Question

Zygomatic arch in Rabbit is formed by:
A) Premaxilla, Maxilla and Palatine
B) Maxilla, Jugal and Squamosal
C) Periotic, Maxilla & Premaxilla
D) All of the above

Answer 1

Hint:
The zygomatic arch is formed in synapsid animals, that have a single temporal fenestra or temporal bone having a hole. A clear hole is seen in the side of the skull, in some ancestral-mammal-like reptiles. The temporal fenestra often molds with the orbit, that houses the eye.

Complete step by step answer:
The zygomatic arch is present under orbit. And this is made up of maxilla, jugal, and squamosal bone. Another name for the zygomatic arch is the cheekbone. For attachment
large, muscular muscles require large arches. The size of the lower jaw is related to the size of the zygomatic arches.
In humans the upper jaw is made up of 14 bones i.e., 7 pairs of bones which are premaxilla, Maxilla, Jugal, squamosal, Pterygoid, Palantine, and Quadrate. Out of these 7 pairs of bones, only quadrate are not visible because they constitute ear ossicles i.e., incus. In man, the nasal cavity is separated by the buccal cavity by a bone called the palatine complex.
Premaxilla: Nasal process on the dorsal side which is covered by the nasal, palatine process of the premaxilla.
Squamosal: Only zygomatic process of squamosal.
Hence the correct answer is Maxilla, jugal, squamosal.

Option ‘B’ is correct

Note:
The upper jaw in vertebrates is completely ossified with the skull but the lower jaw is always free from the chondrocranium and hangs downwardly bone is the suspensorium, which hangs the lower jaw from the upper jaw.