Cranial and Facial Bones Anatomy

Flashcards testing knowledge on cranial and facial bones, their landmarks, and sutures based on lecture notes.

What is the mandible and how is its movement unique among skull bones?

The mandible (1) is the lower jawbone and is the only bone in the skull that moves.

What are the functions of the mandibular foramen and mental foramen?

The mandibular foramen consists of interior lateral holes for blood vessels, and the mental foramen is a pair of holes near the chin (mentum) for blood vessels.

What are the roles of the mandibular condyle and coronoid process?

The mandibular condyle articulates with the mandibular fossae, and the coronoid process provides a surface for muscle attachment.

What are the primary features of the maxilla bones?

The maxilla bones (2) form the upper jaw and contain the infraorbital foramen, which acts as a passage for nerves.

What is the anatomical function and connection of the zygomatic bones?

The zygomatic bones (2) help form the lateral wall of the eye orbits and connect to the zygomatic process.

What are the functions of the lacrimal bones and how do they relate to lacrimation?

The lacrimal bones (2) form the medial wall of each eye orbit and contain membranous lacrimal sacs, which cause runny noses during excessive crying (lacrimation).

What is the structure of the nasal bones?

The nasal bones (2) form the base structure of the nose; although commonly considered one bone, it is actually two bones sutured together.

Where is the vomer bone located?

The vomer bone (1) is a thin, medial band in the nasal cavity located anterior and inferior to the perpendicular plate of the ethmoid bone.

What is the function of the inferior nasal conchae, and why are the superior and middle conchae not classified as facial bones?

The inferior nasal conchae (2) attach to the lateral walls of the nasal cavity and cleanse inhaled air through mucus. The superior and middle nasal conchae are processes of the ethmoid bone, so they are not considered facial bones.

Where are the palatine bones located, and what condition is associated with their incomplete fusion with the maxilla?

The palatine bones (2) are located directly posterior to the maxilla bones. Incomplete fusion of the maxilla and palatine bones results in a condition called cleft palate.

What is a suture and what are the four major sutures in the cranium?

A suture is a fibrous joint incapable of moving that fuses two bones together. The four major sutures are: Sagittal (connects parietal bones), Squamous (connects temporal and parietal bones), Lambdoid (connects occipital and parietal bones), and Coronal (connects frontal and parietal bones).

What is the sphenoid bone and what structure on its superior side cradles the pituitary gland?

The sphenoid bone (1) forms the base, sides, and floors/walls of eye orbits, acting as a wedge between several bones. Its superior side contains the Sella Turcica ('Turkish Saddle'), which cradles the pituitary gland.

What are the key structures of the ethmoid bone and their respective functions?

The ethmoid bone (1) lies anterior to the sphenoid bone and forms most of the nasal cavity. Its Crista Galli ('Rooster crest') projects upwards for brain attachment, its perpendicular plate forms the nasal septum, and its superior and middle nasal conchae support mucous membranes in the nasal cavity.

What are the features and functions of the occipital bone?

The occipital bone (1) forms the back and base of the cranium. It contains the foramen magnum (central hole for the spinal cord) and occipital condyles (rounded projections lateral to the foramen magnum that articulate with the atlas).

What are the key features and functions of the temporal bones?

The temporal bones (2) form the sides of the skull and include: the external acoustic meatus (leads to ear canal), mandibular fossa (articulates with mandibular condyles), styloid process (anchors muscles from tongue), zygomatic process (articulates with zygomatic bones/cheek bones), and mastoid process (provides attachment surface for muscles).