University:
Western Sydney University
Course:
MEDI 2003 | Clinical Sciences 2
Academic year:

2024
Views:

343

Pages:

2
Author:

Mariam A. A.

Skull (cranial and facial bones) Cranial bones Frontal bone - Unpaired (single) flat bone - Forms the top of the eye region (top of the orbits) Parietal bone - Paired bone (L and R) - Makes the walls and roofs of the cranial cavity - Foramen near the midline and a muscle marking on the left Occipital bone - Occiput means back of the head - Most of it is located on the cranial base - Large hole in the centre inferior part (foramen magnum) Temporal bone - Behind where the temples on the face are - Paired bone (L and R) - Muscle marking for attachments to the neck - Has an opening into the middle ear structure (external acoustic meatus) facing laterally - The line that goes to the pink part is called the zygomatic process (of the temporal bone) which travels anteriorly to the facial skeleton Facial bones Nasal - Paired bone Roof of the nasal cavity which connects it to the frontal bone - Makes up pretty much the whole face → gives face form Paired bone → fusion line is on the upper lip area Forms the sinus cavities, inferior margins of the eye (bottom of the orbits) and the lateral and inferior margins of the nasal cavity Many foramen for blood vessels and nerves for the muscles of facial expression and mastication Upper teeth are connected to this bone - maxillary dentitions Maxilla Zygomatic - Paired irregular bone Zygomatic means yoke - cross bar that connects a cow to a cart for transport It is the cross bar that connects the facial skeleton (maxilla) to the cranial cavity (temporal bone) Temporal process (of the zygomatic arch) fuses with the zygomatic process of the (temporal bone) → both of these fusing is the zygomatic arch Mandible - Unpaired irregular bone → 2 bones that fuse as the adult ages so it’s a singular bone - Mandible means to chew - Free bone - not permanently attached to the face or cranial cavity to allow movement - Connected through the temporomandibular joint (tells you what bones connect here) - Teeth connect here - mandibular dentitions Cranial sutures ● ● ● ● Where the bones join together in intramembranous ossification Sagittal = split in 2 (separates the left and right parietal bones) Coronal = crown (separates the frontal bone) Lambdoid suture (looks like the greek symbol lambda) = separates the occipital bone