Skull Anatomy

OML

Orbitomeatal Line

The organs of hearing are located in the ______ bone.

Temporal

List the three classifications of fundamental skull shapes and indicate the number of degrees of angulation (formed by the petrous pyramids and the midsagittal plane) for each classification.

-Dolichocephalic (40 degrees) (Long and Narrow head) -Mesochepalic (47 degrees) (Average) -Brachycephalic (54 degrees) (Flat & Short head)

The orbit consists of _____ cranial bones and _____ facial bones.

3;4

AML

Acanthiomeatal Line

Midpoint of the anterior nasal spine

Acanthion

The radiographically significant landmark that is the midpoint of the anterior nasal spine is the _______.

Acanthion

The thick ridge on the inferior border of the maxillary bone that supports the teeth is the ___________.

Alveolar Process

The fibrocartilaginous, oval-shaped portion of the external ear is the ______.

Auricle

The portion of the occipital bone that projects anteriorly from the foramen magnum is the _______ portion.

Basilar

The fontanelles located at the junction of the coronal and sagittal sutures is the _____.

Bregma

The two fontanelles located on the midsagittal plane of the skull are the ______ and the _____.

Bregma, Lambda

The structure that articulates with the occipital condyles is the __________.

C1 Vertebra (Atlas)

The part of the mandible that articulate with the mandibular fossa of the temporal bone to form the temporomandibular joint is the ________.

Condyle

The two processes that extend superiorly from a mandibular ramus are the ______ and the _______ process.

Condyle; Coronoid

The two parietal bones articulate with the frontal bone to form the _____ suture.

Coronal

The inner layer of spongy tissue found inside the cranial bones is called _____.

Diploe

The prominent bulge of a parietal bone is called the parietal _____.

Eminence

The cranial bone located between the orbits and posterior to the nasal bones is the _______ bone.

Ethmoid

The bones of the cranial vault are classified as ____ bones.

Flat

The large opening of the occipital bone through which part of the medulla oblongata passes is the ______.

Foramen Magnum

The bone that forms the anterior portion of the cranium is the _____.

Frontal

List the cranial bones by name and quantity. Total Number?

Frontal (1), Ethmoid (1), Parietal (2), Sphenoid (1), Temporal (2), Occipital (1). 8 Total.

The lateral wall of the orbit is comprised by the ______ and _______ bones.

Frontal; Zygoma

Smooth elevation between the superciliary arches

Glabella

GML

Glabellomeatal Line

Angle of the mandible; lateroposterior aspect of the mandible

Gonion

The U-shaped bone located at the base of the tongue is the ______ bone.

Hyoid

The scroll-like bony tissues that extend along the lateral walls of the nasal cavity are the _____________________.

Inferior Nasal Conchae

IOML

Infraorbitalmeatal Line

Posterior Surface of the Occipital bone

Inion

IAM

Internal Acoustic Meatus

IPL

Interpupillary Line

The ______ facial bone is located on the inferior medial wall of the orbit.

Lacrimal

The anterior portion of the medial walls of the orbits is formed by the ______ bones.

Lacrimal

The fontanelle located at the junction of the lambdoidal and sagittal sutures is the ____.

Lambda

The two parietal bones and the occipital bone join together to form the ______ suture.

Lambdoidal

The three auditory ossicles are the ______, the ______, and the _______.

Malleus (hammer), Incus (anvil), and the Stapes (stirrup)

The largest and densest bone of the face is the ______.

Mandible

The process of the temporal bone that encloses radiographically significant air cells is the ______ process.

Mastoid

The largest of the immovable bones of the face is the ______ bone.

Maxilla

The inferior border of the orbit consists of the _____ and ______ bones.

Maxilla; Zygoma

The anterior nasal spine projects superiorly from the ______.

Maxillae

The body of each maxilla contains a large, pyramidal cavity called the _________.

Maxillary Sinus

Midpoint of the mental protuberance; anterior aspect of the mandible; where the two mandibular bodies join together

Mental Point

MML

Mentomeatal Line

The facial bones that form the bridge of the nose are the ______ bones.

Nasal

List the facial bones by name and quantity. Total Number?

Nasal (2), Lacrimal (2), Maxillae (2), Zygomatic (2), Palatine (2), Nasal Conchae (2), Vomer (1), Mandible (1). 14 Total.

Midpoint of the frontonasal suture

Nasion

The cranial bone that forms posteroinferior portion of the cranium is the ______ bone.

Occipital

The two parietal bones articulate posteriorly with the _______ bone.

Occipital

Lateral aspect of each orbit; where the two eyelids originate

Outer Canthus

The ______ facial bone is located at the apex of the orbit.

Palatine

The facial bones that form the posterior one fourth of the roof of the mouth are the ______ bones.

Palatine

The cranial bones that form the vertex and most of the sides of the cranium are the _____ bones.

Parietal

The thickest and densest portion of the bone in the cranium is the ___________.

Petrous Portion (Pars Petrousa & Petrous Pyramids)

The portion of the mandible that extends superiorly from the posterior aspect of the mandibular body is the _______.

Ramus

The two parietal bones join together to form the _____ suture.

Sagittal

The basilar portion of the occipital bone fuses anteriorly with the body of the _______ bone.

Sphenoid

The cranial bone that provides a depression to house the pituitary gland is the ______ bone.

Sphenoid

The middle portion of the cranial base is formed by the ________ bone.

Sphenoid

Raised prominence just above each orbit on the frontal bone; coincide with the eyebrows

Superciliary Arch

The bone that forms part of the cranial base between the greater wings of the sphenoid bone and the occipital bone is the ______ bone.

Temporal

The petrous portion is a part of the ______ bone.

Temporal

The zygomatic process projects anteriorly from the ______ bone.

Temporal

TEA

Top of Ear Attachment

The structure that separates the external acoustic meatus (EAM) from the auditory ossicles is the _________ membrane.

Tympanic

Superior aspect of the cranium; where the parietal bones join together

Vertex

The facial bone forming the inferior part of the nasal septum is the ________.

Vomer

The facial bones that form the inferolateral portion of the orbital margin are the ______ bones.

Zygomatic

The facial bones that form the prominence of the cheeks are the ______ bones.

Zygomatic

The bones of the skull are divided into two major groups, the _____ bones and the _____ bones.

cranial;facial