Question

The postorbital constriction seen in the early hominids is caused by?

a) the need for a nuchal crest to form

b) Needing room for large muscles running through the temporal fossa

c) by the expanding frontal lobe of the brain

d) to hold space for the retromolar space

Answer 1

correct answer is option B -Needing room for large muscles running through the temporal fossa

Postorbital constriction is seen in early hominids like homo habilis,Australopithecus.it represent the narrowing of the space behind the Orbital socket.

When the homind develops the size of the cranium is increased resulting in the expansion of the Frontal lobe of the brain, the Postorbital Constriction become unnoticeable.

Temporal fossa in the early hominid with postorbital constriction is large. it is the room for the passage of Temporalis muscle.

Retromolar space is the pace at the back of the mandible, \this space is present in between the back of the last molar and the anterior edge of the ascending ramus.because of this the lower teeth is little forward .