
The oblique muscles are the muscles on the sides of the torso that enable side-to-side bending, torso rotation, and spinal flexion. There are two layers of oblique muscles: the internal and external obliques. The external oblique is the largest and outermost of the three flat abdominal muscles of the lateral anterior abdomen. It is situated on the lateral and anterior parts of the abdomen and originates from ribs 5-12. The internal obliques lie under the external obliques, making them the core's deeper muscles. Both layers of oblique muscles play a pivotal role in stabilizing and protecting the spine.
| Characteristics | Values |
|---|---|
| Type | Abdominal muscles |
| Number of Layers | 2 |
| Muscle Type | Flat muscles |
| Size | Largest of the flat muscles |
| Shape | Broad, thin, and irregularly quadrilateral |
| Location | Lateral and anterior parts of the abdomen |
| Visibility | Not visible in most humans |
| Functions | Holding internal organs in place, protecting the spine, maintaining posture, supporting the trunk, aiding movement, stabilising the pelvis, controlling bending physical activities, assisting with breathing |
| Organ Systems Affected | Digestive system, urinary system, reproductive system |
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What You'll Learn

The external oblique muscle
The external oblique is one of the five main abdominal muscles, along with the pyramidalis, rectus abdominis, internal obliques, and transversus abdominis. These muscles work together to produce movements of the spine and to compress the abdominal viscera. They also help to hold organs in place, support the body during movement, and protect the spine.
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The internal oblique muscle
The lateral fibres of the internal oblique originate from the anterior two-thirds of the iliac crest and then diverge superiorly and medially. They extend into an aponeurosis that contributes to the formation of the rectus sheath and inserts at the linea alba. The rectus sheath largely encloses the rectus abdominis and pyramidalis muscles, as well as many neurovascular structures of the anterior abdominal wall. The internal oblique muscle is continuous with the rectus sheath.
The posterior fibres of the internal oblique originate from the posterior end of the iliac crest and the thoracolumbar fascia. They then ascend superolaterally and insert into the inferior borders and tips of the lower three or four ribs and their cartilages. Here, they merge with the internal intercostals of the aforementioned ribs.
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Oblique muscle exercises
The oblique muscles are the muscles on the sides of your torso that enable side-to-side bending, torso rotation, and spinal flexion. They are major muscles in the abdominal area and play a pivotal role in stabilising and protecting your spine. There are two types of oblique muscles: the internal obliques and the external obliques. The internal obliques lie under the external obliques, making them the core's deeper muscles.
Russian Twists
Russian twists are a classic core move that targets your side abs. To perform this exercise, lie on your back with your knees bent and feet flat on the ground. Place your arms straight out in front of you, then twist your torso from side to side, tapping your arms on the ground on each side.
Single-Leg Jackknife
This exercise involves lying on your back with your legs extended and your arms at your sides. Lift your shoulders and upper back off the ground and bring your knees towards your chest while lifting your hips. Then, straighten your left leg and twist your torso so that your left elbow touches your right knee. Repeat on the other side.
Side Plank
The side plank is an anti-lateral flexion exercise that targets the muscles along the sides of your abdomen. To perform this move, lie on your left side and prop yourself up with your left forearm, so that your body forms a straight line from head to feet. Raise your right arm towards the ceiling, making sure your hips don't dip.
Pelvic Tilt
This exercise can be done standing with your back against the wall. Stand with your feet about one foot in front of the wall and hip-width apart, with your knees slightly bent. Gently perform a pelvic tilt with your glutes relaxed. Reach your arms forward and down so your upper back comes off the wall, but keep your lower back in contact with the wall. Inhale, pressing your arms back to the wall, and exhale as you reach your armpits forward.
Oblique Crunches
Lie on your back with your knees bent and feet flat on the floor. Place your hands behind your head and lift your shoulders off the floor. Then, crunch down to one side, bringing your elbow towards the opposite knee. Repeat on the other side.
It is important to note that you don't need to do targeted oblique exercises every day, as these muscles are involved in many full-body compound movements. However, doing specific oblique exercises two to three times per week can help strengthen these muscles.
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Oblique muscle injuries
The obliques are the muscles that run down the sides of the torso, connecting the ribs to the pelvis and lower back. They are integral to the core abdominal muscles and are made up of two layers: the internal and external obliques. These muscles work together to enable bending, twisting, and rotating movements. Oblique injuries can occur when these muscles are overstressed or strained, often due to sudden movements, improper form during exercises, or repetitive actions that place excessive pressure on the muscles.
For external oblique injuries, individuals might experience sharp, localized pain on the side of their abdomen, which intensifies during movements like bending to the side or twisting the torso. Internal oblique injuries, on the other hand, can be more challenging to pinpoint. It is important to recognize the signs of an internal or external oblique muscle injury early and seek appropriate treatment.
Conservative treatment methods, such as rest, ice, or heat therapy, are often sufficient for recovery from oblique muscle strains. Additionally, physical therapy can offer accessible, natural treatment options for both external and internal oblique injuries. Physical therapy for oblique injuries typically involves exercises that focus on strengthening and stabilizing the core, gentle stretching to improve flexibility, and specific strengthening exercises for the affected oblique muscles to enhance their resilience and reduce the risk of re-injury.
To prevent oblique injuries, it is important to practice correct techniques for sports and work on conditioning. Additionally, stretching, warming up, and cooling down when exercising can help reduce the risk of oblique muscle strains.
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Oblique muscle functions
The abdominal external oblique muscle, or simply the external oblique, is the largest and outermost of the three flat abdominal muscles of the lateral anterior abdomen. The external oblique is situated on the lateral and anterior parts of the abdomen. The muscle is broad, thin, and irregularly quadrilateral, and in most humans, it is not visible due to subcutaneous fat deposits and its small size.
The external oblique functions to pull the chest downwards and compress the abdominal cavity, which increases intra-abdominal pressure. It also performs ipsilateral (same-side) side-bending and contralateral (opposite-side) rotation: the right external oblique would side-bend to the right and rotate to the left, and vice versa. The internal oblique muscle functions similarly, except it rotates ipsilaterally.
The external oblique muscle is one of the outermost abdominal muscles, extending from the lower half of the ribs around and down to the pelvis. Together, the external oblique muscles cover the sides of the abdominal area, being large and sitting on the top surface of the abdomen right below the subcutaneous fat and skin. The internal obliques are underneath the external obliques on each side of the trunk.
The internal and external obliques work together to allow the trunk to twist and turn. They also help stabilize the trunk and maintain consistent internal pressure in the abdomen. This helps support the spine and trunk during walking, sitting down, standing up, or twisting from side to side. They also help hold internal organs in place and protect them. This includes the stomach, intestines, pancreas, liver, gallbladder, and other organs.
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Frequently asked questions
The oblique muscles are the muscles on the sides of your torso that enable side-to-side bending, torso rotation, and spinal flexion. There are two layers of oblique muscles: the internal and external obliques.
The internal oblique muscles are the deeper core muscles that lie under the external obliques. They function similarly to the external oblique muscles, except they rotate ipsilaterally.
The external oblique muscles are the largest and outermost of the three flat abdominal muscles of the lateral anterior abdomen. They originate from ribs 5-12 and insert onto the iliac crest and pubic tubercle. They function to pull the chest downwards and compress the abdominal cavity, increasing intra-abdominal pressure.











































