Deep inguinal ring
|Deep inguinal ring|
|Latin||Anulus inguinalis profundus|
The deep inguinal ring (internal or deep abdominal ring, abdominal inguinal ring, internal inguinal ring) is the entrance to the inguinal canal.
The surface marking of the deep inguinal ring is classically described as immediately above the midpoint of the inguinal ligament (midway between the anterior superior iliac spine and the pubic tubercle).
However, the surface anatomy of the point is disputed. In a recent study it was found to be in a region between the mid-inguinal point (situated midway between the anterior superior iliac spine and the pubic symphysis) and the midpoint of the inguinal ligament (i.e. midway between the anterior superior iliac spine and the pubic tubercle). Traditionally, either one of these 2 sites was claimed as its location. However, this claim is based upon the study's dissection of 52 cadavers, and may not reflect the live in vivo anatomy.
It is of an oval form, the long axis of the oval being vertical; it varies in size in different subjects, and is much larger in the male than in the female.
It is bounded, above and laterally, by the arched lower margin of the transversalis fascia; below and medially, by the inferior epigastric vessels.
From its circumference a thin funnel-shaped membrane, the infundibuliform fascia, is continued around the cord and testis, enclosing them in a distinct covering.
- Susan Standring (2004). Gray's Anatomy: The Anatomical Basis of Medicine and Surgery. Churchill-Livingstone. p. 1098. ISBN 0-443-07168-3.
- Koliyadan S, Narayan G, Balasekran P (2004). "Surface marking of the deep inguinal ring". Clin Anat 17 (7): 554–7. doi:10.1002/ca.10257. PMID 15376291.
- Kyung Won, PhD. Chung (2005). Gross Anatomy (Board Review). Hagerstown, MD: Lippincott Williams & Wilkins. p. 198. ISBN 0-7817-5309-0.
- Anatomy figure: 36:01-03 at Human Anatomy Online, SUNY Downstate Medical Center - "The inguinal canal and derivation of the layers of the spermatic cord."
- SUNY Anatomy Image 7362
- -261423027 at GPnotebook
- inguinalregion at The Anatomy Lesson by Wesley Norman (Georgetown University)
- Atlas image: abdo_wall65 at the University of Michigan Health System - "The Coverings of the Inguinal Canal, External & Internal Oblique & Transversus Abdominis Removed"
- The Inguinal Canal and Hernias (includes diagram at burrill.demon.co.uk)