Transversus abdominis muscle

Beginning:

• cartilage 7.–12. ribs;
• edges of thoracolumbar fascia;
• iliac crest;
• inguinal ligament.

Insertion:

• linea alba (through the aponeurosis);
• the lower edge merges with the aponeurosis of musculus obliquus internus and thus forms the falx inguinalis;
• the caudal edge of the aponeurosis passes into the ligamentum interfoveolare (part of the inguinal canal).

Innervation:

• intercostal nerves (7.–11.);
• subcostal nerve;
• iliohypogastric nerve;
• ilioinguinal nerve;
• genitofemoral nerve.

Function:

• participates in the abdominal press;
• expiratory accessory muscle;
• regulation of tension in the inguinal canal.

Formations on the obluquus externus abdominis muscle:

• aponeurosis musculi transversi: the tendon into which the muscle passes towards the rectus abdominis muscle.

Links

References

• ČIHÁK, Radomír. Anatomy 1. 2. edition. Prague : Grada, 2001. pp. 497. ISBN 80-7169-970-5.