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30

sternum, i n - breast bone; ductus, us m - duct.

V. DECLENSION

There are five declensions in Latin; that is, five categories of nouns, each with its own endings. The declension is determined by the Genitive singular endings.

First declension

The nouns of feminine which end in -a are ascribed to the first declension. The Genitive form of the first declension nouns ends in –ae.

E.g.:

costa, ae f - rib

 

vertěbra, ae f - vertebra

Second declension

To the second declension are referred masculines which end in –us and – er, and neuters which end in –um, -on. The Genitive form of the second declension nouns ends in –i.

E.g.:

nasus, i m - nose;

 

collum, i n - neck;

 

olecrănon, i n - tip of the elbow;

 

cancer, cri m - cancer.

Attention!!! – In the anatomical terminology there are no nouns which end in –er. The ending –on have the following anatomical terms:

acromĭon, i n – acromial process

colon, i n – large intestine

encephălon, i n – brain

ganglĭon, i n – ganglion

olecrănon, i n - tip of the elbow

31

Third declension

The third declension includes nouns of all the three genders which have different endings in Nominative singular and –is in Genitive singular.

E.g.: canālis, is m - canal; regĭo, ōnis f - region; os, ossis n - bone.

Fourth declension

The fourth declension includes masculines which end in –us, and the neuters which end with –u. The Genitive singular form of these nouns ends in – us.

E.g.:

arcus, us m - arch;

 

cornu, us n – horn.

Attention!!! - In the anatomical terminology there are only two neuters of the 4th declension which end in –u: cornu, us n (horn), genu, us n (knee).

Attention!!! - In the anatomical terminology there is only a limited number of masculines of the fourth declension. You should remember some of them as follows:

aqu(a)eductus, us m

aqueduct

arcus, us m

arch

ductus, us m

duct

meātus, us m

tract, passage

processus, us m

process

sinus, us m

sinus; hollow

textus, us m

tissue

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