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Speech Pathology 2

Bones of the Skull

QuestionAnswer
Definition of Suture? Immovable joints that form the articulation point for bones of the cranial skeleton
What are the two divisions of the bones of the skull? Facial Skeleton and Cranial Skeleton
True or False: The mandible begins as a paired bone, but fuses into a single bone early in life. True: this facial bone begins as a paired bone, but fuses into a single bone early in life
What are the parts of the Mandible? [BAARCC];Body, Alveolar arch, Angle, Ramus, Coronoid Process, and the Condylar Process
What is the alveolar arch? Ridge of the mandible that houses the teeth
What is the "angle" of the mandible? Point on the mandible where the arch stops and changes direction
Describe the ramus of the mandible Part of mandible that is a superior, lateral, and posterior projection of the arch
Describe the coronoid process of the mandible Anterior process at the top of the ramus; point of muscle attachment
Describe the condylar process of the mandible Posterior process at the top of the ramus; point of articulation with the temporal bone at the temporomandibular joint (TMJ)
What facial structures does maxillae contribute to the formation of? The roof of the mouth, the floor and lateral walls of the nasal cavity, and the floor of the orbits
Which bony processes are included in maxillae? This area of paired bone includes the Zygomatic Process, Frontal Process, Palatine Process, Alveolar Process
Describe the location and articulation point of the zygomatic process of maxillae This process is located between anterior and posterior surfaces on lateral aspect of the bone; directed superiorly and laterally to articulate with the Zygomatic bone.
Describe the location and articulation point of the frontal process of maxillae process that is a superiorly directed plate on the anterior surface; articulates with the frontal bone.
Describe the location and articulation point of the palatine process of maxillae Horizontal plate directed medially; articulates with opposite side to form anterior 2/3 – ¾ of the hard palate
Describe the location and articulation point of the alveolar process of maxillae Inferiorly directed process that contains the teeth
What structure do the nasal bones form? The bridge of the nose is formed by these bones
Where do the nasal bones lie with respect to the frontal process of maxillae? These bones lie medially to the frontal processes of the maxillae
What bone(s)do the nasal bones articulate with? These bones articulate with the frontal bone, maxillae, and other bones of the nose
Where are the palatine bones located? Bones located at the back of the nasal cavity
What structures do the palatine bones contribute to? Contribute to the posterior floor and lateral wall of the nasal cavity, posterior ¼ of the hard palate, and floor of the orbits
What is the Posterior Nasal Spine? Posterior directed projection of the palatine bones; a landmark for x-rays.
Describe the defining feature of the lacrimal bones and their location They are the smallest of the facial bones; they form part of the medial wall of the orbital cavity
Zygomatic Arch formed by? Formed by zygomatic process of maxillae and temporal bones
What are the four processes of the zygomatic bones [MOFT] Maxillary, Orbital, Frontosphenoidal, Temporal
The Inferior Nasal Conchae makes up most of what area? makes up most of the inferior part of the lateral nasal walls.
What are the articulation points of the Inferior Nasal Conchae? Articulates anteriorly with the maxillae and posteriorly with the palatine bones
Describe the location of the vomer Inferior half of the bony nasal septum
What are the articulation points of the vomer? Articulates inferiorly with the maxillae and palatine bones; Anterior border articulates with the cartilaginous septum of the nose
What are the bones that comprise the cranial skeleton? [EFPOTS] Ethmoid, Frontal, Parietal, Occipital, Temporal, Sphenoid
How many bones does the ethmoid articulate with? Articulates with 15 bones (all facial the bones + frontal & sphenoid): frontal, sphenoid, nasals, lacrimals, vomer, palatines, inferior nasal Conchae, zygomatics, maxillae
What parts of the facial structure does the ethmoid bone contribute to? Contributes to the orbits and nasal cavities
What are the parts of the ethmoid bone? Cribiform Plate, Crista Galli, Labyrinth, Conchae
Describe the cribiform plate of the ethmoid bone and its location Horizontal plates that separate cranial and nasal cavities; forms roof of the nasal cavities
Describe the crista galli of the ethmoid bone and its location Superior projection from Cribiform plate; triangular process that separates the cranial hemisphere
Describe the ethmoid labyrinth of the ethmoid bone Portion of ethmoid bone: thin walled, with variable air pockets
Describe the ethmoid conchae and the facial structure formed by them Medial surface of the Ethmoid labyrinth; comprised of two lateral plates that house the superior and medial nasal Conchae; forms the lateral walls of the nasal cavity
What portion of the brain case is formed by the frontal bone? Forms the anterior part of the brain case
What structures does the frontal bone contribute to? Consists of a vertical plate (forehead) and horizontal aspect that contributes to the roof of the orbit and nasal cavities
What is the ethmoid notch? Midline notch of the frontal bone that articulates with the ethmoid bone
Describe the location and articulation point of the zygomatic process of maxillae Process lateral to the orbital surfaces for articulation with zygomatic bone
What are the structures of the frontal bone? ethmoid notch, zygomatic process, frontal spine, supraorbital rim
What is the name of the suture at which the two parietal bones articulate? Sagittal suture is articulation point for these bones
What is the name of the suture at which the two parietal bones articulate with the frontal bone? Articulates with the frontal bone at the coronal suture
Which portion(s) of the cranium is/are formed by the occipital bone? This bone forms the inferior and posterior portions of the cranium
Which cranial bone articulates with the parietal bones at the lamboid suture? The occipital bone articulates with the parietal bones at this suture
What is the location and purpose of the foramen magnum? This large opening is located in the occipital bone at base of skull; opening for the spinal cord
Where are the lateral condyles located, and what is their function? Located on either side of the foramen magnum; for articulation with C1
What portion(s) of the cranium is/are formed by the temporal bones? These bones form the lateral base and some of the sides of the cranium
What are the 3 portions of the temporal bone? Squamous portion, petrous portion and tympanic portion
The zygomatic process extends from which portion of the Temporal bone? The squamous portion of the temporal bone includes this long bony process
Describe the location of the squamous portion of the temporal bone. located at lateral, anterior, and superior aspects of temporal bone
What bony process does the zygomatic process of the temporal bone articulate with? articulates with the temporal process of the zygomatic bone
Describe the location and key features of the petrous portion of the temporal bone. Located at the base of the skull; houses essential organs of hearing and balance; also includes the mastoid process – point of muscle attachment.
Describe the location of the tympanic portion of the temporal bone. Temporal bone portion located anterior to the mastoid process and inferior to the squamous and petrous portions of temporal bone.
Describe the key features of the tympanic portion of the temporal bone. This temporal bone portion forms part of the external auditory canal & includes the styloid process.
What are the articulation points of the sphenoid bone? Complex cranial bone that articulates with all the bones of the cranial skeleton and three bones of the facial skeleton: vomer, palatines, and zygomatics.
What are the parts of the sphenoid bone? body, greater wings, lesser wings, pterygoid processes
The body of the sphenoid forms the posterior wall of which cavity? the body of this bone forms the posterior wall of the nasal cavity
The lesser wings of the sphenoid bone contribute to what facial feature? Portion of sphenoid bone that contributes to the inferior wall of the orbits
The greater wings of the sphenoid bone contribute to what facial feature? This bony feature forms posterior ½ of the lateral orbital wall.
Function of the Pterygoid Processes? For attachment of Pterygoid muscles.
Pterygoid Processes composed of? Lateral and Medial Pterygoid
What are the cavities of the vocal tract? [BONP] buccal, oral, nasal, pharynx
What are the extents of the buccal cavity? Small space that is limited by the lips and cheeks externally and by the gums and teeth internally
What are the boundaries of the oral cavity? Cavity bound anteriorly and laterally by the teeth and alveolar processes; superiorly by the hard and soft palates; posteriorly by the anterior faucial pillars; inferiorly by the floor of the mouth
What are the boundaries of the nasal cavity? Divided sagittally by the bony and cartilaginous nasal septum; bound anteriorly by the nares; inferiorly by the floor of the nose (roof of the mouth); posteriorly by the nasopharyngeal wall
What is the function of the nasal conchae? increases surface area of lateral nasal wall
Description and location of the pharynx? Musculomembranous tube that courses from the base of the skull to the bottom of the cricoid cartilage.
What are the parts of the pharynx? Nasopharynx, Oropharynx, Laryngopharynx
Location of the nasopharynx? Portion of pharynx located above the soft palate
Extents of oropharynx? This portion of pharynx extends from soft palate to the hyoid bone
Extents of laryngopharynx? This portion of pharynx extends from hyoid to the esophagus
Created by: wyhanes