Head Flashcards
Consists of the brain, its protective coverings and the ears and face
Head
The skeleton of the head
Cranium
In anatomical position the cranium is oriented so that the inferior margin of the orbit and the superior margin of the external acoustic meatus of both sides lie in the same horizontal plane
Orbitomeatal plane (Frankfort horizontal plane)
Bony case of the brain and tis membranous covering, the cranial meninges. Also contains the proximal parts of the cranial nerves and the vasculature of the brain
Neurocranium
Dome-like roof of the neurocranium
Calvaria (skullcap)
Floor of the neurocranium
Cranial base
How many bones make up the neurocranium and what are they?
Eight. Frontal, ethmoid, sphenoid, occipital, pair of temporal and pair of parietal
Forms the anterior part of the cranium and consists of bones surrounding the mouth, nose and most of the orbits
Viscerocranium
How many bones make up the viscerocranium and what are they?
Fifteen. Mandible, ethmoid, vomer pair of maxilla, pair of inferior nasal concha, pair of zygomatic, pair of palatine, pair of nasal and pair of lacrimal bones
What bone forms the forehead
Frontal bone
What bone forms the prominence of the cheeks
Zygomatic bones
Anterior nasal opening of the cranium
Piriform aperture
What bone forms the upper jaw
Maxillae
“U” shaped bone forming the lower jaw
Mandible
Horizontal portion of the Mandible
Body
Vertical portion of the Mandible
Ramus
Roughly “H” shaped formation of sutures that unite the frontal, parietal, sphenoid and temporal bones
Pterion
What 4 bones form the calvaria
Frontal bone, right and left parietal bone and occipital bone posteriorly
This suture unites the frontal and parietal bones
Coronal suture
This suture unites the right and left parietal bones
Sagittal suture
This suture unites the occipital bone with the right and left parietal and temporal bones
Lamboid suture
Landmark formed by the intersection of the sagittal and coronal sutures
Bregma
The superiormost point of the cranium, near the midpoint of the sagittal suture
Vertex
External aspect of the cranial base
Basicranium
What three large depressions lie in the cranial base?
Anterior, middle and posterior cranial fossae
What are the layers of the scalp
S=Skin
C=Connective Tissue
A=Aponeurosis
L=Loose connective tissue
P=Pericranium
What are the layers of the cranial meninges?
Dura mater, Arachnoid mater, Pia mater
The ____ mater is separated from the ___ mater by the subarachnoid space, which contains _____.
Arachnoid, pia, cerebrospinal fluid
What are the layers of dura mater?
Periosteal layer and meningeal layer
What are the four dural infoldings
Falx cerebri, tentorium cerebelli, falx cerebelli and diaphragma sellae
The endothelial-lined spaces between the periosteal and meningeal layers of the dura
Dural venous sinuses
Tufted prolongations of the arachnoid that protrude through the meningeal layer of the dura mater in to the dural venous sinuses and lateral venous lacunae. They transfer CSF to the venous system
Arachnoid granulations
Of the three meningeal spaces Dura-cranium interface, dura-arachnoid junction and subarachnoid space which ones exists as a space in the absence of pathology?
Subarachnoid space
The other two require trauma/blood in order to be present
The brain is composed of
Cerebrum, cerebellum and brainstem
Folds
Gyri
Grooves
Sulci
Clefts
Fissures
What are the lobes of the cerebrum?
Frontal, parietal, occipital and temporal
Composed of the epithalamus, thalamus and hypothalamus. Forms the central core of the brain
Diencephalon
Rostral part of the brainstem, lies at the junction of the middle and posterior cranial fossae CN III and IV
Midbrain
Part of the brainstem b/w the midbrain rostrally and the medulla oblongata caudally, lies in the anterior part of the posterior cranial fossa. CN V
Pons
Most caudal part of the brainstem continuous with the spinal cord and les in the posterior cranial fossa. CN IX, X and XII
Medulla oblongata
Air-filled cavities found in some cranial and facial bones. They reduce weight of the skull and increase intensity of the voice
Paranasal Sinuses
Forms the forehead, roof of the nasal cavity and roofs of the orbits
Frontal bone
Form side walls and roof of cranium
Parietal
Forms back of the skull and base of cranium
Occipital
From side walls and floor of cranium
Temporal
Forms parts of base of cranium, sides of skull and floors and sides of orbits
Sphenoid
Forms parts of roof and walls of nasal cavity, floor of cranium and walls of orbits
Ethmoid
Form upper jaw, anterior roof of mouth, floors of orbits and sides and floor of nasal cavity
Maxilla
From posterior roof of mouth and floor and lateral walls of nasal cavity
Palatine
From prominences of cheeks and lateral walls and floors of orbits
Zygomatic
Form part of medial walls of orbits
Lacrimal
Form bridge of nose
Nasal
Forms inferior portions of nasal septum
Volmer
Extend into the nasal cavity from its lateral walls
Inferior nasal conchia
Forms lower jaw
Mandible
Roof of neurocranium
Calvaria
Floor of neurocranium
Basicranium
Which bone contains the frontal sinuses
Frontal bone
Which suture joins the 2 parietal bones
Sagittal suture
Which suture joins parietal bones and frontal bones
Coronal suture
Which bone contains the foramen magnum
Occipital bone
Which suture forms a junction with occipital bone and parietal bones
Lambdoid suture
Helps with cheek prominence and zygomatic arch
Zygomatic process
Leads to inner portions of ear
External acoustic meatus
This holds the pituitary gland
Sella turcica
Which bone contains the sphenoid sinuses
Sphenoid sinuses
This contain openings for axons of olfactory neurons
Cribriform plates
Forms the main portion of nasal septum
Perpendicular plate
Support mucous membranes of nasal cavity
Superior and middle nasal conchae
Which bone contains the ethomoidal sinusees
Ethmoid bone