orientation the language of anatomy
TRANSCRIPT
ORIENTATION
The Language of Anatomy
Anatomy- study of the structure of body parts
• Gross / Macroscopic
• Regional:
• Systemic:
• Microscopic
• Cytology- anatomy of cells
• Histology- anatomy of tissues
Physiology- study of the function of the structural parts
• Operations of organ systems and between cells:
• involves chemistry and physics
• chemical concentrations, electrical currents, pressures, movements
The Principle of Complimentarity
Function always reflects structure-
“Form follows Function”
Structural Organization- levels
• Atoms• Molecules• Cells• Tissues• Organs• Organ Systems• Organism
Functions of Life
• Maintain Boundries
• Movement
• Response to Stimuli
• Digestion
• Metabolism
• Excretion
• Reproduction
• Growth
To Maintain Life:
• Nutrients
• Oxygen
• Water
• Normal Body Temperature
• Atmospheric Pressure
Homeostasis
• The ability to maintain a relatively stable internal condition as external conditions change
Homeostasis is controlled primarily by the Endocrine and Nervous
systems
• Stimuli --> Receptor
• --> Afferent Pathway
• --> Control Center
• -->Efferent Pathway
• --> Effector
Feedback Control
• Negative Feedback
• effector turns stimuli off
• Positive Feedback
• effector makes stimuli stronger
Anatomical Position
• Body erect, limbs extended
• palms facing forward
• feet together
Surfaces of Body
• Front = anterior or ventral surface
• Back = posterior or dorsal surface
• Side = lateral surface
Planes (Cuts / Sections)
• Sagittal• Mid Sagittal -
• plane divides body into equal right and left halves
• Parasagittal-
• plane parallel to mid- sagittal plane (unequal halves)
Transverse / Horizontal
• Divides body into upper and lower parts,
• superior and inferior
• same as horizontal
Frontal (Coronal)
• Divides body into anterior and posterior parts
POSITION
• Lateral = toward side
• Medial = toward mid-line
• Superior = above (towards head)
• Inferior = below (towards tail)
• Proximal = near beginning of limb
• Distal = near end of limb
• Superficial = near surface
• Deep = deep to surface
Cavities
• Lined by membranes:
• Membrane against cavity wall = parietal
• Membrane against organ = visceral
Dorsal Cavity
• Cranial
• Spinal (vertebral)
Ventral Cavity
• Thoracic Cavity:
• Pericardial
• Pleural
• Abdominopelvic Cavity:
• Abdominal
• Pelvic
Quadrants
• The abdominopelvic cavity is divided into quadrants (4)
• Upper Right Upper Left
• Lower Right Lower Left
Regions
Righthypochondriac Epigastric
Lefthypochondriac
RightLumbar Umbilical
LeftLumbar
RightIliac Hypogastric
LeftIliac
Radiography
• X-Rays- short electromagnetic waves
• Dense structures absorb x-rays = light
• Fat, Hollow, areas absorb less = dark
Radiography
• CT- computerized tomography
• forms a dime thin transverse section
• eliminates images of overlapping structures
Radiography
• DSR- dynamic spatial reconstruction
• 3-D image
• shows organ movement and volume
• DSA- used to ID blockages
• also called angiography
Radiography
• PET- Positron Emission Topography
• tagged molecules are absorbed by the most active brain cells
• gives a live action picture of brain activity
• used for stroke, epilepsy, Alzheimer’s
Sonography
• Ultrasound- uses sound waves, echo
• little value at examining air filled structures
• safe, cheap
Magnetic Resonance Images
• Subjects the body to magnetic fields up to 60,000X stronger than the earth’s magnetic field (can be dangerous)
• Makes H2 molecules spin enhancing their energy
• translates into a high contrast image of soft tissue
MRI
• Good for soft tissue (the most H2O)
• can see difference between fatty white matter and gray matter
• can see nerves in spinal cord
• dense skull does not appear
• detects tumors and degenerative disease