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Saturday, July 3, 2010

FACIAL BONES ANATOMY - LESSON 210

Now we will learn about facial bones.  These bones are joined together by sutures. There are specific air cavities called sinuses located in specific spaces within the facial bone and cranial bones.  Sinuses soften the skull and gives humidity to the air passes through these bones.

Nasal bones, vomer, lacrimal bones, zygomatic bones, mandibular bone, and maxillary bones. We will see about each bone one by one now. 

1.  Nasal bones:  Nas/o means nose.  We can say these bones as nose bones.  These bones give support to the nasal bridge.  Nasal bones join with the frontal bone superiorly and form part of the nasal septum.

2.  Vomer:  This is a thin facial bon.  Vomer is single in number.  This bone is flat in structure.  Vomer forms the lower part of the nasal septum.

3.  Lacrimal bones:  These bones are two in number.  Lacrim/o means tear.  Lacrimal bones are situated on each side of the eye at the corner of each eye.  These bones consist of a duct called tear duct or lacrimal duct.  These tear ducts pass through the lacrimal bones.

4.  Zygomatic bones:  These facial bones are two in number.  They are situated on each  side of the face.  These bones make the upper region of the cheek in the face.

5.  Mandibular bone:  Facial bones are firm and immovable.  The only exception is the lower jaw bone or mandible, which is a moveable bone in the face.  By this movement only, we can do the activities, such as chewing of food or mastication and speaking.  Alveoli is a socket formed by the bone of the upper jaw called maxillary bones and the mandibular bone, in which the teeth are embedded.  There is an attachment on either side of the skull called TMJ or temporomandibular joint, which joins the temporal and mandibular bones.

6.  Maxillary bones:  These bones are two in number.  These bones are joined in the median plane. Maxillary bones compose the big upper jaw bones called maxillae (singular maxilla).  Cleft palate is a congenital condition of a baby, in which these two maxillary bones do not come together before birth.

In the next lesson we will learn about the anatomy of the vertebrae and the vertebral column. Okay.

Come on.

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