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The abdominal muscles are divided into two groups: the anterolateral and the posterior walls. The anterolateral abdominal wall has two vertical muscles, the rectus abdominis and the pyramidalis, and three flat muscles, the external oblique, the internal oblique, and the transversus abdominis. The posterior abdominal wall is made up of the lumbar vertebrae, pelvic girdle, five posterior abdominal muscles, and their associated fascia.
| Characteristics | Values |
|---|---|
| Number of abdominal muscle groups | 4 |
| Number of anterolateral abdominal muscles | 5 |
| Number of posterior abdominal muscles | 5 |
| Number of vertical muscles in the anterolateral abdominal wall | 2 |
| Number of flat muscles in the anterolateral abdominal wall | 3 |
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What You'll Learn
The external obliques
The abdominal muscles can be divided into four groups: the external obliques, the internal obliques, the transversus abdominis, and the rectus abdominis. The external obliques are the closest to the surface and extend inferiorly and medially, in the direction of sliding one’s four fingers into pants pockets. They are one of three flat muscles on the anterolateral side arranged from superficial to deep, the other two being the internal obliques and the transversus abdominis. The external obliques are also one of five paired muscles in the anterolateral abdominal wall, the other four being the internal obliques, transversus abdominis, rectus abdominis, and pyramidalis.
The external oblique is the largest and most superficial of the flat muscles of the abdomen. It is a broad, thin muscle that covers the side and front of the abdomen. The external oblique is responsible for several important functions, including flexion, extension, and rotation of the trunk. It also helps to maintain posture and stabilise the spine.
The external oblique originates from the lower eight ribs and inserts into the iliac crest, the inguinal ligament, and the pubic tubercle. Its main function is to compress the abdominal cavity and assist in forced expiration. It also helps to flex and rotate the trunk, as well as tilt the pelvis.
The external oblique is a crucial muscle for core stability and is often targeted in exercises such as oblique crunches, side planks, and Russian twists. Strengthening the external oblique can help improve posture, prevent back pain, and enhance athletic performance.
In summary, the external obliques are an important part of the abdominal muscle group, contributing to core stability, spinal stability, and movement of the trunk. They are a broad, thin muscle group that covers the side and front of the abdomen and are responsible for several vital functions in the body.
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The internal obliques
There are four groups of abdominal muscles: the external obliques, the internal obliques, the transversus abdominis, and the rectus abdominis. The internal obliques are a broad, sheet-like muscle, located deep to the external obliques. They are found on the lateral abdominal wall, comprising one of its three layers. They are perpendicular to the external obliques and are found below the costal margin. The internal obliques are important for movements of the trunk, maintaining normal abdominal tension, and increasing intra-abdominal pressure. They are also referred to as 'same-side rotators' because unilateral contraction ipsilaterally rotates the torso.
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The transversus abdominis
The abdominal muscles can be divided into four groups: the external obliques, the internal obliques, the transversus abdominis, and the rectus abdominis. The transversus abdominis is one of three flat skeletal muscles in the antero-lateral wall of the abdomen. The external oblique, closest to the surface, extends inferiorly and medially, in the direction of sliding one’s four fingers into pants pockets. Perpendicular to it is the intermediate internal oblique, extending superiorly and medially, the direction the thumbs usually go when the other fingers are in the pants pocket. The transversus abdominis is the deepest of the three flat muscles.
Weakness or dysfunction of the transversus abdominis can lead to a variety of issues. For example, it can contribute to lower back pain and instability of the lumbar spine. It can also affect the ability to breathe efficiently and may impact activities such as singing or playing wind instruments. Therefore, it is important to strengthen and train the transversus abdominis through specific exercises and movements.
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The rectus abdominis
The abdominal wall performs several vital functions. It contains and provides a scaffold for the development and functioning of abdominal viscera. All layers contribute to a degree of physical protection of the organs. The abdominal muscles contribute to movements of the trunk, including flexion, extension, lateral flexion, and rotation. The simultaneous contraction of abdominal muscles can facilitate the generation of intra-abdominal and intrathoracic pressure, which is critical in sneezing, coughing, vomiting, and defecating.
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The pyramidalis
The abdominal muscles can be divided into two groups: the anterolateral and posterior walls. The anterolateral abdominal wall consists of two vertical muscles located on the midline, bisected by the linea alba. These are the rectus abdominis and the pyramidalis. The rectus abdominis is the most superficial of the anterolateral abdominal muscles and is responsible for flexing the lumbar spine and stabilizing the pelvis during movement.
In summary, the pyramidalis is one of the two vertical muscles of the anterolateral abdominal wall, along with the rectus abdominis. It plays a crucial role in abdominal function by acting on the linea alba, providing stability and support to the abdominal region. The pyramidalis also assists in abdominal compression and helps stabilize the pelvis during various movements and activities.
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Frequently asked questions
There are four groups of abdominal muscles: the external obliques, the internal obliques, the transversus abdominis, and the rectus abdominis.
The four groups of abdominal muscles are the external obliques, the internal obliques, the transversus abdominis, and the rectus abdominis.
The three flat skeletal muscles in the antero-lateral wall of the abdomen are the external oblique, the internal oblique, and the transverse abdominis.
The two vertical muscles in the anterolateral abdominal wall are the rectus abdominis and the pyramidalis.
The five posterior abdominal muscles are the psoas major and quadratus lumborum bilaterally, and three others that are not specified.
