Category: Biology Second Paper Lecture Sheet

Mandible is the lower jaw. It looks U shaped. It consists of a trunk and 2 branches. It has two amplifiers. Coronoid and condyloid.

The upper jaw consists of two equal maxillae. Right and left maxilla. It has four amplifiers. These are – zygomatic, palatine, frontal and alveolar.

It is a quadrangular bone. It consists of an elevated part called the zygomatic arch.

It consists of a lacrimal shaft, lacrimal sac and nasolacrimal duct.

It forms the roof of the nose and the wall of the nasal cavity.

It is a quadrangular plate like bone. It forms the NASA interface.

A pair of thin and curved bones located on either side of the nasal cavity are the nasal concha.

It is a rectangular bone. It forms the bridge of the nose.

The front and lower part of the carotid body is called the face. It consists of 14 bones in total. The facial bones are:
(i) Nasal bone: It is a rectangular bone. It forms the bridge of the nose.
(ii) Nasal Concha: A pair of thin and curved bones located on either side of the nasal cavity are the nasal concha.
(iii) Vomare: It is a quadrangular plate like bone. It forms the NASA interface.
(iv) Palatine bone: It forms the roof of the nose and the wall of the nasal cavity.
(v) Lacrimal bone: It consists of a lacrimal shaft, lacrimal sac and nasolacrimal duct.
(vi) Zygomatic bone: It is a quadrangular bone. It consists of an elevated part called the zygomatic arch.
(vii) Maxilla: The upper jaw consists of two equal maxillae. Right and left maxilla. It has four amplifiers. These are – zygomatic, palatine, frontal and alveolar.
(viii) Mandible: Mandible is the lower jaw. It looks U shaped. It consists of a trunk and 2 branches. It has two amplifiers. Coronoid and condyloid.

Sphenoid is the bone forming the carotid floor. It looks like a bat or a butterfly. It consists of a body stem and 3 pairs of appendages. Its parts are the greater wing, the lesser wing and the pterygoid process.