Internal Abdominal Oblique Flashcards
Origin
- Thoracolumbar fascia
- Anterior 2/3 of iliac crest intermediate lip
- Lateral 2/3 of Inguinal upper concave surface
Fibers direction
Upwards, forwards, and medial
Insertion
- By fleshy fibers into lower 3 ribs lower borders
- By aponeurosis into 7th, 8th, and 9th costal cartilages, xiphoid process, linea alba, symphysis pubis, pubic crest, and perineal line
Aponeurosis
Splits at rectus abdominis lateral border into anterior and posterior laminae which extend anterior and posterior to rectus abdominis reaching linea alba
Lower fibers relation to spermatic cord
Triple relation:
1. 1st anterior to cord forming lateral 1/2 of Inguinal canal anterior wall
2. Arch above cord forming Inguinal canal roof
3. The conjoint tendon lies behind cord forming medial 1/2 of Inguinal canal posterior wall
Conjoint tendon (Falx inguinalis) shape
Sickle shaped
Conjoint tendon formed of
- Internal abdominal oblique aponeurosis
- Transversus abdominis aponeurosis
Conjoint tendon base
Attached to pubic crest and Pectineal line
Conjoint tendon nerve supply
Ilio-Inguinal nerve
Conjoint tendon site
Lies in front of rectus abdominis and behind spermatic cord or round ligament of uterus forming medial 1/2 of Inguinal canal posterior wall
Cremasteric muscle origin
From middle of Inguinal ligament upper concave surface as an extension of internal oblique origin
Cremasteric muscle insertion
After forming U-shaped loops around spermatic cord and testis, it is inserted into pubic tubercle
Cremasteric muscle nerve supply
Cremasteric nerve (genital branch of genitofemoral nerve)
Cremasteric muscle action
Supports testis weight and elevates testis during ejaculation or increased intra-abdominal pressure
Cremasteric reflex
Stroking thigh medial side results in Cremasteric muscle contraction and testis elevation
