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Anatomy & Physiology: Bones—Skull, Paranasal Sinuses.

Structure.

• Cavities near the nasal cavity that have a mucousal membrane lining that are continuous with nasal cavity lining.

Function.

• Lighten the weight of the skull.
• Increase area of nasal mucosa for filtering, warming, and moistening the air.

Clinical Significance.

Paranasal sinuses. Used with permission by 3D4Medical.

References

Biel, A. (2015). Trail guide to the body: A hands-on guide to locating muscles, bones and more.

Jenkins, G., & Tortora, G. J. (2012). Anatomy and Physiology: From Science to Life, 3rd Edition International Stu. John Wiley & Sons.

Muscolino, J. E. (2017). The muscular system manual: The skeletal muscles of the human body.

Download these notes.

Anatomy & Physiology: Bones—Skull, Palatine Bones.

Structure.

• Pair of bones that are L-shaped and form the posterior end of the hard palate, and part of the floor and side walls of the nasal cavity, and part of the orbital floor.

Function.

Clinical Significance.

Palatine. Used with permission by 3D4Medical.

References

Biel, A. (2015). Trail guide to the body: A hands-on guide to locating muscles, bones and more.

Jenkins, G., & Tortora, G. J. (2012). Anatomy and Physiology: From Science to Life, 3rd Edition International Stu. John Wiley & Sons.

Muscolino, J. E. (2017). The muscular system manual: The skeletal muscles of the human body.

Download these notes.

Anatomy & Physiology: Bones—Skull, Orbits.

Structure.

• The orbit is formed from 7 bones: cranial bones frontal, sphenoid and ethmoid; facial bones palatine zygomatic, lacrimal, and maxilla.
• Each orbit has 5 openings: supraorbital foramen (supraorbital margin of frontal bone); optic foramen (sphenoid); superior orbital fissure between the sphenoid, zygomatic, and maxilla; the lacrimal fossa (lacrimal bone).

Function.

Clinical Significance.

Orbits. Used with permission by 3D4Medical.

References

Biel, A. (2015). Trail guide to the body: A hands-on guide to locating muscles, bones and more.

Jenkins, G., & Tortora, G. J. (2012). Anatomy and Physiology: From Science to Life, 3rd Edition International Stu. John Wiley & Sons.

Muscolino, J. E. (2017). The muscular system manual: The skeletal muscles of the human body.

Download these notes.

Anatomy & Physiology: Bones—Skull, Occipital Bone.

Structure.

• Forms the back of the head, most of the cranial floor and foramin magnum (where the medulla oblongata connects with the spinal cord; vertebral and spinal arteries also pass through this hole).
• The occipital condyles are ovalish convex “stumps” that articulate with C1 (atlas; remember in Greek mythology that Atlas held up the sky or in this case, the skull). This articulation allows the head to nod (like when a person nods “yes”).
• Hypoglosssal canal: a foramen interior of the skull, superior to the occipital condyles, allowing for the hypoglossal nerve to pass through that controls tongue movement.
• External occipital protuberance: inferior to the lambdoid suture, the external occipital protuberance may feel like a “bump”. From a midsagittal cross-sectional view, it looks like a “gentle hill”; it is not sharp nor pointy. It is the thickest area of the occipital.
• Superior nuchal line: extending bilaterally from the external occipital protuberance, a horizontal “line”. Provides attachment points for muscles.
• Inferior nuchal line: similar to the superior nuchal line but inferior to it; extends bilaterally from the external occipital protuberance, a horizontal “line”. Provides attachment points for muscles.

Function.

Clinical Significance.

Occipital. Used with permission by 3D4Medical.

References

Biel, A. (2015). Trail guide to the body: A hands-on guide to locating muscles, bones and more.

Jenkins, G., & Tortora, G. J. (2012). Anatomy and Physiology: From Science to Life, 3rd Edition International Stu. John Wiley & Sons.

Muscolino, J. E. (2017). The muscular system manual: The skeletal muscles of the human body.

Download these notes.

Anatomy & Physiology: Bones—Skull, Nasal Bones.

Structure.

• The pair of nasal bones are small, flat and rectangular. They form the nose bridge.
• They protect the entry to the nasal cavity and serve as attachment points.

Function.

Clinical Significance.

Nasal bones. Used with permission by 3D4Medical.

References

Biel, A. (2015). Trail guide to the body: A hands-on guide to locating muscles, bones and more.

Jenkins, G., & Tortora, G. J. (2012). Anatomy and Physiology: From Science to Life, 3rd Edition International Stu. John Wiley & Sons.

Muscolino, J. E. (2017). The muscular system manual: The skeletal muscles of the human body.

Download these notes.

Anatomy & Physiology: Bones—Skull, Maxilla.

Structure.

• The pair of maxillae form the upper jawbone.
• The maxillae articulate with every facial bone except the lower jawbone, the mandible.
• Forms the floor of the orbits, part of the lateral and inferior nasal walls, and a large portion of the hard palate.
• Hard palate: bony roof of mouth. The palantine processes of the maxillae form most of the hard palate along with horizontal plates of the palantine bones (separate from the maxillae). The hard palate separates the nasal and oral cavities.
• Maxillary sinus empties into nasal cavity.
• Alveolar processes: ridge that contains the sockets (alveoli) for the upper teeth.
• Palantine processes: horizontal projection forming anterior of hard palate.
• Infraorbital foramen: passageway for facial nerve.
• Incisive foramen: allows passageway for nerve and blood vessels to the hard palate.
• Inferior orbital fissure: passateway for nerves and vessels to the face.

Function.

• Upper jaw bone helps to break down food when eating.

Clinical Significance.

Maxilla. Used with permission by 3D4Medical.

References

Biel, A. (2015). Trail guide to the body: A hands-on guide to locating muscles, bones and more.

Jenkins, G., & Tortora, G. J. (2012). Anatomy and Physiology: From Science to Life, 3rd Edition International Stu. John Wiley & Sons.

Muscolino, J. E. (2017). The muscular system manual: The skeletal muscles of the human body.

Download these notes.

Anatomy & Physiology: Bones—Skull, Mandible.

Structure.

• Lower jawbone is the largest and strongest of the facial bones.
• The only freely moving skull bone.
• Consists of: the body and rami (perpendicular portions).
• Mandibular angle: where the ramus meets the mandibular body.
• Condylar process: of each rami; articulates with mandibular fossa of temporal bone. Forms the temporomandibular joint (TMJ).
• Coronoid process: where temporalis (muscle) attaches.
• Mandibular notch: a depression between the condylar process and coronoid process.
• Alveolar process: is a slightly raised arch (more like a very small ridge) which contains the sockets (alveoli) for teeth in the lower jaw bone.
• Mental foramen: “ment” = chin. This is where dentists inject anesthesia.
• Mandibular foramen: located on the interior surface; inferior and between the condylar process and coronoid process. This is where dentists inject anesthesia. This foramen is a passageway for nerve and blood vessels supplying the teeth in the lower jaw bone.

Function.

• To break down food when eating.

Clinical Significance.

Mandible. Used with permission by 3D4Medical.

References

Biel, A. (2015). Trail guide to the body: A hands-on guide to locating muscles, bones and more.

Jenkins, G., & Tortora, G. J. (2012). Anatomy and Physiology: From Science to Life, 3rd Edition International Stu. John Wiley & Sons.

Muscolino, J. E. (2017). The muscular system manual: The skeletal muscles of the human body.

Download these notes.

Anatomy & Physiology: Bones—Skull, Lacrimal Bone.

Structure.

• The name “lacrimal” means tear or tear-drop
• The pair of bones that are about the size of a fingernail on either side of the the nasal bones, forming part of the medial orbital wall.
• Lacrimal fossa: a vertical passageway (also formed with the maxilla) for tears to pass into the nasal cavity.

Function.

Clinical Significance.

Lacrimal. Used with permission by 3D4Medical.

References

Biel, A. (2015). Trail guide to the body: A hands-on guide to locating muscles, bones and more.

Jenkins, G., & Tortora, G. J. (2012). Anatomy and Physiology: From Science to Life, 3rd Edition International Stu. John Wiley & Sons.

Muscolino, J. E. (2017). The muscular system manual: The skeletal muscles of the human body.

Download these notes.

Anatomy & Physiology: Bones—Skull, Inferior Nasal Conchae.

Structure.

• Pair of bones that are separate from the middle and superior nasal conchae on the ethmoid bone.

Function.

• Helps to swirl, warm and moisten the air, trap particles via the mucous.

Clinical Significance.

Inferior nasal concha. Used with permission by 3D4Medical.

References

Biel, A. (2015). Trail guide to the body: A hands-on guide to locating muscles, bones and more.

Jenkins, G., & Tortora, G. J. (2012). Anatomy and Physiology: From Science to Life, 3rd Edition International Stu. John Wiley & Sons.

Muscolino, J. E. (2017). The muscular system manual: The skeletal muscles of the human body.

Download these notes.

Anatomy & Physiology: Bones—Skull, Frontal Bone.

Structure.

• Forms the forehead; eyebrow ridge (supraorbital margin); and the roofs of the eye socket/orbits; and part of the cranial cavity floor.
• Metopic suture: formed when left and right halves join soon after birth; disappears when child is 6-8 yrs old.
• Supraorbital margin: brow ridge. Bone is thicker in this area.
• Supraorbital foramen: hole for the nerves of the eyebrow and eyelid.
• Frontal sinuses: deep to the frontal bone.
• Forms part of the coronal suture.

Function.

Clinical Significance.

Frontal. Used with permission by 3D4Medical.

References

Biel, A. (2015). Trail guide to the body: A hands-on guide to locating muscles, bones and more.

Jenkins, G., & Tortora, G. J. (2012). Anatomy and Physiology: From Science to Life, 3rd Edition International Stu. John Wiley & Sons.

Muscolino, J. E. (2017). The muscular system manual: The skeletal muscles of the human body.