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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

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

Fifth declension

The fifth declension includes nouns of feminine which end in –es in Nominative singular and in -ei in Genitive singular.

E.g.: facĭes, ēi f – surface, face (this is the only noun of the fifth declension you meet in the exercises).

Remember the endings of Nominative and Genitive singular of all declensions:

Declension

I

II

III

IV

V

Gender

f

m

n

m f n

m

n

f

Nominative singular endings

a

us

er

um

on

different

us

u

es

Genitive singular endings

ae

i

is

us

ēi