Comparative Study of the Second Vertebra in Frog, and Typical Cervical Vertebrae in Varanus, Fowl, and Rabbit with Comments and Diagrams

Comments

Second vertebra of Frog

i) Its neural spline is comparatively short and conical.

ii) It resembles the typical vertebra in structure except slight variation.

iii) Its transverse processes are small, flat and distally broad.

Typical cervical vertebra of Varanus

i) Centrum is stout and procoelous.

ii) Neural spine is vertical and crest-tike.

iii) Post Zygapophyses and prezygapophyses are present.

Typical cervical vertebra of Fowl

i) It is long as compared to the vertebra of Varanus.

ii) Centrum is heterocoelous or saddle-shaped.

iii) Neural spine is rudimentary.

iv) Neural arch is smaller than the centrum.

Typical cervical vertebra of Rabbit

i) Remaining five cervical vertebrae are similar in structure and therefore called typical cervical vertebrae.

ii) Centrum is acoelous and well developed.

iii) Neural spine is small, pointed and backwardly directed.