ANATOMYEXAM2?s (Axial skeleton6-18)

Identify the recessed area surrounding the crista galli.

Cribriform plates -The paired cribriform plates surround the crista galli and contain the tiny olfactory foramina.

Which bone has both the cribriform plate and the crista galli?

Ethmoid Bone

(T/F) The ethmoid bone is a facial bone.

False -The ethmoid bone is part of the cranium.

(T/F) The ethmoid bone forms the inferior portion of the nasal septum.

False -The perpendicular plate of the ethmoid bone forms the superior part of the nasal septum.

Which of the following bones is unpaired? -Parietal -Zygomatic -Frontal -Temporal

Frontal -There is only one frontal bone. It forms the anterior portion of the cranium (the forehead region)

Identify the location of the ethmoid bone. -The lateral surface of the skull -The superior portion of the skull -In between the orbits -The floor of the skull

In between the orbits -The ethmoid bone is a single bone with a complex shape. The top of this bone projects up into the floor of the cranium. The middle of this bone spans the distance between the orbits, and the lowest most portion forms the superior part of the nasal septum.

Sternum labeled

Label of sternum

Which of the following bones do not contain a sinus? -Frontal -Sphenoid -Nasal -Maxillary

Nasal -The sinuses found in the skull are collectively known as the paranasal sinuses because they encircle the nasal cavity. The nasal bones are small tombstone shaped bones that form the bridge of the nose and don't contain sinuses.

Which part of the ethmoid bone forms the nasal septum?

Perpendicular plate -The perpendicular plate of the ethmoid bone forms the superior portion of the nasal septum. The inferior portion of the nasal septum is formed by the vomer.

Identify the primary function of the ethmoidal sinuses.

Reduce the weight of the skull -The paranasal sinuses are found in the ethmoid, sphenoid, frontal, and maxillary bones. They encircle the nasal cavity and function to lighten the skull.

Which ribs are considered false ribs?

Ribs 8-12 are false ribs -ribs 11 and 12 are a subset of false ribs and are called floating ribs.

Identify the suture found between the 2 parietal bones.

Sagittal suture -The parietal bones meet at midline on the top of the skull, forming the sagittal suture which runs along the midsagittal plane.

Which bone has "wings" and a body?

Sphenoid Bone

(T/F) The ethmoid bone is part of the axial skeleton.

The axial skeleton consists of the skull, vertebral column, and rib cage.

Identify the landmark that serves as a site of attachment for the meninges.

The crista galli -is a small plate-like projection visible in the anterior floor of the skull. The dura mater anchors to the crista galli, stabilizing the meninges and brain within the cranial cavity.

Which bone is NOT considered to be part of the cranium? -Ethmoid bone -Lacrimal bone -Sphenoid bone -Occipital bone

The lacrimal bone -is a tiny bone found in the medial portion of the orbit. It is a facial bone, not part of the cranium.

Identify the cranial nerve that passes through the olfactory foramina. -The olfactory nerve (CN I) -The optic nerve (CN II) -The oculomotor nerve (CN III) -The abducens nerve (CN VI)

The olfactory nerves (CN I) -pass through the olfactory foramina as they pass from the nasal cavity to the brain.

Which cranial bone spans the width of the cranial floor? View Available Hint(s) -Occipital -Temporal -Ethmoid -Sphenoid

The sphenoid bone -is the large bat shaped bone that spans the floor of the skull.

(T/F) The ethmoid bone contains sinuses.

True -The ethmoid sinuses are also known as ethmoidal air cells. They are found on either side of the perpendicular plate.

Which bone articulates with the dens?

atlas

You have identified the cause of death in an accident victim to be the result of the dens being forced into the brain. As you consider the anatomy, what other injury in this area would be likely? -fractured occipital bone -fractured atlas -fractured C3

fractured atlas -While any of the listed responses are possible, the atlas is comparatively very delicate and prone to fracture in a serious accident.

What is the function of the curvatures of the vertebral column?

increased flexibility -The curvatures give the vertebral column spring-like properties that make the column more flexible.

Quasimodo, the main character in Victor Hugo's The Hunchback of Notre Dame, suffered from -rickets. -lordosis. -kyphosis. -scoliosis.

kyphosis