These muscles act to move the hyoid up/down or forward/back. Stationery & Office Supplies. 7, include the following: - External acoustic meatus (ear canal)—This is the large opening on the lateral side of the skull that is associated with the ear. The anterior skull has the orbits that house the eyeballs and associated muscles. Lateral extensions of the sphenoid bone that form the bony lip separating the anterior and middle cranial fossae. This irregular space may be divided at the midline into bilateral spaces, or these may be fused into a single sinus space. Mastering A&P Chapter 7 -The Skeleton Art-labeling Activity: Figure 7.5a (2 of 3) Diagram. Watch this video to view a rotating and exploded skull with color-coded bones. The floor of the cranial cavity increases in depth from front to back and is divided into three cranial fossae; the anterior cranial fossa, middle cranial fossa, and posterior cranial fossa. The posterior aspect of the skull is formed by the parietal bone superolaterally, the temporal bone inferolateral, and the occipital bone centrally. The rounded cranium surrounds and protects the brain and houses the middle and inner ear structures.
Business Opportunities. The largest opening in the skull is the foramen magnum. On its outside surface, at the posterior midline, is a small protrusion called the external occipital protuberance, which serves as an attachment site for a ligament of the posterior neck. Small bump located at the midline on the posterior skull. They serve to reduce bone mass and thus lighten the skull, and they also add resonance to the voice. On the base of the skull, the occipital bone contains the large opening of the foramen magnum, which allows for passage of the spinal cord as it exits the skull. Art-labeling activity external view of the skull. Shaving & Hair Removal. In this view, the vomer is seen to form the entire height of the nasal septum.
Base of the skull (inferior view). Art-labeling activity external view of the skull and bones. This gap allows for communication between the nasal and oral cavities. This is the point of exit for a sensory nerve that supplies the nose, upper lip, and anterior cheek. The unpaired vomer bone, often referred to simply as the vomer, is triangular-shaped and forms the posterior-inferior part of the nasal septum (see Figure 7. The 22nd bone is the mandible (lower jaw), which is the only moveable bone of the skull.
Here the brainstem leaves the skull and becomes the spinal cord. Each parietal bone is also bounded anteriorly by the frontal bone at the coronal suture, inferiorly by the temporal bone at the squamous suture, and posteriorly by the occipital bone at the lambdoid suture. Paired bones that form the upper, lateral sides of the skull. Secretarial Services. Baby, Pregnancy & Maternity. Shallow depression in the anterior-medial wall of the orbit, formed by the lacrimal bone that gives rise to the nasolacrimal canal. It is formed by four bones; the frontal bone, the two parietal bones, and the occipital bone. Smallest and most superiorly located of the nasal conchae; formed by the ethmoid bone. The facial skeleton is referred to as all skull bones anteroinferior to the cranial cavity. Art-labeling activity external view of the skull free. Coffee & Tea Making. Gym & Fitness Equipment.
Small nerve branches from the olfactory areas of the nasal cavity pass through these openings to enter the brain. Restaurant & Catering. Foramen ovale - mandibular nerve. Foramina and contents.
Each of the paired zygomatic bones forms much of the lateral wall of the orbit and the lateral-inferior margins of the anterior orbital opening (see Figure 7. Extension from the temporal bone that forms the posterior portion of the zygomatic arch. The vomer bone forms the inferior and posterior parts of the septum. Other Clothing & Accessories. On the interior of the skull, the petrous portion of each temporal bone forms the prominent, vertical, diagonally oriented petrous ridge which rises from the posterior cranial fossa to the middle cranial fossa. 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. Below the orbit is the infraorbital foramen, which is the point of emergence for a sensory nerve that supplies the anterior face below the orbit. These are the medial pterygoid plate and lateral pterygoid plate (pterygoid = "wing-shaped"). The squamous suture is a curved suture located on the lateral side of the skull. It extends from the frontal bone anteriorly to the lesser wing of the sphenoid bone posteriorly. Smooth ridge located on the inferior skull, immediately anterior to the mandibular fossa. From above, we can see the ellipsoid-shaped part of the skull called the calvaria. Surgical repair is required to correct cleft palate defects.
Rounded corner located at outside margin of the body and ramus junction. The posterior projection is the mandibular condyles, which is topped by the oval-shaped condyle. Infratemporal fossa. Foramen spinosum—This small opening, located posterior-lateral to the foramen ovale, is the entry point for an important artery that supplies the covering layers surrounding the brain. Housing & Real Estate. Unpaired bone that forms the lower jaw bone; the only moveable bone of the skull. At its anterior midline, between the eyebrows, there is a slight depression called the glabella (see Figure 7. Locate the major suture lines of the skull and name the articulating bones that form them. Within the nasal cavity, the perpendicular plate of the ethmoid bone forms the upper portion of the nasal septum. Business Consulting. Architectural & Home Design. Software Development. Carotid canal—This is the zig-zag passageway through which a major artery to the brain enters the skull. Other Sporting Goods.
The frontal bone is thickened just above each supraorbital margin, forming rounded brow ridges. Large U-shaped notch located between the condylar process and coronoid process of the mandible. These are the paired parietal and temporal bones, plus the unpaired frontal, occipital, sphenoid, and ethmoid bones. Baby Carriers & Backpacks. Inside the nasal area of the skull, the nasal cavity is divided into halves by the nasal septum. Courier and Delivery.
Other Personal Care. Openings: anterior ethmoidal foramen, optic canal, cribriform foramina. Paired bony lines on the posterior skull that extend laterally from the external occipital protuberance. Extending from each lateral wall are the superior nasal concha and middle nasal concha, which are thin, curved projections (turbinates) that extend into the nasal cavity (Figure 7. Cargo Handling & Logistics. Wakeboarding & Waterskiing. Supraorbital foramen. Upper border of mandibular body that contains the lower teeth. This aspect of the skull contains a lot of important structures, including the largest skull foramen; the foramen magnum. This suture is named for its upside-down "V" shape, which resembles the capital letter version of the Greek letter lambda (Λ). The mandible has two openings, the mandibular foramen on its inner surface and the mental foramen on its external surface near the chin. Camera, Photo & Video. If an error occurs in these developmental processes, a birth defect of cleft lip or cleft palate may result.