Friday, February 8, 2013

Facial bones


THE FACIAL BONES

All of the facial bones are joined together by sutures except one, so they are immovable. The mandible is the only bone on the face capable of movement. This ability is necessary for activities such as mastication (chewing) and speaking. 


1. NASAL BONES - the two slender bones that support the bridge of the nose. They join the frontal bone superiorly and form part of the nasal septum.
picture from http://www.upstate.edu/cdb/education/grossanat/hnsklatnb.shtml





2. LACRIMAL BONE - the two small, thin bones located at the corner of each eye. The lacrimal (lacrim/o meaning tears) bones contain fossae for the lacrimal gland (tear gland) and canals for the passage of the lacrimal duct. 
picture from http://www.upstate.edu/cdb/education/grossanat/hnskullantlb.shtml





3. MAXILLARY BONE - the two large bones that compose the massive upper jawbones (maxillae). they are joined by a suture in the median plane. if the two bones do not come together normally before birth, the condition known as cleft palate results. 
picture from http://www.upstate.edu/cdb/education/grossanat/hnsklatmax.shtml





4. MANDIBULAR BONE - the lower jawbone (mandible). Both the maxilla and the mandible contain the socked called alveoli in which the teeth are embedded. The mandible joins the skull at the region of the temporal bone, forming the temporomandibular joint (TMJ) on either side of the skull. 
picture from http://www.upstate.edu/cdb/education/grossanat/hnsklatman.shtml





5. ZYGOMATIC BONES - the two bones, on each side of the face, that form the high portion of the cheek. 
picture from http://www.upstate.edu/cdb/education/grossanat/hnsklatzb.shtml





6. VOMER - the thin, single, flat bone that forms the lower portion of the nasal septum. number 7 in the picture below is the vomer
picture from http://msjensen.cehd.umn.edu/webanatomy/skeletons_skulls/skull_anterior_4_answers.htm