For Saturday, here is a body part. The navel, aka umbilicus, aka omphalos.
Omphalos
(||Om"pha*los) n. [L., fr. Gr. .] (Anat.) The navel.

Now, how about one of you mythology scholars telling us how "omphalos" is
related to the Queen who enjoyed humiliating Hercules.

A variant term for navelgazer:Omphalopsychite
(Om`pha*lop"sy*chite) n. [Omphalo- + Gr. breath, spirit, soul: cf. F. omphalopsyque.] (Eccl.Hist.) A name of the
Hesychasts, from their habit of gazing upon the navel.

Cutting the silver cord:omphalotomy

Bible

Ecclesiastes 16:6-7

[6] Remember him--before the silver cord is severed, or the golden bowl is broken; before the pitcher is shattered at
the spring, or the wheel broken at the well,

"Delphi, the Navel of the World, the site chosen
for his temple by Apollo himself 3,000 years ago

Omphale was a queen of Lydia. Some legends state that Omphale became a mistress of Heracles. Omphale & Heracles had a son Agelaos. According to Graves the Omphale's name suggests a prophetic navel shrine like that at Delphi.

In surgery, an incision across the midline from navel to symphysis pubis is avoided because of:

28.5 Disorders of the omphalo-mesenteric duct (Meckel's
diverticulum)

In fetal life the intestinal tract and the yolk sac are joined by the omphalo-mesenteric or vitelline duct. Remnants of this may
persist and present as: (1) A persistent discharge from the umbilicus which is occasionally faecal. (2) Gastro-intestinal bleeding
from ectopic gastric mucosa in Meckel's diverticulum. (3) Gut obstruction caused by gut twisting around a persistent vitelline duct,
as described in Section 28.3. You may occasionally have to resect and anastomose gut in connection with any of these three, or,
rarely, with the other abnormalities in Fig. 28-4.

And patent urachus
Surgery to close a defect of the bladder (patent urachus). The urachus is a tube
that connects the bladder to the umbilicus during fetal development. After birth,
the urachus normally closes and becomes a ligament. When the urachus fails to
close after birth, the tube remains open (patent), leaving an abnormal opening
(patent urachus) between the bladder and the umbilicus and increasing the
possibility of introducing bacteria and infection into the bladder.