Chapter 7: The axial skeleton; skull bones and general questions about the region Flashcards
How many bones are in the axial skeleton?
includes 80 bones and associated joints in the axial skeleton
how many parts of the axial skeleton are there?
The 3 main parts are the skull, vertebral column (pelvic girdle and lower limbs extend from), thoracic cage/thorax (pectoral girdle and upper limbs extend from).
How many skull bones are there?
22 bones
What are the 2 main groups of skull bones?
Cranial bones and facial bones
Frontal lobe bone
Largely makes up the forehead; coronal suture
Parietal bone
upper sides of the head; sagittal suture joins parietal bones
What is the squamous suture?
joins the parietals to the temporals
what is the lambdoid suture?
joints parietals to occipital
occipital bone
lower back of skull; occipital condyles join with vertebral column
What is the foramen magnum?
where the brain and spinal cord meet; largest opening of the skull
what is the external occipital protuberance?
Where the trapezius muscle attaches to the skull
Temporal bones
lower sides of the skull
external has acoustic meatus where sound vibrations pass through
Mastoid process
sternocleidomastoid muscle attaches
mandibular fossa
condylar process of mandible joins here
Jugular foramen
intrajugular vein and some cranial nerves go through here
Sphenoid bone
shaped like flying animal
sella turcica, pituitary gland sits in a depression here
there are greater and lesser wings in the sphenoid bone
ethmoid bone
extends from the cranial cavity down to nasal cavities
What is the marking related to the ethmoid bone?
the cribriform plate. it has openings in it for nerves that are for the sense of smell
