Location of the abdominal muscles

Nov 21, 2022 Source: Cainiu Health

Dr. Lin Yunfei

Introduction

The abdominal muscles are located between the rib cage and the pelvis, forming part of the abdominal wall, and can be divided into anterior-lateral muscles and the posterior quadratus lumborum. The rectus abdominis is a common abdominal muscle situated in the midline of the abdomen, with a strap-like muscle on each side. The surface of this muscle has 3 to 4 tendinous intersections that segment the rectus abdominis. The quadratus lumborum lies in the posterior abdominal wall, on either side of the spine, extending from the iliac crest to the twelfth rib.

The abdominal muscles are located between the rib cage and the pelvis, contributing to the formation of the abdominal wall, and can be divided into two parts: the anterior-lateral muscles and the posterior quadratus lumborum.

1. Anterior-Lateral Muscles

The rectus abdominis is a common abdominal muscle situated at the center of the abdomen. On each side runs a band-like muscle, and on the surface of the rectus abdominis are 3 to 4 tendinous intersections that segment the muscle. Therefore, in individuals with low body fat, the outline of the rectus abdominis—commonly referred to as "six-pack" or "eight-pack abs"—can be clearly seen. Abdominal muscles consist not only of the rectus abdominis but also include the transversus abdominis and the internal and external obliques. These muscles primarily contribute to core stability, maintenance of intra-abdominal pressure, and spinal stability.

2. Posterior Quadratus Lumborum

The quadratus lumborum lies in the posterior abdominal wall, on either side of the spine, extending from the iliac crest to the twelfth rib. Its main function is to enable lateral flexion of the spine.

It is recommended not to focus solely on training the rectus abdominis, but also to strengthen the transversus abdominis and internal/external obliques—for example, through exercises such as planks that target the transversus abdominis and internal oblique muscles.

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How long does it take for abdominal muscles to disappear without training?

Abdominal muscles will gradually diminish after about one month without training. The abdominal muscles are an important component of the body's connective tissue, forming a group of muscles in the human abdomen that help stabilize and protect the internal organs within the abdominal cavity. If exercise is discontinued, the muscles will begin to loosen, decrease in size, and gradually disappear after approximately one month. Therefore, to maintain an aesthetically pleasing physique, consistent physical training is essential.

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Can you continue exercising with a strained abdominal muscle?

In general, if a patient experiences abdominal muscle discomfort, further exercise should be avoided, as continued physical activity may re-stimulate the abdominal muscles, thereby worsening symptoms such as localized pain, swelling, subcutaneous bleeding, and significantly restricted movement. This can impair the patient's recovery and negatively affect overall health. The patient should focus on getting adequate rest and avoid strenuous exercise.

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The Hazards of Training the “Abdominal Line” (Rectus Abdominis) for Women’s Uterus

The “vest-line” (defined abdominal muscles) exercise may adversely affect women’s uteruses, disrupting normal menstrual cycles. During such training, body fat percentage often decreases below normal levels, potentially leading to reduced menstrual flow or amenorrhea. Additionally, localized irritative pain cannot be ruled out. While performing vest-line exercises, women should closely monitor their own physical responses. Training should generally progress gradually, avoiding overly intense or exhaustive sessions in a single workout.