In comparing the impact strength of three facial bones on each of four cadavers, the frontal bone has been found to tolerate a force three or four times higher than the mandible and zygomatic bone which are about equal.
There may not be sufficient evidence at this time supporting this idea. However, there is much more research showing that there the bones of the head can than there is research showing that the bones of the head do not move.
Cranial base - comprised of six bones: frontal, sphenoid, ethmoid, occipital, parietal and temporal. These bones articulate with the 1st cervical vertebra (atlas), the facial bones, and the mandible (jaw).
The frontal bone forms the front of the skull and is divided into three parts: Squamous: This part is large and flat and forms the main region of the forehead. Orbital: This part lies inferiorly and forms the superior border of the orbit.
It was observed in our study that thickness of frontal and occipital bones of skull bones varied from 3 mm to 14 mm ,with an average of 8mm; an average thickness of 4mm was observed for temporal bones on both sides.
Your mandible, or jawbone, is the largest, strongest bone in your face.
The temporal bone is a thick, hard bone that forms part of the side and base of the skull. This bone protects nerves and structures in the ear that control hearing and balance.
The nasal bones are two small oblong bones, varying in size and form in different individuals; they are placed side by side at the middle and upper part of the face, and form, by their junction, “the bridge” of the nose.
There are three general classes of
bone markings: (1) articulations, (2) projections, and (3) holes. As the name implies, an articulation is where two
bone surfaces come together (articulus = “joint”).
Learning Objectives.
| Bone Markings (Table 7.2) |
|---|
| Marking | Description | Example |
|---|
| Fissure | Slit through bone | Auricular fissure |
A fossa (from the Latin "fossa", ditch or trench) is a depression or hollow, usually in a bone, such as the hypophyseal fossa, the depression in the sphenoid bone. A fovea (Latin: pit) is a small pit, usually on the head of a bone. An example of a fovea is the fovea capitis of the head of the femur.
In anatomy, a process (Latin: processus) is a projection or outgrowth of tissue from a larger body.
To resist these forces, bones have enlarged bony landmarks at sites where powerful muscles attach. This means that not only the size of a bone, but also its shape, is related to its function. For this reason, the identification of bony landmarks is important during your study of the skeletal system.
A condyle (/ˈk?nd?l/ or /ˈk?nda?l/; Latin: condylus, from Greek: kondylos; κόνδυλος knuckle) is the round prominence at the end of a bone, most often part of a joint - an articulation with another bone.
| MARKING |
|---|
| Foramen | Opening (hole) through which blood vessels, nerves or ligaments pass |
| Fossa | Shallow depression |
| Sulcus | Furrow or groove along a bone surface that accommodates a blood vessel, nerve or tendon |
| Meatus | Tube-like opening (passageway) |
A hole is an opening or groove in the bone that allows blood vessels and nerves to enter the bone.
Bone protrusions are divided into two groups: articular and non-articular. Non-articular eminences are located along the bone shaft and termed according to their form. Thus, a rough elevation that stretches along the surface is termed a ridge or crest, whereas a broad, rough, irregular ridge is called a tuberosity.
The large facial bones that surround the nasal cavity - the frontal bone, the maxilla, the sphenoid and ethmoid bones - are hollow to a greater or lesser extent. The hollow spaces in these bones contain the paranasal sinuses, which in the healthy living body are filled with air.
Examples include supraorbital foramen, infraorbital foramen, and mental foramen on the cranium. Fossa - A shallow depression in the bone surface. Examples include trochlear fossa, posterior, middle, and anterior cranial fossa.
Tuberosity. large rounded projection, may be roughened. Crest. narrow ridge of bone, usually prominent. Trochanter.
What markings found on bones are indicative of nerve pathways? Ridges.
21 Cards in this Set
| which of the following lists contains only facial bones? a. mandible, maxilla, nasal, zygomatic b. frontal, occipital, zygomatic, parietal c. occipital, sphenoid, temporal, lacrimal d.frontal, parietal, occipital, sphenoid | a |
|---|
| Blood vessels that drain blood from the head pass through the | jugular foramina |
Markings of the Sternum:Jugular (suprasternal) notch – depression between the two clavicular notches.
A trochanter is a tubercle of the femur near its joint with the hip bone. In humans and most mammals, the trochanters serve as important muscle attachment sites.
| Trochanter |
|---|
| FMA | 82513 |
| Anatomical terminology |
The temporal bones are situated at the sides and base of the skull, and lateral to the temporal lobes of the cerebral cortex. The temporal bones are overlaid by the sides of the head known as the temples, and house the structures of the ears.
Human Anatomy - Bone Markings - Anatomical Terms
| Question | Answer |
|---|
| tubercle (projections for tendon and ligament attachment) | small, round projection |
| tuberosity (projections for tendon and ligament attachment) | large, rough projection |
| canal (meatus) (openings and spaces) | passageway through a bone |
The brow ridge, or supraorbital ridge known as superciliary arch in medicine, refers to a bony ridge located above the eye sockets of all primates. In Homo sapiens sapiens (modern humans) the eyebrows are located on their lower margin.
| Brow ridge |
|---|
| FMA | 52850 |
| Anatomical terms of bone |
The eye socket, or orbit, is the bony cup surrounding your eye. Seven different bones make up the socket. The eye socket contains your eyeball and all the muscles that move it.
The maxilla is the bone that forms your upper jaw. The right and left halves of the maxilla are irregularly shaped bones that fuse together in the middle of the skull, below the nose, in an area known as the intermaxillary suture. The maxilla is a major bone of the face.
Frontal bone: This bone comprises the forehead (squama frontalis) and the upper orbit of the eye (pars orbitalis). Two temporal bones: These bones are located at the sides and base of the skull, and they are the hardest bones in the body.
The mammalian skull vault consists of several membrane bones with different origins. A pair of frontal bones, which occupies the anterior part of the skull vault, is derived from cranial neural crest cells. The frontal bone primordium develops at the superciliary ridge region, then expands towards the top of the head.
A type of paranasal sinus (a hollow space in the bones around the nose). There are two, large frontal sinuses in the frontal bone, which forms the lower part of the forehead and reaches over the eye sockets and eyebrows. The frontal sinuses are lined with cells that make mucus to keep the nose from drying out.
