Transversus Abdominis Muscle Anatomy

Here we can see the transversus abdominis from an anterior view.

Here we can see the transversus abdominis from an anterolateral view.

Here we can see the transversus abdominis from a lateral view.

Here we can see the transversus abdominis from a posterior view.

This image distinctly highlights the transversus abdominis in red, amidst the other muscles of the body. Other abdominal muscles are selectively concealed to allow clear viewing of the transversus abdominis, considering its position as the deepest of all abdominal muscles.

This image again showcases the transversus abdominis, highlighted in red, but this time it is partially obscured by the internal oblique muscle. While other abdominal muscles are still hidden, this image shows the transversus abdominis relative to the internal oblique muscle.

Here we can see the transversus abdominis muscle with the aponeurosis attached and connecting to the linea alba.

Here we can see the first origin point of the transversus abdominis on the 7th to 10th rib’s costal cartilages highlighted in red.

Next, we can see the final two rib origin points of the transversus abdominis on the posterior of the skeleton. Located on ribs 11 and 12 and highlighted in red.

Moving inferiorly towards the pelvis we can see another origin point at the inguinal ligament highlighted in red.

Finally, our last point of origin is the thoracolumbar fascia highlighted in green in the lower back region.

The first point of insertion of the transversus abdominis muscle is the linea alba which you can see highlighted in blue.

The last points of insertion are on the pubic crest and pectineal line (via conjoint tendon). The points of insertion are highlighted in blue.

Here we can see the intercostal nerves highlighted in red. These nerves are an innervation of the transversus abdominis muscle.

Here we can see the subcostal nerve highlighted in red. The subcostal nerve innervates the transversus abdominis muscle.

Here we can see the iliohypogastric and ilioinguinal nerves labelled. These nerves innervate the transversus abdominis muscle. The iliohypogastric and ilioinguinal nerves originate from the lumbar plexus, with both nerves arising primarily from the anterior rami of the first lumbar nerve (L1). Sometimes, the iliohypogastric nerve also receives contributions from the twelfth thoracic nerve (T12). The iliohypogastric nerve has two branches, the lateral cutaneous branch and the anterior cutaneous branch. The anterior branch in this picture is the one going around to the front of the body.