Lab 6 Notes - Lab 6 Notes In this lab we will cover the...

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Lab 6 Notes In this lab we will cover the skeleton, dentition, muscles and blood vessels in the head. We will also cover the boundaries and structures of two important spaces in the head, the nasal and oral cavities. Bones of the skull The skull can be divided into the neurocranium (the bones around the brain), and the face . The cranial vault, the space occupied by the brain, is divided into three parts- the anterior , middle and posterior cranial fossae . Neurocranium- frontal, parietal, occipital, temporal and sphenoid. The frontal bone is located at the anterior part of the neurocranium and also underlies the forehead and forms the superior rim of the eye-socket. It has few features you need to remember. The posterior border of the frontal is the articulation with the parietal bones, via the coronal suture . If you remember the anatomical planes you will recognize the orientation of the coronal suture. The frontal bone has an air-filled space continuous with the nasal cavity called the paranasal sinus or frontal sinus . In this lab we will encounter two different sorts of sinuses- air sinuses and venous sinuses. The sinuses within the bones are air-filled; they can be important as pathways of infection as each must somehow be connected with the outside world. The parietal bones make up the roof and parts of the sides of the cranial vault. They articulate anteriorly with the frontal (coronal suture) and posteriorly with the occipital via the lambdoid suture - so called because it resembles the Greek letter λ. The two parietal bones are connected in the midline by the sagittal suture . They articulate inferiorly with the temporal bone via the squamosal suture and with the greater wing of the sphenoid. The occipital bone is an unpaired bone making up the posterior part of the skull- forms the posterior wall of the cranial cavity and then curves inferiorly to form the floor of the posterior cranial fossa- main features are the foramen magnum , the occipital condyles on the inferior surface for the articulation with the atlas, and the hypoglossal canal for the cranial nerve XII (hypoglossal nerve) to exit the skull. The hypoglossal canal passes through the base of each condyle. The occipital joins the sphenoid anteriorly, the only hyaline cartilage joint in the skull, which is called the spheno-occipital synchondrosis. The jugular foramen is a large hole located between the occipital and temporal bones. In addition to the internal jugular vein, it is also the cranial exit for the glossopharyngeal (IX), vagus (X) and accessory (XI) nerves. The temporal bones have three parts- squamosal , petrous and tympanic portion. The squamosal portion of the temporal bone is the flat part that makes up part of the sides of the skull and has suture connections with the parietal and occipital bones. Anteriorly, there is the zygomatic process that connects to one of the bones of the face, the zygomatic . This makes up the “zygomatic arch”, the part of the cheekbones that you can
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Lab 6 Notes - Lab 6 Notes In this lab we will cover the...

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