The muscle that forms the floor of the oral cavity attaches to the mylohyoid lines on both sides of the mandible. Define the paranasal sinuses and identify the location of each. It unites the squamous portion of the temporal bone to the parietal bone.
The occipital bone is the single bone that forms the posterior skull and posterior cranial fossa (Figure 7. The frontal bone, the parietal bone, the greater wing of the sphenoid bone, and the squamous part of the temporal bone meet at the pterion, forming the floor of the temporal fossa. Art-labeling activity external view of the skull without. Inferior margin of anterior mandible that forms the chin. These twisting lines serve to tightly interlock the adjacent bones, thus adding strength to the skull to protect the brain.
Nerves to the eyeball and associated muscles, and sensory nerves to the forehead pass through this opening. The right and left medial pterygoid plates form the posterior, lateral walls of the nasal cavity. The narrow gap between the bones is filled with dense, fibrous connective tissue that unites the bones. The rounded depression in the floor of the sella turcica is the hypophyseal (pituitary) fossa, which houses the pea-sized pituitary (hypophyseal) gland. A ligament that anchors the mandible during opening and closing of the mouth extends down from the base of the skull and attaches to the lingula. The interior space that is almost completely occupied by the brain is called the cranial cavity. Air-filled space located with each maxillary bone; largest of the paranasal sinuses. Attached to the lateral wall on each side of the nasal cavity are the superior, middle, and inferior nasal conchae (singular = concha), which are named for their positions (see Figure 7. They serve to reduce bone mass and thus lighten the skull, and they also add resonance to the voice. Located just above the inferior concha is the middle nasal concha, which is part of the ethmoid bone. Mastering A&P Chapter 7 -The Skeleton Art-labeling Activity: Figure 7.5a (2 of 3) Diagram. Curved, inferior margin of the maxilla that supports and anchors the upper teeth. Mandibular fossa—This is the deep, oval-shaped depression located on the external base of the skull, just in front of the external acoustic meatus. Define and list the bones that form the cranium or support the facial structures. These are paired and located within the right and left maxillary bones, where they occupy the area just below the orbits.
It is located within the body of the sphenoid bone, just anterior and inferior to the sella turcica, thus making it the most posterior of the paranasal sinuses. Middle part: the sphenoid bone, petrous processes of the temporal bones, and the basilar part of the occipital bone. Art-labeling activity external view of the skull base. A much smaller portion of the vomer can also be seen when looking into the anterior opening of the nasal cavity. The most common is a linear skull fracture, in which fracture lines radiate from the point of impact. Medial pterygoid plate.
Lateral to either side of this bump is a superior nuchal line (nuchal = "nape" or "posterior neck"). The anterior skull consists of the facial bones and provides the bony support for the eyes, teeth and structures of the face and provides openings for eating and breathing. Thus, to numb the lower teeth prior to dental work, the dentist must inject anesthesia into the lateral wall of the oral cavity at a point prior to where this sensory nerve enters the mandibular foramen. Further important structures are the: Anterior (frontal) view. Art-labeling activity external view of the skull is found. The hyoid is held in position by a series of small muscles that attach to it either from above or below. Each orbit is cone-shaped, with a narrow posterior region that widens toward the large anterior opening. This blockage can also allow the sinuses to fill with fluid, with the resulting pressure producing pain and discomfort. Software Development. Extension from the temporal bone that forms the posterior portion of the zygomatic arch. All the openings of the skull that provide for passage of nerves or blood vessels have smooth margins; the word lacerum ("ragged" or "torn") tells us that this opening has ragged edges and thus nothing passes through it.
The lateral portions of the ethmoid bone are located between the orbit and upper nasal cavity, and thus form the lateral nasal cavity wall and a portion of the medial orbit wall. Inside the mouth, the palatine processes of the maxilla bones, along with the horizontal plates of the right and left palatine bones, join together to form the hard palate. Paired bony lines on the posterior skull that extend laterally from the external occipital protuberance. The crista galli ("rooster's comb or crest") is a small upward bony projection located at the midline. Students also viewed. Mental foramen—The opening located on each side of the anterior-lateral mandible, which is the exit site for a sensory nerve that supplies the chin. This is the point of exit for a sensory nerve that supplies the nose, upper lip, and anterior cheek. Flattened upward projection from the anterior margin of the mandibular ramus. Announcements & Events.
The Nasal Septum and Nasal Conchae. It is the weakest part of the skull. It is the exit point for a major sensory nerve that supplies the cheek, nose, and upper teeth. These are located just behind your eyebrows and vary in size among individuals, although they are generally larger in males. The superior nasal concha is located just lateral to the perpendicular plate, in the upper nasal cavity. Thus the temporal process (anteriorly) and the zygomatic process (posteriorly) join together, like the two ends of a drawbridge, to form the zygomatic arch. The plates from the right and left palatine bones join together at the midline to form the posterior quarter of the hard palate (see Figure 7. Learning Objectives. The lambdoidal suture (running horizontally between the occipital bone and both parietal bones). At its anterior midline, between the eyebrows, there is a slight depression called the glabella (see Figure 7. Cavities within the skull that are connected to the conchae that serve to warm and humidify incoming air, produce mucus, and lighten the weight of the skull; consist of frontal, maxillary, sphenoidal, and ethmoidal sinuses. It is subdivided into the rounded top of the skull, called the calvaria, and the base of the skull.
Interior space of the skull that houses the brain. The sphenoid sinus is a single, midline sinus. Sets found in the same folder. Strollers & Walkers. C) Estimate the cost of batteries. The sagittal suture (dividing both the parietal bones). Fen Motor Maraamathukurun.
The medial floor is primarily formed by the maxilla, with a small contribution from the palatine bone. Coronoid process of the mandible. Also, maxilla) paired bones that form the upper jaw and anterior portion of the hard palate. The mandible has two openings, the mandibular foramen on its inner surface and the mental foramen on its external surface near the chin. Downward projecting, elongated bony process located on the inferior aspect of the skull. Storage & Organization. Large opening in the occipital bone of the skull through which the spinal cord emerges and the vertebral arteries enter the cranium.
On the posterior skull, the sagittal suture terminates by joining the lambdoid suture at the intersection called lambda. Camera, Photo & Video. A third bony plate, also part of the ethmoid bone, is the superior nasal concha. Openings: anterior ethmoidal foramen, optic canal, cribriform foramina. Electronic Components & Supplies. Opening located on anterior skull, at the superior margin of the orbit. The frontal bone is found superiorly while the mandible lies inferiorly, giving the skull an ovoid shape when looked at anteriorly.
This second feature is most obvious when you have a cold or sinus congestion which causes swelling of the mucosa and excess mucus production, obstructing the narrow passageways between the sinuses and the nasal cavity and causing your voice to sound different to yourself and others. Lateral View of Skull. The orbit is the bony socket that houses the eyeball and contains the muscles that move the eyeball or open the upper eyelid. Foramina and contents. Describe the parts of the nasal septum in both the dry and living skull. Identify the bony openings of the skull. The largest sinus is the maxillary sinus. Perfect to use as a quiz, in class, or homework assignment. Pets and Pet Supplies.
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