Positioning 1- Chapter 3 General anatomy and radiographic positioning terminology Flashcards
What is Osteology?
Osteology is the detailed study of the body of knowledge related to the bones of the body.
What are the four fundamental body planes?
Sagittal
Coronal
Horizontal
Oblique
Describe the Sagittal plane
A sagittal plane divides the entire body or a body part into right and left segments. The plane passes vertically through the body from front to back. The midsagittal plane is a specific sagittal plane that passes through the midline of the body and divides it into equal right and left halves
Describe the coronal plane
A coronal plane divides the entire body or a body part into anterior and posterior segments. The plane passes through the body vertically from one side to the other. The midcoronal plane is a specific coronal plane that passes through the midline of the body, dividing it into equal anterior and posterior halves . This plane is sometimes referred to as the midaxillary plane.
Describe the horizontal plane
A horizontal plane passes crosswise through the body or a body part at right angles to the longitudinal axis. It is positioned at a right angle to the sagittal and coronal planes. This plane divides the body into superior and inferior portions. Often it is referred to as a transverse, axial, or cross-sectional plane.
Describe the oblique plane
An oblique plane can pass through a body part at any angle among the three previously described planes. Planes are used in radiographic positioning to center a body part to the image receptor (IR) or central ray and to ensure that the body part is properly oriented and aligned with the IR. The midsagittal plane may be centered and perpendicular to the IR, with the long axis of the IR parallel to the same plane. Planes can also be used to guide projections of the central ray. The central ray for an anteroposterior (AP) projection passes through the body part parallel to the sagittal plane and perpendicular to the coronal plane. Quality imaging requires attention to all relationships among body planes, the IR, and the central ray.
Body planes are used in computed tomography (CT), magnetic resonance imaging (MRI), and ultrasound (US) to identify the orientation of anatomic cuts or slices shown in the procedure. Imaging in several planes is often used to show large sections of anatomy.
Two special planes are used in radiographic positioning. These planes are localized to a specific area of the body only. What are these special planes?
Interilliac
Occlusal
Describe the Interiliac plane
The interiliac plane transects the pelvis at the top of the iliac crests at the level of the fourth lumbar spinous process. It is used in positioning the lumbar spine, sacrum, and coccyx.
Describe the Occlusal Plane
The occlusal plane is formed by the biting surfaces of the upper and lower teeth with the jaws closed. It is used in positioning of the odontoid process and in some head projections.
What are the two great cavities of the torso?
The thoracic and the abdominal
The thoracic cavity is subdivided into…
A pericardial segment and two pleural portions
Although the abdominal cavity has no intervening partition, the lower portion is called the…
Pelvic cavity
Abdominal and pelvic cavities together are referred to as the abdominopelvic cavity
What are the principle structures located in the thoracic cavity?
- pleural Membranes
- Lungs
- trachea
- esophagus
- Pericardium
- heart and great vessels
What are the principle structures in the Abdominal cavity?
- Peritoneum
- liver
- gallbladder
- Pancreas
- Spleen
- Stomach
- intestines
- Kidneys
- Ureters
- Major Blood Vessels
- Pelvic Portion: rectum, urinary bladder, and parts of the reproductive system
What are the four clinical divisions(quadrants) of the abdomen?
- Right upper quadrant (RUQ)
- Right lower Quadrant (RLQ)
- Left lower Quadrant (LUQ)
- Left lower quadrant (LLQ)
What are the nine regions of the abdomen?
Superior
• Right hypochondrium
• Epigastrium
• Left Hypochaondrium
Middle
• Right lateral
• Umbilical
• Left Lateral
Inferior
• Right inguinal
• Hypogastrium
• Left Inguinal
What is anatomy?
The term applied to the science of the structure of the body
What is physiology?
The study of the function of the body organs
The Saginaw plane divides the body into…
Right and left segments, passing vertically from front to back
Midsagital plane(MSP) is a specific sagittal plane that…
Passes through midline and divides the body into equal right and left halves
Coronal planes pass through the body..
Vertically from side to side, dividing the body into anterior and posterior parts
Mid coronal plane(MCP), also called midaxillary plane, is the specific plane that…
Passes through midline and divides the body into equal anterior and posterior halves
Horizontal planes pass…
Crosswise through the body or body part at right angles to the longitudinal axis
- positioned at right angle to sagittal and coronal planes
- divides the body into superior and inferior portions
- also called transverse, axial, or cross-sectional planes
Oblique planes pass through a body part…
At any angle between the sagittal, coronal, or horizontal planes
Interiliac plane transects the body at…
The top of the iliac crests (level of L4)
Occlusal plane formed by the…
Biting surfaces of the upper and lower teeth with jaws closed
What are the divisions of the abdomen?
• Bordered superiorly by diaphragm • bordered inferiority by superior pelvic aperture(pelvic inlet) • abdomen divided in two methods -quadrants -regions
Which body plane passes through the body from anterior to posterior and divides the body into equal rights and left halves?
A. Midsagittal
B. Midcoronal
C. Midaxillary
D. Midtransverse
A. Midsagittal
In which quadrant of the abdomen is the largest portion of the liver located?
A. Right upper
B. Left upper
C. Right lower
D. Left lower
A. Right upper
The detailed study of the body of knowledge relating to the bones of the body defines?
A. Anatomy
B. Arthrology
C. Osteology
D. Pathology
C. Osteology
What is body habitus?
Defined as the common variations in the shape of the human body
Important in radiography because habitus determines size, shape, and position of organs of the thoracic and abdominal cavities
What organs are affected by body habitus?
- heart
- lungs
- diaphragm
- stomach
- colon
- gallbladder
What are the four types of body habitus?
- sthenic =50%
- hyposthenic = 35%
- asthenic = 10%
- hypersthenic = 5%
Sthenic and hyposthenic are considered average
Hypersthenic and asthenic are the extremes
Osteology covers…
- skeletal divisions
- general bone features
- bone development
- classification of bones
Bone functions
- attachment for muscles
- mechanical basis for movement
- protection of internal organs
- support frame for body
- storage for calcium, phosphorus, and other salts
- production of red and white blood cells
Skeletal divisions
• total of 206 bones in the body
• divided into two main groups
- axial skeleton (80 bones)
- appendicular skeleton (126 bones)
• axial skeleton supports and protects the head and trunk
• appendicular skeleton provides means for movement
What is the function of the axial skeleton?
Supports and protects the head and trunk
What is the function of the appendicular skeleton?
Provides means for movement
General bone features
• Compact bone
- strong dense outer layer
• Spongy bone
- inner, less dense layer
- contains a speculated network called trabeculae
• Trabeculae filled with red and yellow marrow
• Red marrow produces red and white blood cells
• yellow marrow stores fat cells
• Medullary cavity
- central cavity of long bones
- contains trabeculae filled with yellow marrow
- red marrow found in ends of long bones
• periosteum
- tough, fibrous connective tissue that covers bone, except at articulate ends
• endosteum
- lines marrow cavity
Describe compact bone
Strong, dense outer layer
Describe spongy bone
Inner less dense layer that contains a spiculated network called trabeculae
Trabeculae is filled with…
Red and yellow marrow
Red marrow produces…
Red and white blood cells
Yellow marrow stores
Fat cells
Describe the medullary cavity
The central cavity of long bones that contains trabeculae filled with yellow marrow.
Red marrow is found in the ends of long bones
Red marrow is found…
In the ends of long bones
What is the periosteum?
Tough fibrous connective tissue that covers bone, except at articulate ends
What is the endosteum?
Lines marrow cavity
What are the bone classifications?
- long
- short
- flat
- irregular
- sesamoid
Describe long bones
Found only in limbs
Consist of body and two enlarged articulate ends
Example: femur and humerus
Describe short bones
Consist mainly of cancellous bone with a thin outer layer of compact bone
Example: carpal bones
Describe flat bones
Consist of two plates of compact bones
Middle layer of cancellous bone called diploe
Examples: sternum and cranium
Describe irregular bones
Are peculiarly shaped
Examples: vertebrae and facial bones
Describe sesamoid bones
Very small and oval
Develop inside and beside tendons
Protect the tendon from excessive wear
Largest is patella
Which of the following is an example of a flat bone?
A. Femur
B. Radius
C. Clavicle
D. Scapula
D. Scapula
All of the following are functions of the skeleton, except:
A. Attachment for muscles
B. Storage for calcium, phosphorus, and other salts
C. Production of minerals
D. Production of red and white blood cells
C. Production of minerals
Which of the following can be palpated to locate T7?
A. Jugular notch
B. Sternal angle
C. Inferior angle of the scapula
D. Xiphoid process
C. Inferior angle of the scapula
What is arthrology?
Defined as the study of joints, or articulation so between bones
Classified in two ways
• functional
• structural
What are the three subdivisions of the functional classification in arthrology?
- synarthroses = immoveable
- amphiarthroses = slightly moveable
- diarthroses = freely moveable
What are the three distinct groups in the structural classification of Arthrology based on connective tissues?
- fibrous
- cartilaginous
- synovial
Describe synovial joints
• permit wide range of motion; freely moveable • complex joints • enclosed by articulate capsule • many have accessory soft tissues - meniscus - bursae
What are the six types of synovial joints?
- gliding
- hinge
- pivot
- ellipsoid
- saddle
- ball and socket
Describe the gliding joint
- simplest synovial joint
* examples: intercarpal and intertarsal joints
Describe the hinge joint
- permits flex ion and extension only
* examples: elbow and knee
Describe the pivot joint
- allows rotation around single axis
* example: atlantoaxial joint (C1-C2 joint)
Describe the ellipsoid joint
- allows flex ion, abdusction, adduction, and circumduction
* example: radiocarpal (wrist) joint
Describe the saddle joint
- allows movement similar to ellipsoid
- difference is in the shape of the articular surfaces
- example: carpometacarpal joint between trapezium and first metacarpal
Describe the ball and socket joint
- permits widest range of motion
* examples: hip and shoulder
Which of the following joint classifications is freely moveable?
A. Amphiarthroses
B. Synarthroses
C. Diarthroses
D. Synovial
C. Diarthroses
Bone markings and features
• Processes and projections - extend beyond and project out from the main body of a bone • depressions - hallow or depressed areas • fractures - a break in the bone
Processes and projections
Condyle
Rounded process at an articular end
Processes and projections
Caracoid or coronoid
Beaklike or crownlike process
Processes and projections
Crest
Ridgelike process
Processes and projections
Epicondyle
Projection above a condyle
Processes and projections
Facet
Small, smooth-surfaced articular process
Processes and projections
Hamulus
Hook-shaped process
Processes and projections
Head
Expanded end of a long bone
Processes and projections
Horn
Hornlike process
Processes and projections
Line
Linear elevation’ not as prominent as a crest
Processes and projections
Malleolus
Club-shaped process
Processes and projections
Protuberance
Projecting prominence
Processes and projections
Spine
Sharp process
Processes and projections
Styloid
Long, pointed process
Processes and projections
Trochanter
Either of the two large, rounded, and elevated processes of the proximal femur
Processes and projections
Tubercle
Small ,rounded, and elevated process
Processes and projections
Tuberosity
Large, rounded, and elevated process
Depressions
Fissure
Cleft or deep groove
Depressions
Foramen
Hole in a bone for transmission of vessels and nerves
Depressions
Fossa
Pit, fovea, or hollow space
Depressions
Groove
Shallow linear channel
Depressions
Meatus
Tubelike passageway
Depressions
Notch
Indentation in the border of a bone
Depressions
Sinus
Recess, groove, cavity, or hallow space
Depressions
Sulcus
Furrow or trench
What types of fractures are there
- closed
- open
- nondisplaced
- displaced
Common classifications of fractures
- compression
- compound (open)
- simple
- greenstick
- transverse
- spiral or oblique
- comminuted
- impacted
Many fractures fall into more than one category
Which of the following is defined as a hole in a bone for transmission of blood vessels and nerves?
A. Fissure
B. Groove
C. Sinus
D. Foramen
D. Foramen
Anterior (ventral)
Forward or front part of the body or of a part
Posterior (dorsal)
Back part of body or part
Caudad
Parts away from the head of the body
Cephalad
Parts toward the head
Superior
Nearer the head or situated above
Inferior
Nearer the feet or situated below
Central
Mid area or main part of an organ
Peripheral
At or near the surface, edge, or outside of another body part
Medial
Toward the median plane of the body or toward the middle of a body part
Lateral
Away from the median plane or away from the middle of a part
Superficial
Near the skin or surface
Deep
Far from the surface
Distal
Farthest from the point of attachment or origin
Proximal
Nearer to the point of attachment or origin
External
Outside the body or part
Internal
Inside the body or part
Parietal
The wall or lining of a body cavity
Visceral
The covering of an organ