skull morphology and topography

chapter 11

skull of average shape is termed _______________

mesocephalic skull

mesocephalic skull width of head is:

75-80% of length

mesocephalic is how many degrees:

47 degrees

short, broad head is termed:

brachycephalic

brachycephalic width is _____ or more of length

80%

brachycephalic is approximately:

54 degrees, anything above 47 degrees

long, narrow head is termed:

dolichocephalic

dolichocephalic width is less than ____ of length

75%

dolichocephalic is approximately

40 degrees, anything less than 47 degrees

AML

line from opening of ear to acantion

LML

line from opening of ear to lips

MML

line from opening of ear to mental point

GML

line from opening of ear to glabella

OML

line from opening of ear to outer eye

IMOL

line from opening of ear to cheek bone

glabellaoalveolar line

line that skims bony parts of face, excludes nose

5 common positioning errors:

1. rotation

2. tilt

3. excessive flexion

4. excessive extension

5. incorrect CR angle