Groin

Groin

TERMINOLOGY

Abbreviations

• Anterior superior iliac spine (ASIS)

Definitions

• Junctional region between thigh and trunk

IMAGING ANATOMY

Overview

• Incorporates lower abdominal wall, inguinal canal, femoral triangle, and femoral adductor muscles

Osseous Anatomy

• Pubic bone

Pubic tubercle : Small protuberance, lateral border pubic crest

– Attachment: Inguinal ligament

Superior and inferior rami : Extend from pubis

Pecten : Ridge, posterior aspect of superior pubis

– Origin (O) of pectineus muscle

– Insertion (I) of conjoint tendon (internal oblique and transverse abdominis)

Pubic crest : Superior surface, anterior aspect of pubic body

– O of rectus abdominis muscle

– I of transversus abdominis and external oblique muscles

Pubic symphysis : Cartilaginous joint between pubic bodies

Superior pubic ligament : Laterally extends to pubic tubercles

Anterior Abdominal Wall

• Abdominal wall muscles

Rectus abdominis : Paired midline muscles

– O: Superior pubic ramus, pubic crest

– I: Xiphoid process, costal cartilages 5-7

Linea alba : Aponeurotic junction of rectus abdominis, transverse abdominis, and internal and external oblique muscles

External oblique : Most superficial

– O: Ribs 5-12

– I: Pubic crest, anterior iliac crest, linea alba

– Lower border of aponeurosis contributes to inguinal ligament

Internal oblique : Between external oblique, transversus abdominis

– O: Lateral inguinal ligament, iliac crest, thoracolumbar fascia

– I: Pecten (conjoined tendon), pubic crest, inferior aspect of ribs 10-12, linea alba

– O: Anterior to deep inguinal ring

– I: Lateral to rectus abdominis muscle, posterior and medial to superficial inguinal ring

– Arches over inguinal canal, forming roof

Transversus abdominis : Deepest

– O: Iliac crest, posterior aspect of lateral inguinal ligament, thoracolumbar fascia

– I: Pubic crest, pecten (conjoined tendon), linea alba

– Remains posterior to inguinal canal

Inguinal Ligament

• Thickening inferior border of external oblique aponeurosis
• Attachments: ASIS and pubic tubercle
• Separates lower extremity from pelvis
• Fascia lata attaches to inferior border
• Subinguinal space : Deep to inguinal ligament

Passageway for femoral vessels and nerve, iliopsoas muscle into femoral triangle

External iliac vessels become femoral vessels upon entering this space

Inguinal Canal

• Entrance: Deep inguinal ring

Located midpoint of inguinal ligament

Opening of evaginated transversalis fascia through which spermatic cord/round ligament pass
• Exit: Superficial inguinal ring

Division of external oblique aponeurosis lateral to pubic tubercle
• Contents: Ilioinguinal nerve; male: Spermatic cord; female: Round ligament; associated vessels

Covered by evaginated transversalis fascia

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Apr 9, 2020 | Posted by admin in MUSCULOSKELETAL IMAGING | Comments Off

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