What is the Peritonisation of the Inferior 1/3 of the Rectum?
It is Extraperitoneal (Sub-Peritoneal)
What is the role of the Pelvic Floor in maintaining Faecal Continence?
It maintains the curve of the Ano-Rectal Flexure
Other than the Pelvic Floor, what other structures are involves in Faecal Continence?
- The Internal Anal Sphincter
2. The External Anal Sphincter
What is the Internal Anal Sphincter innervated by?
Autonomic Visceral Nerve Fibres
What is the External Anal Sphincter innervated by?
Somatic Nerve Fibres
Where does the Superior / Middle Rectal Veins drain to?
The Hepatic Portal Venous System
Where does the Inferior Rectal Vein drain to?
The Caval Venous System
Where does the Superior / Middle Rectal Lymphatics drain to?
The Internal Iliac Lymph Nodes
Where does the Inferior Rectal Lymphatics drain to?
The Superficial Inguinal Lymph Nodes
