i.
Vertex : Summit of the head between compound eyes.
ii.
Frons : Facial area below the vertex and above clypeus.
iii.
Clypeus : Cranial area below the frons to which labrum is attached.
iv.
Gena : Lateral cranial area behind the compound eyes.
v.
Occiput : Cranial area between occipital an post occipital suture.
Sutures of Head
i.
Epicranial suture : (Ecdysial line) Inverted `Y' shaped suture found medially on the top of
head, with a median suture (coronal suture) and lateral suture (frontal suture).
ii.
Epistomal suture : (Fronto clypeal suture) found between frons and clypeus.
iii.
Clypeo labral suture : Found between clypeus and labrum.
iv.
Post occipital suture : Groove bordering occipital foramen. Line indicating the fusion of
maxillary and labial segment.
Posterior opening of the cranium through which aorta, foregut, ventral nerve cord and neck
muscles passes is known as
Occipital foramen .
Endoskeleton of insect cuticle provides space
Insect Morphology and Systematics
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for attachment of muscles of antenna and mouthparts, called as
Tentorium . The appendages like
a pair of compound eyes, 0-3 ocelli, a pair of antenna and mouth parts are called as
