The document discusses the internal structure of an insect's head. It contains labeled diagrams showing the main anatomical features including the anterior and dorsal tentorial arms, epistomal ridge and suture, postoccipital ridge and suture, subgenal ridge and suture, and tentorial bridge and posterior tentorial pit.

1. INSECT HEAD AND
IT’S TYPES
Dr. V. S Acharya
Associate Professor (Ento)
College of Agriculture, Bikaner

12. Internal Structure of Head
AT, at, anterior tentorial arm and pit;
DT,dorsal tentorial arm;
ER, es, epistomal ridge and suture;
PoR, pos, postoccipital ridge and
suture;
SgR, sgs, subgenal ridge and suture;
TB, pt, tentorial bridge and posterior
tentorial pit.