Inferior anal nerves
Encyclopedia
The Inferior rectal nerves (inferior anal nerves, inferior hemorrhoidal nerve) usually branch from the pudendal nerve
but occasionally arises directly from the sacral plexus
; they cross the ischiorectal fossa
along with the inferior hemorrhoidal
vessels, toward the anal canal
and the lower end of the rectum
, and is distributed to the Sphincter ani externus and to the integument around the anus.
Branches of this nerve communicate with the perineal branch of the posterior femoral cutaneous and with the posterior scrotal nerves
at the forepart of the perineum
.
Pudendal nerve
The pudendal nerve is a sensory and somatic nerve in the pelvic region which is a large branch of the sacral plexus that innervates the external genitalia of both sexes, as well as sphincters for the bladder and the rectum...
but occasionally arises directly from the sacral plexus
Sacral plexus
-External links:*...
; they cross the ischiorectal fossa
Ischiorectal fossa
The ischioanal fossa is somewhat prismatic in shape, with its base directed to the surface of the perineum, and its apex at the line of meeting of the obturator and anal fasciae.-Boundaries:...
along with the inferior hemorrhoidal
Inferior hemorrhoidal
Inferior hemorrhoidal can refer to:* Inferior anal nerves* Inferior rectal artery...
vessels, toward the anal canal
Anal canal
The anal canal is the terminal part of the large intestine.It is situated between the rectum and anus, below the level of the pelvic diaphragm. It lies in the anal triangle of perineum in between the right and left ischioanal fossa....
and the lower end of the rectum
Rectum
The rectum is the final straight portion of the large intestine in some mammals, and the gut in others, terminating in the anus. The human rectum is about 12 cm long...
, and is distributed to the Sphincter ani externus and to the integument around the anus.
Branches of this nerve communicate with the perineal branch of the posterior femoral cutaneous and with the posterior scrotal nerves
Posterior scrotal nerves
The posterior scrotal branches or ""posterior labial branches"" are two in number, medial and lateral. They are branches of the perineal nerve, which is itself is a branch of the pudendal nerve...
at the forepart of the perineum
Perineum
In human anatomy, the perineum is a region of the body including the perineal body and surrounding structures...
.
External links
- Details at Oklahoma State - "The Female Perineum: Contents of the Pudendal Canal" - "Inferior view of female perineum, branches of the internal pudendal artery."