| Front | Transversus abdominus |
|---|---|
| Back | Structure: bilateral muscles attached to lower ribs and costal cartilages, iliac crest, and inguinal ligament. Inserts medially into linea alba via an aponeurosis and rectus sheath Fiber direction: mostly horizontal, but lower fibers arch downwards (like internal abdominal oblique) Innervation: ventral rami of abdominal wall nerves (T6-L1), which include a) intercostal nerves (T6-11) b) subcostal nerve (T12) c) ilioinguinal nerve (L1) Function: 1. bilateral contraction for flexion (ex: sit-ups) 2. unilateral contraction for lateral bending and rotation 3. Compression of abdominal cavity to increase pressure (for vomitting, defecating, coughing, giving birth, etc.) |
Tags: muscles
Learn with these flashcards. Click next, previous, or up to navigate to more flashcards for this subject.
Next card: Rectus abdominal abdominus structure bilateral muscles attached superiorly
Previous card: Abdominal bilateral nerves contraction internal oblique structure muscles
Up to card list: Gross Anatomy