Page 222 - Ultimate Visual Dictionary (DK)

THE HUMAN BODY

Skull

THE SKULL is the most complicated bony structure
of the body but every feature serves a purpose. RIGHT SIDE VIEW OF
A FETAL SKULL
Internally, the main hollow chamber of the skull
has three levels that support the brain, with
every bump and hollow corresponding to the Anterior fontanelle
shape of the brain. Underneath and toward Parietal
the back of the skull is a large round hole, the bone Coronal suture
foramen magnum, through which the spinal
cord passes. To the front of this are many smaller openings
through which nerves, arteries, and veins pass to and from the
Frontal
brain. The roof of the skull is formed from four thin, curved bones bone
that are firmly fixed together from the age of about two years. At
the front of the skull are the two orbits, which contain the eyeballs,
Nasal bone
and a central hole for the airway of the nose. The jaw bone hinges
on either side at ear level.

Mental
Lambdoid symphysis
RIGHT SIDE VIEW OF SKULL suture
Frontal bone
Coronal suture Occipital bone
Greater wing of
sphenoid bone Frontozygomatic Sphenoidal
suture Mastoid fontanelle
Parietal bone fontanelle External
Supraorbital margin auditory
Squamous meatus
suture Orbital
cavity VIEW OF SKULL FROM BELOW
External occipital crest
Nasal bone
Foramen magnum
Anterior nasal spine
Maxilla Occipital condyle
Lambdoid (upper jaw)
suture
Carotid canal
Occipital bone Mandible
(lower
jaw) Mastoid process
Temporal bone
External Pharyngeal
auditory meatus Styloid process tubercle
Condyle
Mastoid process Zygomatic Zygomatic arch Pterygoid plate
Coronoid bone
process
Posterior border Pterygoid hamulus
Mental foramen of vomer
Greater palatine
Concha foramen

Mandible (lower jaw) Posterior nasal aperture

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