CHAPTER 7 - Axial Skeleton Flashcards
of bones in average adult skeleton
206
Total # of Skull bones
22
Skull bones are divided into two groups:
- Cranial (braincase)
2. Facial (structure of face)
Name the 8 Cranial bones
1 - Frontal 2 - Parietals 2 - Temporals 1 - Occipital 1 - Sphenoid 1 - Ethmoid
Name the 14 Facial bones
2 - Zygomatic 2 - Lacrimal 2 - Palatine 2 - Nasal 2 - Inf Nasal Conchae 2 - Maxillae 1 - Mandible 1 - Vomer
The PARIETAL bones are joined to the OCCIPITAL bone by the ___ ___.
Lambdoid Suture
The PARIETAL bones are joined to the TEMPORAL bones by the __ __.
Squamous Suture
The PARIETAL bones are joined at midline by the
Sagittal Suture
The PARIETAL bones are connected to the FRONTAL bone by the __ __.
Coronal Suture
The Lambdoid Suture joins which bones
Parietals - Occipital
The Squamous Suture joins which bones
Parietal - Temporal
The Sagittal Suture joins which bones
Parietals
The Coronal Suture connects the Parietal bones to ___
the Frontal bone
The __ __ __ can be felt through the scalp, at the base of the head.
It is the site of attachment of the Ligamentum Nuchae.
External Occipital Protuberance
A set of small ridges the extend laterally from the protuberance; the point of attachment for several neck muscles.
nuchal lines
The large hole of the Temporal bone.
Transmits sound waves toward the eardrum.
External Acoustic/Auditory Meatus
A large projection.
Posterior and inferior to the auditory meatus.
(seen and felt as a prominent lump, posterior to the ear)
Mastoid Process
Which of the Cranial bones are paired?
Parietals
Temporals
How many wings does the Sphenoid have?
4 (2 greater, 2 lesser)
What are the legs of the Sphenoid called?
Pterygoid Processes (Medial / Lateral)
*(Project Inferiorly from where Body & Greater Wings unite)
What structure forms around the Pituitary gland?
Sella Turcica
The lateral surface of the Sphenoid bone is (anterior/posterior) to the Temporal bone.
anterior
T/F:
The Spenoid bone is a single bone that extends completely across the skull
True
The cheekbone is also known as __
Zygomatic bone
The Zygomatic bone is (anterior/posterior) to the Sphenoid bone
anterior
The Zygomatic Arch consist of joined processes from the __ and __ bones
Temporal bone (Zygomatic process) Zygomatic bone (Temporal process)
Upper Jaw
Maxilla
Maxillae, pl.
Lower Jaw
Mandible
Anterior to the Zygomatic bone is the __
Maxilla
The Mandible consists of 2 main parts:
- Body
2. Ramus
The Body and Ramus of the Mandible join at the __
Angle
- Located at the superior end of the Ramus.
* Articulates with the Temporal bone, allowing movement of the Mandible
Mandibular Condyle
The __ __ is the attachment of the temporalis muscle to the mandible.
Coronoid Process
The depression between the Mandibular Condyle and the Coronoid Process
Mandibular Notch
The Maxillae and Mandible have __ Processes with sockets for the attachment of the teeth.
Alveolar Processes
Two prominent cavities of the Skull
- Orbits
2. Nasal Cavity
The Orbit has several openings (for communication with other cavities). The largest of these are the __ and __
Superior Orbital Fissure
Inferior Orbital Fissure
CANALS:
- Optic nerve passes through the __ canal and enters the __ cavity.
- __ canal contains a duct that carries tears to the __ cavity.
- Optic nerve passes through the OPTIC CANAL and enters the CRANIAL cavity.
- NASOLACRIMAL CANAL contains a duct that carries tears into the NASAL cavity.
The __ __ divides the nasal cavity into right and left halves.
Nasal Septum
Superior part of the Nasal Septum
Perpendicular Plate of the Ethmoid
Inferior part of the Nasal Septum
Vomer
The lateral wall of the nasal cavity has 3 bony shelves called the __ __
nasal conchae
Which of the 3 conchae are separate from the other two:
a) Superior Nasal Concha
b) Middle Nasal Concha
c) Inferior Nasal Concha
c) Inferior Nasal Concha
The Middle and Superior Nasal Conchae are projections from the __ bone.
Ethmoid bone
Air-filled cavities on each side of the Ethmoid
Ethmoidal Sinuses (interconnect to form the ethmoidal labyrinth)
The brain and spinal cord are connected through the __ __, which is located in the __ __.
- foramen magnum
- located in the Occipital bone