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The head rests on the top part of the vertebral column, with the skull joining at C1 (the first cervical vertebra known as the atlas). The skeletal section of the head and neck forms the top part of the axial skeleton and is made up of the skull, hyoid bone, auditory ossicles, and cervical spine. The skull can be further subdivided into:
The base of skull, also known as the cranial base or the cranial floor, is the most inferior area of the skull. It is composed of the endocranium and the lower parts of the calvaria . Structure
The anterior cranial fossa is a depression in the floor of the cranial base which houses the projecting frontal lobes of the brain. It is formed by the orbital plates of the frontal, the cribriform plate of the ethmoid, and the small wings and front part of the body of the sphenoid; it is limited behind by the posterior borders of the small wings of the sphenoid and by the anterior margin of ...
The atlas is the topmost vertebra and the axis (the vertebra below it) forms the joint connecting the skull and spine. The atlas and axis are specialized to allow a greater range of motion than normal vertebrae. They are responsible for the nodding and rotation movements of the head.
Superior view of the skull base. Middle cranial fossa shown in green. 1: Sphenoidal limbus (anterior margin of the chiasmatic groove) 2: Posterior borders of the lesser wings of the sphenoid 3: Dorsum sellae of the sphenoid bone. 4: Superior borders of the petrous part of the temporal bone
Modern human species have their temporal lobes positioned under the cranial base signifying the increase in the size of the human brain and skull. [ 25 ] The sagittal vault's morphology , which is the area that joins the two parietal bones together to make up the structure of the crown, has remained the same for archaic and modern human species.
Drawing of the base of the brain, from Andreas Vesalius's 1543 work De humani corporis fabrica One of Leonardo da Vinci's sketches of the human skull. In 1316, Mondino de Luzzi's Anathomia began the modern study of brain anatomy. [231] Niccolò Massa discovered in 1536 that the ventricles were filled with fluid. [232]
The neck is the part of the body in many vertebrates that connects the head to the torso. It supports the weight of the head and protects the nerves that transmit sensory and motor information between the brain and the rest of the body. Additionally, the neck is highly flexible, allowing the head to turn and move in all directions.