What is a normal anatomic variant?

A normal variant is an atypical finding that is seen in a percentage of the population, which generally has no clinical significance, and is considered within the spectrum of normal findings. Scroll down to view images of normal anatomical variants. Click on an image to see a full larger version with arrows.

What causes anatomic variation?

Anatomical variations are mainly caused by genetics and may vary considerably between different populations. The rate of variation considerably differs between single organs, particularly in muscles. Knowledge of anatomical variations is important in order to distinguish them from pathological conditions.

How are most anatomical variations identified?

Since the systematic study of human anatomy began in the Renaissance, and before the discovery of x-rays, most anatomical variants were discovered through cadaveric dissection or incidentally at surgery.

What is the meaning of anatomic?

Medical Definition of anatomic 1 : of or relating to anatomy anatomical knowledge. 2 : structural sense 1 an anatomic obstruction.

What is an example of anatomical variation?

Anatomical variations include muscle agenesis, supernumerary muscles and muscles with anomalous origins or insertions. An accessory muscle is a distinct muscle unit in addition to the normal group of muscles in that region.

What does anatomic mean in medical?

What is anatomical variation vs pathological change?

Modern definitions describe an anatomical variant as “a deviation from the ‘normal’ arrangement of an anatomical structure without causing a demonstrable impairment to its functioning” [19,20]. This is in contrast to a pathological abnormality, which may impair functioning of one or more anatomical structures.

What are the signs of an abnormal baby?

What are the symptoms of birth defects in a child?

  • Abnormal shape of head, eyes, ears, mouth, or face.
  • Abnormal shape of hands, feet, or limbs.
  • Trouble feeding.
  • Slow growth.
  • Frequent infections.
  • Joint problems.
  • Spinal cord not fully enclosed (spina bifida)
  • Kidney problems.

What is anatomic alignment of the lumbar spine?

The normal curve of the lumbar spine is a lordosis. This is a forward curve that helps keep the discs and muscles in proper alignment. The lumbar spine rests upon the sacrum. The place where they meet is called the lumbosacral joint, or L5-S1.

What are examples of anatomical features?


  • Ear.
  • Nose. Nostril.
  • Mouth. Lip. Philtrum. Jaw. Mandible. Gingiva. Tooth. Tongue.
  • What percentage of the population has an anatomical variant?

    Infrequent variations are present in 1–10% of cases (e.g., arteria thyroidea ima is reported to appear in approximately 0.4–10% of cases [22]), and rare variations are present in less than 1% of cases (e.g., situs viscerum inversus).

    Can ultrasound detect abnormalities baby?

    Ultrasound is the most common tool used to detect birth defects. Doctors use an ultrasound to conduct a system-by-system analysis of the baby.

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