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In addition to the

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tsubtype hierarchy
represented by
Concept
t116680003|is a|
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trelationships
,
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tSNOMED CT
also represents a partonomy hierarchy using
Concept
t123005000|Part of|
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trelationship
. This creates an alternative hierarchy which can be also be used for navigation. The difference between these hierarchies is that:
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_4165bca8-6b76-4022-8e1e-609496ed7384__1
_4165bca8-6b76-4022-8e1e-609496ed7384__1

  • The

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    tsubtype hierarchy
    relates
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    tconcepts
    to supertypes that represent more general
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    tconcepts
    . Each body structure
    Gloss
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    tconcept
    has an
    Concept
    t116680003|is a|
    ShowFormatinline
    Gloss
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    trelationship
    to one or more
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    tconcepts
    that represents the whole or any part of the organ or other body part that contains it.
    Gloss
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    tConcepts
    that represent the whole or any part of an organ or body part are distinguished by their
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    tfully specified names
    which include the word 'structure'. These contrast with
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    tconcepts
    that represent the entirety of an organ or body part which contain the word 'entire'.

Example:

Concept
t53085002|Right ventricular structure|
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Concept
t116680003|is a|
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Concept
t80891009|heart structure|

  • The partonomy hierarchy relates body structure to

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    tconcepts
    to
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    tconcept
    that represent
    Concept
    t|the entirety of|
    ShowFormatinline
    or an organ or anatomical structure of which they form part

Example:

Concept
t244384009|Entire right ventricle|
(is)
Concept
t123005000|part of|
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Concept
t302509004|entire heart|
ShowFormatinline
Note: In everyday speech the word "heart" may mean either
Concept
t80891009|heart structure|
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or
Concept
t302509004|entire heart|
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and the distinction between them is often overlooked. However, from a semantic perspective the difference is highly significant. The removal of some part of an organ does not imply the removal of the entire organ. Thus, while it is correct to state that
Concept
t53085002|Right ventricular structure|
ShowFormatinline
Concept
t116680003|is a|
ShowFormatinline
Concept
t80891009|heart structure|
, it would be wrong to state that
Concept
t244384009|Entire right ventricle|
ShowFormatinline
Concept
t116680003|is a|
ShowFormatinline
Concept
t302509004|entire heart|
ShowFormatinline
or
Concept
t53085002|Right ventricular structure|
ShowFormatinline
Concept
t116680003|is a|
ShowFormatinline
Concept
t302509004|entire heart|
.