Back Osteology Flashcards
Bone classifications
Long Short Flat Irregular Sesamoid Sutural/Wormian bones
Long bones
Humerus/femur
Short bones
Tarsals/carpals
Short bone shape
Cuboidal
Flat bones
Squamous Skull
Irregular bones
Facial bones
Sesamoid bones
Patella
Embedded in tendon
Sutural/Wormian bones
Amid skull sutures in the neurocranium
Parts of the long bones
Epiphysis Epiphyseal plate Metaphysis Diaphysis Epiphysial line
Epiphysis
Portion of the bone furthest from the center
Epiphyseal plate
Cartilaginous region between epiphysis and metaphysis
Metaphysis
Flared region between diaphysis and epiphyseal plate
Diaphysis
Central portion of a bone
Epiphyseal line
Region b/w metaphysis and epiphysis after cessation of ossification
Compact bone
Outermost solid layer of long bones
What is cancellous/Spongy bone
Innermost sinusoidal layer of long bones
Fxn of Medullary/Marrow Cavity
Replaces some of the cancellous bone layer in adults
Parts of the posterior basicranium
Temporal bone (paired) Occipital bone (unpaired)
Parts of the Temporal bone
Squamous part (head) Petrous part (head) Mastoid part Tympanic part (head)
Parts of the Mastoid
Mastoid process Mastoid foramen Styloid process Stylomastoid foramen Mastoid notch Mandibular fossa
Fxn of Mastoid process
Multiple muscular attachments
Fxn of Mastoid foramen
Transmits Mastoid Emissary Vein and Meningeal branch of Occipital Artery
What is the origin of the styloid muscles and ligament?
Styloid process
The mastoid notch is medial to what?
Mastoid process
What does the mandibular fossa articulate with?
Condylar process of mandible at the temporomandibular joint
Parts of the Occipital bone
Internal and External Squamous parts
Internal and external basilar parts
Parts of the External Squamous Part
External Occipital Protuberance/Inion
Superior Nuchal Line
Inferior Nuchal Line
External Occipital Crest
The Superior Nuchal Line laterally extends from what?
The External Occipital Protuberance
What is inferior to the Superior Nuchal Line?
The Inferior Nuchal Line
Parts of the External Basilar part?
Pharyngeal Tubercle
Occipital Condyle
Condylar Canal
What is the insertion point for the Superior Pharyngeal Constrictor muscle?
Pharyngeal tubercle
Pharyngeal tubercle
Central
Anterior to Foramen Magnum
Protrudes inferiorly
Is the Occipital Condyle paired or unpaired?
Paired on either side of Foramen Magnum
What does the Occipital Condyle pair with?
Superior Articulating process of C1 Atlas
Where is the Condylar Canal in reference to the Occipital Condyle?
Posterolateral
How many cervical vertebrae?
7
Where are the C. Vertebrae located?
B/w the occipital bone and thoracic vertebrae
C1 is also called what?
Atlas (Holds up the world)
Fovea for Odontoid Process is located Ant. or Pos. on the atlas?
Anterior
Parts of the C1 Vertebrae
Anterior Arch
Posterior Arch
Lateral Mass
Parts of the Anterior Arch of the Atlas
Fovea for the Odontoid process
Facet for the Odontoid process
Anterior tubercle
Parts of the Posterior arch
Groove for the Vertebral artery
Posterior tubercle
The posterior tubercle of the Atlas is analogous to what?
Spinous process of regular vertebrae
Parts of the lateral mass
Tubercle for the transverse ligament
Superior articulating process
Inferior articulating process
Transverse Process
The tubercle for the transverse ligament is the origin and contralateral insertion for what?
Transverse band of the Cruciform ligament
What does the superior articulating process articulate with?
The occipital condyles
What does the inferior articulating process articulate with?
C2 (Axis)
What is located within the Transverse Process and what does it transmit?
Transverse Foramen transmits the Vertebral artery
Where is the fracture of a Jeffersonian Fracture?
Arches of the Atlas
Will a Jeffersonian fracture injure the spinal cord?
No, unless the transverse ligament is ruptured
Main feature of the C2 Vertebra
Odontoid Process
Cause of Jefferson Fracture
Blow to the top of the head (falling object or diving accident)
Where are the two areas that the Axis is susceptible to fracture?
Odontoid process
Vertebral arch
Hangman’s Fracture occurs from what?
Hyperextension of the head, fracture of the vertebral arch
Where is the fracture on an Odontoid Process that will allow it to heal?
Inferior to the base
What are the features of a typical C. Vertebra (C3-6)?
Vertebral Body Vertebral Foramen Vertebral Arch Spinous process Transverse Process Superior Articulating Process Inferior Articulating Process
Vertebral Body
Small and wide, superior surface concave, inferior surface convex
What does the Vertebral Foramen transmit?
Spinal cord
Two features of the vertebral arch
Pedicle
Lamina
Spina Bifida arises because of a developmental abnormality in what?
Vertebral Lamina fail to fuse and close off the vertebral canal
Spina Bifida commonly occurs at which vertebrae?
L5 and S1
What is a typical sign of benign spina bifida?
Tuft of hair over the defect
What is the appearance of the Spinous Process?
Short and bifid
What are the parts of the transverse process?
Transverse foramen
Posterior tubercle
Anterior tubercle
Costotransverse bar
Function of the Transverse Foramen
C1-6 transmit the Vertebral A.
Attachment points for levator scapulae and scalene muscles
Anterior and Posterior Tubercles
Fxn of the costotransverse bar
Lateral boundary of the Transverse foramen
Links the Costal and Transverse elements of the Transverse Process
Possesses a depressed area that accomodates the Anterior Rami of Spinal Nerves
What does the Superior Articulating process articulate with?
The Inferior Articulating Process of the vertebral setment above
What is the main feature of the Vertebra Prominens?
Long and well-pronounced Spinous Process
Will a dislocation in the C. Vertebrae cause injury to the spinal cord?
No
How many Thoracic Vertebrae?
12
What is the function of the Thoracic Vertebrae?
Attachment for the ribs
The ___ of each rib articulates with the ___ of the thoracic vertebral body above the rib number and the ____ of the vertebral body of the same number
Head, Inferior costal demifacet, superior costal demifacet
Parts of the typical rib (3-9)
Head
Neck
Tubercle
Body (shaft)
What does the head of the rib articulate with?
Thoracic Vertebrae
Parts of the rib head
Superior and Inferior Articular facets
Crest of the head
Fxn of the Superior Articular Facet?
Articulates with inferior Costal Demifacet on Thoracic Vertebral Body one numeric segment superiorly
Fxn of the Inferior Articular Facet
Articulates with Superior Costal Demifacet on Thoracic Vertebral of the same numeric segment
Fxn of the crest of the head of the ribs
Separates the two articular facets
What is the stretch of the bone b/w the head and tubercle of the ribs?
Neck
What does the articular facet of the rib tubercle articulate with?
Transverse Costal Facets on Thoracic Vertebrae
What attaches to the nonarticular part of the rib tubercle?
Lateral Costotransverse Ligament
What are the two parts of the rib body?
Costal Groove
Costal Angle
What houses the Intercostal nerve and vessels?
Costal Groove
What is the anterolateral Turning point of the rib called?
Costal angle
What is name of the disease that involves calcification of the edges of the Vertebral body?
Spondylosis
What does spondylosis cause?
Localized pain and stiffness
Separation of the Vertebral Arch from the Vertebral Body is called what?
Spondylolysis
Anterior displacement of the Vertebral Body on the Inferior Vertebral Segment is known as _____.
Spondylolisthesis
How many Lumbar Vertebrae?
5
What does the Vertebral Foramen of the Lumbar Vertebrae transmit?
Spinal Cord
Conus Medullaris
Cauda Equina
What attaches to the Accessory Process of the Transverse Process of the Lumbar Vertebrae?
Intertransversarii muscles
What is unique to the superior articulating process of the lumbar vertebrae?
Mamillary Process
What attaches to the Mamillary process?
Multifidi muscles and Intertransversarii muscles
Narrowing of the lumbar vertebral foramen is called what?
Lumbar Spinal Stenosis
Where are lumbar punctures performed on the spine?
L3/L4 or L4/L5
What type of vertebrae is the Sacrum composed of?
5 fused vertebrae
Parts of the Sacrum
Base Dorsal Surface Ventral surface Sacral Canal Apex
Features of the Dorsal Sacrum
Rough and convex Median Sacral Crest Medial Sacral Crest Lateral Sacral Crest Sacral Tuberosity Posterior (Dorsal) Sacral Foramina Sacral Hiatus Sacral Cornua
Features of the Ventral Sacrum
4x Transverse Lines
Anterior Sacral Foramina
What does the Anterior Sacral Foramina transmit?
Anterior Ramus of Sacral Spinal nerves
What does the Apex of the sacrum articulate with/
Coccyx
Parts of the Coccyx
Coccygeal Cornua
Transverse Process
Tip
Curvature of the Thoracic spine
Kyphosis
Curvature of the Lumbar spine
Lordosis