Terminology - Online Medical Dictionary

"U.S. Type of Breasts", "US Type of Breasts"

  

 

 MEANING OF THE EXPRESSION

"U.S. Type of Breasts", also "US Type of Breasts", "The U.S. Type of Breasts",  "The US Type of Breasts" 

 

 

Definition:

U.S. Type of Breasts (Anatomy)

 

Female breasts expressing the breast characteristics typical for U.S. females (i.e. "North American Breast Characteristics", also "American Breast Characteristics", "U.S. Breast Characteristics"):

1. Large Breast Volume

2. Firm Breast Tissue Consistency

3. Hemispheral Breast Shape

4. High placed and upwards pointing Nipples

 

ANATOMICAL TERMINOLOGY "U.S. Type of Breasts", also "US Type of Breasts", "The U.S. Type of Breasts",  "The US Type of Breasts" 

 

 

  Definition Details:

 

The expression "U.S. Type of Breasts" is used as an anatomically descriptive medical term (Med.), but also in fashion and entertainment Industry (Commerc.)

In medicine, a female individual has by definition the U.S. Type of Breasts, when her breast anatomy expresses all four breast characteristics typical for Caucasian U.S. women,

(i.e. "The U.S. Breast Characteristics", also "North American Breast Characteristics", "American Breast Characteristics", "U.S. Breast Characteristics"):

 

 

1. Large Breast Volume

The volume of the U.S. Type of Breasts is > 1 200 ml.

The volume of both left and right breast exceeds 1 200 ml.

However, in the U.S.A, the expression the U.S. Type of Breasts is seldom used, if the breast volume is below 1 500 ml.

Caucasian women (age 28 - 30 years) born in the U.S.A. have an average breast volume of 1 668 ml. The highest quartile of Caucasian U.S. women have a mean breast volume of 2 986 ml.*

 

2. Firm Breast Tissue Consistency

U.S. Type of Breasts are relatively firm in consistency in comparison to international reference material.

In most practical medical situations, breast consistency is evaluated subjectively by a medical surgeon. The breasts of a typical U.S. woman have relatively rigid and durable suspensory ligaments, which

position her breasts firmly high upon the chest wall and give the breasts quite a rigid hemispherical shape. This is mostly related to the thick ligament structures and the relatively high content of

collagenous fibers in the connective tissue of the breast supporting ligaments and fascia of North American women of Caucasian origin. There is also some evidence indicating that

the higher glandular tissue/adipose tissue ratio of the breasts of Caucasian women born in the U.S.A. may be an additional factor contributing to the relatively firm consistency of their breasts.  

 

3. Hemispherical Breast Shape

U.S. Type of Breasts have a round, hemispherical shape.

The rigid suspensory ligaments of a typical U.S. woman position her breasts firmly high upon the chest wall and give the breasts a hemispherical shape.

In most countries of the world, the average woman has "pear-shaped" breasts. Except for the U.S.A, the most common breast shape in the highest breast volume quartile is "Pendulous Breasts"

or "Breasts with Low Nipples". In contrast, Caucasian U.S. women belonging to the highest volume quartile have most commonly more hemispherical, i.e. "roundish" breasts with high placed nipples.

 

4. High placed and Upwards Pointing Nipples

The Nipple of U.S. Type of Breasts is placed above the center of gravity. The nipple axis is pointing up from the horizontal level with an Angle of +5 to +72 Degrees.

The nipple of the average U.S. woman is pointing up with an angle of 24 degrees to the horizontal and is placed 3.84 cm (1.51 in) above the center of gravity of her breasts.

In women born in the other countries, the nipple is on the average placed 2.42 cm (0.95 in) below the center of gravity and it makes an angle of -14 degrees to the horizontal.

The differences in the nipple position are, at least to a certain degree, linked to the differences in the average breast shape and the structure of the breast supporting ligaments, between women of different

ethnic origin. 

 

 

Additional Information:

Internationally, the Term U.S. Type of Breasts is used also to refer to breasts enhanced with implants, while most U.S. practitioners limit the use of the expression to unenhanced i.e., natural breasts.

The natural U.S. Type of Breasts are very rare among non-U.S. women. Outside the U.S.A., the U.S. Type of Breasts are nearly exclusively a result of breast enlargement surgery.

 

 

Visual References:

 

    

          Ref. Fig. 00234221_001: U.S. woman with the U.S. Type of Breasts.

 

 

 

 

An illustration of the topographic anatomy of a woman with a large pair of the U.S. Type of Breasts.

 

 

 IBSS Photographic Refence Library, File Archive "U.S. Type of Breasts" republished on the permission of IBSS International Association.

 

 

 

IBSS Standard is the most widely established international reference system for classification of female breasts.

The Standard divides breasts into 16 different breast types based on morphological and physiological characteristics.

 

 

 

Article References:

 

*Anderson JDL, Chandler SC, Mason MAB, Khan CB, Lindsay JE, Sandler RM, Wong LG. Scientific Analysis Reveals Major Differencies in Breast Size of Women in Different Countries  - U.S. women have a significantly larger mean breast volume than women

born in other countries. JFHS 2013 Aug 8. pii: S0098-7647(14)01086-9.

 

Friedelberg MJ, McGossian R, Lee M, Jenkins L, Henderson JA, Newman A, Friedman R, Molina HA. Lin U.S. Breast Characteristics - Distinctive Anatomy and Physiology of the U.S. Type of Breasts. A Review of Scientific Publications and Symposium Posters Approved for Publication.

 

 

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Journal of Commercial Applications of Anatomy, Physiology and Sociology. March 2016. 12.1552/japplanatphysiolsociol.00736.2016