The teeth (dentes) are named from the center and then going laterally: Incisor tooth (dens incisivus) Canine tooth (dens caninus) Premolar tooth (dens praemolaris) Molar tooth (dens molaris) Man has two sets of teeth, the: Deciduous (milk) which are also known as primary dentation. The deciduous dentations (dentes decidui) appear between the 6th and 24 months. The first deciduous tooth is the …
The maxilla (maxilla) or upper jaw is a paired bone. It takes part in the formation of the orbit, nose and septa between the cavities of the nose and mouth, and participates in the process of mastication. The maxilla consists of a body and four processes (frontal, alveolar, palatine, and zygomatic). Four processes are as follows:
The hyoid bone (os hyoideum)is situated at the level of the base of the tongue, beneath the mandible and above the larynx. It consists of the: Body of the hyoid bone (corpus ossis hyoidei). Greater horn (cornu maius) which continues from both ends of the body and extends backward and laterally. Lesser horn (cornu minus) which arises from the junction of the body and …
The mandible (mandibula) or the lower jaw is the sole mobile bone of the skull. It’s action is indispensable for mastication. Moreover, the mandible is the largest and toughest bone of the splanchnocranium. It is made up of two parts: body of the mandible, and ramus of the mandible.
The desmocranium and the skull of a newborn before ossification is soft during palpation and contains non- ossified spots of the connective tissue called cranial fontanels (fonticuli cranii). They are situated at the junctions of the skull’s sutures. The following fontanels are distinguished: Anterior fontanele (fonticulus anterior) exists in the midline between the coronal and the sagittal suture (anterior …
The temporal bone (os temporale) is a paired bone forming the lateral part of the base of the skull and it contains the organs of hearing and equilibrium. It has three parts (squamous part, petrous part, and tympanic part).
The ethmoid bone (os ethmoidale) is an unpaired bone of the neurocranium, although most of it makes up the viscerocranium. The ethmoid bone is located centrally between the bones of the visceral cranium and comes in contact with most of them to form the nasal and orbital cavities. The bony plates of the ethmoid bone are arranged in the form of the …
The sphenoid bone (os sphenoidale)is an unpaired bone resembles a bat or a flying insect, which explains the naming of its parts (pterygoid processes – pterygion = wing). The sphenoid bone has the following parts:
The unpaired occipital bone (os occipitale) forms the posterior part f the base and posterior wall of the skull. It is made up of four parts, which fuse to form a single bone forming the borders of the foramen magnum as follows, the: Basilar part (pars basilaris) – anteriorly. Squamous part (squama occipitalis) – posteriorly. Lateral or condylar parts (partes laterales) –laterally.
The parietal bone (os parietale)is a paired, flat bone which forms the roof of the skull. The parietal bone has two surfaces, four borders, and four angles. The parietal bone has four borders: The parietal bone has four angles:
