External Obliques

Definition

The external oblique muscles are a pair of broad, flat muscles located on the lateral aspects of the abdominal wall. They play a crucial role in the axial musculature of the abdomen and thorax, contributing to core stability, trunk rotation, and various other functions.

5 Must Know Facts For Your Next Test

1. The external obliques originate from the lower eight ribs and insert onto the linea alba and pubic crest, forming the anterior abdominal wall.
2. They are responsible for lateral flexion and rotation of the trunk, as well as compression of the abdominal cavity during activities like coughing, sneezing, and defecation.
3. The external obliques work synergistically with the internal obliques and transverse abdominis to provide core stability and support the spine.
4. Weakness or imbalance in the external obliques can contribute to poor posture, low back pain, and decreased athletic performance.
5. The external obliques are often targeted in abdominal exercises like side planks, bicycle crunches, and oblique twists to strengthen the core musculature.

Review Questions

• Describe the anatomical location and attachments of the external oblique muscles.
  • The external oblique muscles are located on the lateral aspects of the abdominal wall. They originate from the lower eight ribs and insert onto the linea alba and pubic crest. This strategic positioning allows the external obliques to contribute to core stability, trunk rotation, and compression of the abdominal cavity during various functions like coughing and sneezing.
• Explain the role of the external obliques in the context of the axial musculature of the abdominal wall and thorax.
  • The external obliques are a crucial component of the axial musculature of the abdominal wall and thorax. They work synergistically with the internal obliques and transverse abdominis to provide core stability and support the spine. Additionally, the external obliques are responsible for lateral flexion and rotation of the trunk, making them essential for maintaining proper posture and facilitating various movements and activities.
• Analyze the potential consequences of weakness or imbalance in the external oblique muscles.
  • Weakness or imbalance in the external oblique muscles can lead to a variety of issues, including poor posture, low back pain, and decreased athletic performance. The external obliques play a vital role in core stability and trunk rotation, so any deficiencies in these muscles can result in compensatory movements and increased strain on other muscle groups. Maintaining proper strength and balance in the external obliques is crucial for overall core function and optimal physical performance.

Related terms

Transverse Abdominis: The deepest layer of the abdominal wall muscles, responsible for compressing the abdomen and stabilizing the spine.

Internal Obliques: The middle layer of the abdominal wall muscles, situated between the external obliques and transverse abdominis, also involved in trunk rotation and flexion.

Rectus Abdominis: The paired, long muscles running vertically along the front of the abdomen, known for creating the 'six-pack' appearance.