Editing Inguinal region (section)

== '''Layers at inguinal region''' ==

* '''Skin'''
* '''Subcutaneous     fat'''
** Superficial epigastric vein
** Anterior circumflex iliac      vein (drains to external iliac)
* '''Camper's'''
* '''Scarpa's'''
* '''External     oblique'''
** Entirely aponeurotic below      ASIS - no muscle within inguinal region
** '''Inguinal      ligament'''      ('Poupart's ligament') - in-rolled lower edge of the external oblique      aponeurosis, which runs between ASIS and pubic tubercle, as it rolls      posteriorly to form a shelving edge.
*** Not free-lying - attached       to iliopsoas laterally and fascia lata of the thigh medially
* '''Internal     oblique'''
** Predominately muscular as it      passes through the inguinal region - these fibres are not adequate to      hold sutures
** Fibres directed medially and      inferiorly in the inguinal region
** '''Conjoint      tendon''' is      traditionally described as forming from the fused fibres of IO and TA.      Apparently only present in 5-10% of patients, and is most evident at the      insertion of these muscles on the pubic tubercle. Probably not a useful      term.
** Cremaster arises from IO.
* '''Transversus     abdominis'''
** Muscular fibres laterally in      inguinal region, with aponeurotic fibres starting medial to internal      ring. Therefore, it is durable enough to use for hernia repair in this      region.
** Forms the transversus      abdominus arch (along with IO), which comprises the superior edge of the      internal inguinal ring, and inserts into the superior pubic ramus or      pubic tubercle
** A small number of      aponeurotic fibres continue inferior to internal ring
*** '''Iliopectineal       arch''' - the       strong fascia which lies over the iliopsoas muscle
**** Divides the space deep to        inguinal ligament in two, at a point lateral to the femoral vessels
**** Blends with inguinal        ligament in front and pectineal ligament/pectineus fascia behind - the        only way through the inguinal ligament here is beneath the iliopsoas        fascia
*** '''Iliopubic       tract''' is the       free lower edge of TA/transversalis fascia
**** Forms as a small group of        aponeurotic fibres from TA and some transversalis fascia, which runs        deep and parallel to the inguinal ligament.
**** It courses over the        femoral vessels, defining the anterior border of the femoral sheath,        and eventually inserting at the iliopectineal arch on superior ramus of        pubis, near AIIS.
**** Blends to some extent with        pectineal ligament
**** It also contributes to the        posterior wall of the inguinal canal, along with the anterior and        medial walls of the femoral sheath
**** This is also described in        some sources as 'the internal view of the inguinal ligament'
*** '''Falx       inguinales''' -       the purported fibres of transversus aponeurosis inserting to the pubic       tubercle - not clinically significant.
** In between the iliopubic      tract and transversus abdominis arch, there is a weak spot just covered      by transversalis fascia, which is the site where direct inguinal hernias      develop.
**
* '''Transversalis     fascia'''
** The connective tissue layer      that underlies the abdominal wall musculature
** Although denser than usual      in the inguinal region, it is still relatively thin.
** No clear distinction between      lower border of TA aponeurosis and transversalis fascia
** Nyhus: 'it possess little      intrinsic strength and, by itself, is a worthless material as far as the      construction of a sound hernia repair is concerned.'
*** However, the aponeurosis of       TA certainly is capable of holding sutures, so the distinction is       academic since the two structures are quite blended
**

*

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* '''Preperitoneal     space'''
** Adipose tissue
** Lymphatics
** Blood vessels
*** Inferior epigastric vessels
*** Deep circumflex iliac       vessels - below lateral portion of iliopubic tract
** Nerves
*** Lateral femoral cutaneous       nerve
*** Genitofemoral nerve
** Vas deferens
* '''Peritoneum'''