(1) Anatomy - Skull - Cranium Bones

The skull is composed of 2 groups of bones (joined together by sutures): __*___ and ____*__

cranium and facial

Sutures are immovable ____ joints

fibrous

Sutures - Coronal

Sutures - Sagittal

Sutures - Lambdoid

Sutures - Squamous

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How many bones does the cranium have? List them

8

Frontal bone (1)

Parietal bone (2)

Temporal bone (2)

Occipital bone (1)

Sphenoid bone (1)

Ethmoid bone (1)

Frontal Bone (1)

frontal bone (from coronal suture to above the eyebrow bone)

How many landmarks does the Frontal bone have? Name them

2

Supraorbital foramen/notch

Glabella

Frontal Bone - Supraorbital foramen/notch

notch above the eye

Frontal Bone - Glabella

smooth area between the eyebrows

Parietal bone (2)

left and right hemisphere of skull

Temporal bone (2)

How many landmarks does the temporal bone have? Name them

8

External acoustic/auditory meatus

Internal acoustic/auditory meatus

Zygomatic process of the temporal bone

Mastoid process

Styloid process

Mandibular fossa

Carotid canal

Jugular foramen

Temporal Bone - External acoustic/auditory meatus

passageway that leads from the outside of the head to the tympanic membrane, or eardrum membrane, of each ear.

Temporal Bone - Internal acoustic/auditory meatus

passageway that guides sound waves to the tympanic membrane (ear drum) - like the external one, basically just the inside part of the same tube.

Temporal Bone - Zygomatic process of the temporal bone

(not the entire thing to the front of the face, just 75 and stops at 4

Temporal Bone - Mastoid Process

serves for the attachment of many head muscles.

Temporal Bone - Styloid process

little pick

Temporal Bone - Styloid process

little pick

Temporal Bone - Mandibular fossa

where the mandible attaches

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depression that articulates with the mandibular condyles of the mandible. Together, it forms the TMJ (temporomandibular joint)

Temporal Bone - Carotid canal

passageway for a blood vessel called the internal carotid artery (which supplies blood to the brain)

Temporal Bone - Jugular foramen

passageway for the jugular vein (blood vessel) which drains blood from the vein (irregular shaped hole)

Occipital bone (1)

How many landmarks does the Occipital bone have? List them

3

Occipital condyle

Foramen magnum

Hypoglossal canal

Occipital bone - Occipital condyle

the rounded occipital condyles articulate with the atlas vertebrae (C1) allowing the head to move up, down, side to side (NOT THE BIG HOLE), the two bones on the sides of the hole

Occipital bone - Foramen magnum

that’s the big hole

Occipital bone - Hypoglossal canal

nerve goes through tongue and passes through here, one hole on each occipital condyle

Sphenoid Bone (1)

embedded inside of the skull

How many landmarks does the Sphenoid Bone have? List them

7

Greater wing

Lesser wing

Sella turcica

Optic canal

Foramen rotundum

==Foramen== ovale

Foramen spinosum

Sphenoid Bone - Greater wing

Sphenoid Bone - Lesser wing

Sphenoid Bone - Sella turcica

depression in the sphenoid bone that protects and houses the pituitary gland

Sphenoid Bone - Optic canal

round hole in each posterior orbit. It is a passageway for the optic nerve which carries visual information to the brain

Sphenoid Bone - Foramen rotundum (ROS)

hole in the sphenoid bone that allows nerves & arteries pass through

Sphenoid Bone - Foramen ovale (ROS)

hole in the sphenoid bone that allows nerves & arteries pass through

Sphenoid Bone - Foramen spinosum (ROS)

hole in the sphenoid bone that allows nerves & arteries pass through

Ethmoid bone (1)

How many landmarks does the Ethmoid bone have? List them

5 1/2

Perpendicular plate

Superior nasal concha

Middle nasal concha

Crista galli

Cribriform plate

\--Olfactory foramina

Ethmoid bone - Perpendicular plate

Ethmoid bone - Superior nasal concha

Ethmoid bone - Middle nasal concha

Ethmoid bone - Crista galli

fish fin that sticks out into the skull

Ethmoid bone - Cribriform plate

those 2 plates on the side with the holes

Ethmoid bone - Cribriform plate - Olfactory foramina

small holes in the cribriform plate that allow olfactory nerves to pass through the skull form the nasal cavity into the olfactory bulbs within the skull