Question

Which of the following facial bones is unpaired?
A. Lacrimal
B. Palatine
C. Nasal
D. Vomer

Answer 1

Hint: Facial bones are a part of the facial skeleton which are attached to the skull to build a portion. Facial anatomy is also referred to as Membranous viscerocranium in human anatomy and development. The front portion of the skull is made up of facial bones.

Complete answer: The human skull consists of two types of bones. They are cranial bones which total 8 in number and 14 facial bones. The skull is made up of a total of 22 bones. The bones which are responsible for the formation of the front portion of the skull are called facial bones. Facial bones are also called viscerocranium. Many muscles and soft tissues of the neck, head, and face are supported by the facial bone. The facial bones together form the facial skeleton which is attached to the skull. The fourteen facial bones are inferior turbinate, lacrimal bone, mandible, maxilla, nasal bone, palatine bone, vomer, and zygomatic bone. Out of 14 facial bones, 2 facial bones are unpaired and the rest 12 facial bones are paired. The mandible and vomer are unpaired facial bones of the facial skeleton. The facial bones have holes in them called foramina which allow the passage of cranial nerves and blood supply to the face.
So, option D is the correct answer.

Note: The shape of the facial skeleton decides the shape of the face. The facial skeleton is made up of dermal bone which is derived from the neural crest cells. The differing patterns of biological inheritance are responsible for the variations in craniofacial form between humans.