SEMILUNAR LINE Meaning and
Definition
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The semilunar line is a prominent anatomical structure found in the human body. It refers to a curved line that extends across the lower abdomen, forming a distinctive border between the muscular rectus abdominis and the lateral abdominal muscles. The semilunar line is also referred to as the linea semilunaris or the arcuate line.
An important feature of the semilunar line is its shape, resembling a short arc that begins around the level of the iliac crest, and gradually curves downward towards the pubic symphysis. The line is formed by the fusion of two layers of abdominal muscles – the external oblique and the internal oblique – creating a strong and stable boundary for the abdominal wall.
The semilunar line is significant because it acts as a landmark in various medical and surgical procedures. For example, during abdominal surgeries, it serves as a guide for locating important anatomical structures such as the appendix or the inguinal ligament. Additionally, it is also used as a reference point when performing rectus sheath blocks for pain management.
Understanding the anatomy and location of the semilunar line is crucial for medical professionals as it aids in proper identification and orientation of structures within the lower abdomen. Its clarity and distinct shape make it an important reference point for both clinical and surgical applications.
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A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
Common Misspellings for SEMILUNAR LINE
- aemilunar line
- zemilunar line
- xemilunar line
- demilunar line
- eemilunar line
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- swmilunar line
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- srmilunar line
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- senilunar line
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- sejilunar line
- semulunar line
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Etymology of SEMILUNAR LINE
The term "semilunar line" consists of two words: "semilunar" and "line".
1. Semilunar: The word "semilunar" is derived from the Latin words "semi-" meaning "half" and "luna" meaning "moon". The term was coined due to the shape of the structure being described, which resembles a half-moon or crescent shape.
2. Line: The word "line" comes from the Middle English word "lyne", which in turn is derived from the Old English word "līne", meaning "rope" or "cable". It refers to a continuous or straight mark or path.
In combination, the term "semilunar line" refers to a half-moon shaped line or boundary. In anatomy, it specifically refers to two curved lines on either side of the abdomen, also known as the "semilunar lines of Douglas".
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