Gross Anatomy - Anatomy

The second '2' in the 2:1:2:3 dental formula of a modern human adult refers to premolars. There are two premolars, situated between the canine and molars, in each of the four quadrants in a modern human adult, for a total of eight of this type of tooth per individual. Primitive mammals have four pre-molars; in the line of evolution leading to humans, the first two premolars were lost, leaving the third and fourth.

The '3' in the 2:1:2:3 dental formula of a modern human adult refers to molars: first, second, and third, or wisdom tooth (even though the wisdom tooth is indeed a molar, it is only one of three molars per quadrant). In some individuals, this third molar is not present in some or all quadrants. These teeth are situated furthest back in the dental arcade, behind the premolars.

The sagittal suture is the long suture that runs between the two parietal bones, running antero-posteriorally along the top of the cranium.

The coronal suture runs laterally from the top of the cranium and ties together the frontal and two parietal bones. The lambdoidal suture ties together the occipital and two parietal bones on the posterior cranium. The squamosal suture is the area where the squamosal section of the temporal bone is beveled and overlaps the parietal bone. The basilar suture, also referred to as spheno-occipital synchondrosis, is a suture between the occipital and sphenoid bones.

The coronal (frontal) suture runs laterally from the top of the cranium and ties together the frontal and two parietal bones.

The sagittal suture runs along the top of the cranium, between the two parietal bones. The lambdoidal suture ties together the occipital and two parietal bones on the posterior cranium. The squamosal suture is the area where the squamosal section of the temporal bone is beveled and overlaps the parietal bone. The basilar suture, also referred to as spheno-occipital synchondrosis, is a suture between the occipital and sphenoid bones.

The lambdoidal suture ties together the occipital and two parietal bones on the posterior cranium.

The sagittal suture runs along the top of the cranium, between the two parietal bones. The coronal suture runs laterally from the top of the cranium and ties together the frontal and two parietal bones. The squamosal suture is the area where the squamosal section of the temporal bone is beveled and overlaps the parietal bone. The basilar suture, also referred to as spheno-occipital synchondrosis, is a suture between the occipital and sphenoid bones.

The squamosal suture is the area where the squamosal section of the temporal bone is beveled and overlaps the parietal bone.

The sagittal suture runs along the top of the cranium, between the two parietal bones. The coronal suture runs laterally from the top of the cranium and ties together the frontal and two parietal bones. The lambdoidal suture ties together the occipital and two parietal bones on the posterior cranium. The basilar suture, also referred to as spheno-occipital synchondrosis, is a suture between the occipital and sphenoid bones.

The correct answer is the coronal suture. It joins as a child develops and divides the frontal and parietal bones. The squamous suture separates the temporal and the parietal bones. The lambdoid suture separates the parietal and occipital bones. The zygomatic and occipital sutures do not exist.

The correct answer is the squamous suture. It joins as a child develops and divides the temporal and parietal bones. The coronal suture separates the frontal bone and the parietal bones. The lambdoid suture separates the parietal and occipital bones. The zygomatic and occipital sutures do not exist.

The correct answer is the lambdoid suture. It joins as a child develops and divides the parietal and the occipital bones. The coronal suture separates the frontal and the parietal bones. The squamous suture separates the temporal and the parietal bones. The zygomatic and occipital sutures do not exist.

The bone that makes up your "forehead" is the frontal bone because it is the most anterior bone of the skull and is the underlying bone of the forehead. The parietal bone are posterior to the frontal bone and do not make up the forehead. The occipital bone is the most posterior bone of the skull and the zygomatic bone is inferior to the frontal bone and makes up the "cheek bone."

The "cheek bone" is the zygomatic bone and therefore is the correct answer. The occipital bone is in the back of the head. The frontal bone makes up the "forehead." The parietal bone is in the middle of the skull, posterior to the frontal bone but anterior to the occipital bone. The temporal bone is on the side of the head and is located inferior to the parietal bone.

The bone anterior to the parietal bone is the frontal bone. The occipital bone is posterior to the parietal bone. The temporal bone is inferior to the parietal bone.The zygomatic bone is antero-inferior to the parietal bone and is not directly anterior to it. The mandible is inferior to it and makes up the lower portion of the jaw.

The bone posterior to the parietal bone is the occipital bone. The frontal bone is anterior to the parietal bone. The temporal bone is inferior to the parietal bone. The zygomatic bone is antero-inferior to the parietal bone and is not directly anterior to it. The mandible is inferior to it and makes up the lower portion of the jaw.

The bone directly anterior to the temporal bone is the sphenoid bone. The frontal bone supero-anterior to the temporal bone but is not directly anterior to the temporal bone. The parietal bone is superior to the temporal bone. The occipital bone is posterior to the temporal bone. The mandible is inferior to the temporal bone.

The occipital bone is directly posterior the temporal bone and is the correct answer. The sphenoid bone is directly anterior to the temporal bone. The frontal bone is supero-anterior to the temporal bone. The parietal bone is superior to the temporal bone. The mandible is inferior to the temporal bone.

The mandible is directly inferior to the temporal bone and connects to it. The sphenoid bone is directly anterior to the temporal bone. The frontal bone is supero-anterior to the temporal bone. The parietal bone is superior to the temporal bone. The mandible is inferior to the temporal bone.

The frontal bone is directly superior to the nasal bone when looking at the skull "face on." The Maxilla is directly inferior to the nasal bone. The mandible is inferior to the maxilla and therefore is inferior to the nasal bone. The parietal bone is superior to the nasal bone, but is posterior to the frontal bone and therefore it is not directly superior to the nasal bone. The occipital bone is located on the back of the skull and is therefore not directly superior to the frontal bone.

The maxilla is directly medial to the zygomatic bone. The mandible is inferior to the zygomatic bone. The frontal bone is superior to the zygomatic bone. The occipital bone is in the back of the skull and is therefore not directly medial to the zygomatic bone. The temporal bone is posterior to the zygomatic bone.

The optic canal is also referred to as the optic foramen. It is a short canal through the lesser wing of the sphenoid bone. The optic canal transmits the optic nerve (cranial nerve II) and the ophthalmic artery into the orbital cavity.